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Showing papers by "Boston College published in 2007"


Book
17 Dec 2007
TL;DR: The authors Constructing Narratives for Research Thematic Analysis Structural Analysis Dialogic Performance Analysis Visual Analysis Truths and Cautions Truths, Caution, and Caution: Looking Back, Looking Forward
Abstract: Looking Back, Looking Forward Constructing Narratives for Research Thematic Analysis Structural Analysis Dialogic Performance Analysis Visual Analysis Truths and Cautions

4,770 citations


Journal ArticleDOI
TL;DR: In this article, the ability to achieve a simultaneous increase in the power factor and a decrease in the thermal conductivity of the same nanocomposite sample and for transport in the same direction is discussed.
Abstract: Many of the recent advances in enhancing the thermoelectric figure of merit are linked to nanoscale phenomena found both in bulk samples containing nanoscale constituents and in nanoscale samples themselves. Prior theoretical and experimental proof-of-principle studies on quantum-well superlattice and quantum-wire samples have now evolved into studies on bulk samples containing nanostructured constituents prepared by chemical or physical approaches. In this Review, nanostructural composites are shown to exhibit nanostructures and properties that show promise for thermoelectric applications, thus bringing together low-dimensional and bulk materials for thermoelectric applications. Particular emphasis is given in this Review to the ability to achieve 1) a simultaneous increase in the power factor and a decrease in the thermal conductivity in the same nanocomposite sample and for transport in the same direction and 2) lower values of the thermal conductivity in these nanocomposites as compared to alloy samples of the same chemical composition. The outlook for future research directions for nanocomposite thermoelectric materials is also discussed.

3,562 citations


Journal ArticleDOI
TL;DR: The motivation for internationalization include commercial advantage, knowledge and language acquisition, enhancing the curriculum with international content, and many others as discussed by the authors, which is the context of economic and academic trends that are part of the reality of the 21st century.
Abstract: Globalization and internationalization are related but not the same thing. Globalization is the context of economic and academic trends that are part of the reality of the 21st century. Internationalization includes the policies and practices undertaken by academic systems and institutions—and even individuals—to cope with the global academic environment. The motivations for internationalization include commercial advantage, knowledge and language acquisition, enhancing the curriculum with international content, and many others. Specific initiatives such as branch campuses, cross-border collaborative arrangements, programs for international students, establishing English-medium programs and degrees, and others have been put into place as part of internationalization. Efforts to monitor international initiatives and ensure quality are integral to the international higher education environment.

2,755 citations


Journal ArticleDOI
TL;DR: A detailed discussion of the strengths and limitations of the AMS measurement approach is presented and how the measurements are used to characterize particle properties are reviewed to highlight the different applications of this instrument.
Abstract: The application of mass spectrometric techniques to the realtime measurement and characterization of aerosols represents a significant advance in the field of atmospheric science. This review focuses on the aerosol mass spectrometer (AMS), an instrument designed and developed at Aerodyne Research, Inc. (ARI) that is the most widely used thermal vaporization AMS. The AMS uses aerodynamic lens inlet technology together with thermal vaporization and electron-impact mass spectrometry to measure the real-time non-refractory (NR) chemical speciation and mass loading as a function of particle size of fine aerosol particles with aerodynamic diameters between similar to 50 and 1,000 nm. The original AMS utilizes a quadrupole mass spectrometer (Q) with electron impact (EI) ionization and produces ensemble average data of particle properties. Later versions employ time-of-flight (ToF) mass spectrometers and can produce full mass spectral data for single particles. This manuscript presents a detailed discussion of the strengths and limitations of the AMS measurement approach and reviews how the measurements are used to characterize particle properties. Results from selected laboratory experiments and field measurement campaigns are also presented to highlight the different applications of this instrument. Recent instrumental developments, such as the incorporation of softer ionization techniques (vacuum ultraviolet (VUV) photo-ionization, Li(+) ion, and electron attachment) and high-resolution ToF mass spectrometers, that yield more detailed information about the organic aerosol component are also described. (c) 2007 Wiley Periodicals, Inc.

1,545 citations


Journal ArticleDOI
TL;DR: This chapter outlines an emerging scientific agenda for understanding what experiences of emotion feel like and how they arise, and the role of such experiences in the economy of the mind and behavior.
Abstract: Experiences of emotion are content-rich events that emerge at the level of psychological description, but must be causally constituted by neurobiological processes. This chapter outlines an emerging scientific agenda for understanding what these experiences feel like and how they arise. We review the available answers to what is felt (i.e., the content that makes up an experience of emotion) and how neurobiological processes instantiate these properties of experience. These answers are then integrated into a broad framework that describes, in psychological terms, how the experience of emotion emerges from more basic processes. We then discuss the role of such experiences in the economy of the mind and behavior.

1,140 citations


Journal ArticleDOI
TL;DR: In this paper, the authors extend their 2003 paper on instrumental variables and generalized method of moments estimation, and test and describe enhanced routines that address heteroskedasticity- and autocorrelation-consistency.
Abstract: We extend our 2003 paper on instrumental variables and generalized method of moments estimation, and we test and describe enhanced routines that address heteroskedasticity- and autocorrelation-cons...

928 citations


Journal ArticleDOI
TL;DR: Polycrystalline BiFeO3 nanoparticles (size 80-120 nm) are prepared by a simple sol-gel technique as discussed by the authors, which are very efficient for photocatalytic decomposition of organic contaminants under irradiation from ultraviolet to visible frequencies.
Abstract: Polycrystalline BiFeO3 nanoparticles (size 80-120 nm) are prepared by a simple sol-gel technique. Such nanoparticles are very efficient for photocatalytic decomposition of organic contaminants under irradiation from ultraviolet to visible frequencies. The BiFeO3 nanoparticles also demonstrate weak ferromagnetism of about 0.06 mu(B)/Fe at room temperature, in good agreement with theoretical calculations.

819 citations


Journal ArticleDOI
08 Nov 2007-Nature
TL;DR: The full potential of olefin metathesis will be realized only when additional catalysts are discovered that are truly practical and afford exceptional selectivity for a significantly broader range of reactions.
Abstract: Catalytic olefin metathesis--through which pairs of C = C bonds are reorganized--transforms simple molecules to those that are complex and precious. This class of reactions has noticeably enriched chemical synthesis, which is the art of preparing scarce molecules with highly desirable properties (for example, medicinal agents or polymeric materials). Research in the past two decades has yielded structurally well-defined catalysts for olefin metathesis that are used to synthesize an array of molecules with unprecedented efficiency. Nonetheless, the full potential of olefin metathesis will be realized only when additional catalysts are discovered that are truly practical and afford exceptional selectivity for a significantly broader range of reactions.

819 citations


Journal ArticleDOI
TL;DR: In this article, the authors present a model of how institutional pressures at the community level shape corporate social action, behaviors and practices that extend beyond immediate profit maximization goals and are intended to increase social benefits or mitigate social problems for constituency external to the firm.
Abstract: We present a model of how institutional pressures at the community level shape corporate social action—behaviors and practices that extend beyond immediate profit maximization goals and are intended to increase social benefits or mitigate social problems for constituencies external to the firm—within the metropolitan area where firms are headquartered. We propose that community isomorphism influences the nature and level of corporate social action within communities and conclude with theoretical implications emphasizing the community as the focal unit of analysis for understanding corporate social action.

695 citations


Journal ArticleDOI
Monique Valcour1
TL;DR: Results encourage greater research attention to work characteristics, such as job complexity and control over work time, and skills that represent resources useful to the successful integration of work and family demands.
Abstract: This study reports an investigation of the relationships of work hours, job complexity, and control over work time to satisfaction with work-family balance. Based on data from a sample of 570 telephone call center representatives, a moderated hierarchical regression analysis revealed that work hours were negatively related to satisfaction with work-family balance, consistent with the resource drain perspective. Job complexity and control over work time were positively associated with satisfaction with work-family balance. Control over work time moderated the relationship such that as work hours rose, workers with low control experienced a decline in work-family balance satisfaction, while workers with high control did not. Results encourage greater research attention to work characteristics, such as job complexity and control over work time, and skills that represent resources useful to the successful integration of work and family demands.

545 citations


Journal ArticleDOI
TL;DR: The findings support previous research which has found that traditional masculine gender socialization and social norms models encourage men to put their health at risk, and suggest directions for health promotion efforts when working with men.

Journal ArticleDOI
TL;DR: In this article, the authors presented the results of an investigation of the sequence of events from the Sun to the Earth that ultimately led to the 88 major geomagnetic storms (defined by minimum Dst �� 100 nT) that occurred during 1996-2005.
Abstract: [1] We present the results of an investigation of the sequence of events from the Sun to the Earth that ultimately led to the 88 major geomagnetic storms (defined by minimum Dst �� 100 nT) that occurred during 1996–2005. The results are achieved through cooperative efforts that originated at the Living with a Star (LWS) Coordinated DataAnalysis Workshop (CDAW) held at George Mason University in March 2005. On the basis of careful examination of the complete array of solar and in situ solar wind observations, we have identified and characterized, for each major geomagnetic storm, the overall solar-interplanetary (solar-IP) source type, the time, velocity, and angular width of the source coronal mass ejection (CME), the type and heliographic location of the solar source region, the structure of the transient solar wind flow with the storm-driving component specified, the arrival time of shock/disturbance, and the start and ending times of the corresponding IP CME (ICME). The storm-driving component, which possesses a prolonged and enhanced southward magnetic field (Bs), may be an ICME, the sheath of shocked plasma (SH) upstream of an ICME, a corotating interaction region (CIR), or a combination of these structures. We classify the Solar-IP sources into three broad types: (1) S-type, in which the storm is associated with a single ICME and a single CME at the Sun; (2) M-type, in which the storm is associated with a complex solar wind flow produced by multiple interacting ICMEs arising from multiple halo CMEs launched from the Sun in a short period; (3) C-type, in which the storm is associated with a CIR formed at the leading edge of a high-speed stream originating from a solar coronal hole (CH). For the 88 major storms, the S-type, M-type, and C-type events number 53 (60%), 24 (27%), and 11 (13%), respectively. For the 85 events for which the surface source regions could be investigated, 54 (63%) of the storms originated in solar active regions, 11 (13%) in quiet Sun regions associated with quiescent filaments or filament channels, and 11 (13%) were associated with coronal holes. Remarkably, nine (11%) CME-driven events showed no sign of eruptive features on the surface or in the low corona (e.g., no flare, no coronal dimming, and no loop arcade, etc.), even though all the available solar observations in a suitable time period were carefully examined. Thus while it is generally true that a major geomagnetic storm is more likely to be driven by a frontside fast halo CME associated with a major flare, our study indicates a broad distribution of source properties. The implications of the results for space weather forecasting are briefly discussed.

Posted Content
TL;DR: The ownership concentration of U.S. firms is similar to and by some measures more concentrated than the ownership of firms in other countries as discussed by the authors, and 96% of these firms have blockholders; these blockholders in aggregate own an average 39% of the common stock.
Abstract: This paper offers evidence on the ownership concentration at a representative sample of U.S. public firms. 96% of these firms have blockholders; these blockholders in aggregate own an average 39% of the common stock. The ownership of U.S. firms is similar to and by some measures more concentrated than the ownership of firms in other countries. These findings challenge current thinking on a number of issues, ranging from the nature of the agency conflict in domestic corporations to the relationship between ownership concentration and legal protections for investors around the world.

Journal ArticleDOI
TL;DR: In this article, the authors estimate latent factor models of liquidity, aggregated across various liquidity measures, and find that across-measure systematic liquidity is a priced factor while within-mean systematic liquidity does not exhibit additional pricing information, and there is some evidence that liquidity, as a characteristic of assets, is priced in the cross-section.
Abstract: We estimate latent factor models of liquidity, aggregated across various liquidity measures. Shocks to assets' liquidity have a common component across measures which accounts for most of the explained variation in individual liquidity measures. We find that across-measure systematic liquidity is a priced factor while within-measure systematic liquidity does not exhibit additional pricing information. Controlling for across-measure systematic liquidity risk, there is some evidence that liquidity, as a characteristic of assets, is priced in the cross-section. Our results are robust to the inclusion of other equity characteristics and risk factors, such as market capitalization, book-to-market, and momentum.

Journal ArticleDOI
TL;DR: The authors examined the relation between institutional investor involvement in and the operating performance of large firms and found a significant relation between a firm's operating cash flow returns and both the percent of institutional stock ownership and the number of institutional shareholders.
Abstract: This paper examines the relation between institutional investor involvement in and the operating performance of large firms. We find a significant relation between a firm’s operating cash flow returns and both the percent of institutional stock ownership and the number of institutional stockholders. However, this relation is found only for a subset of institutional investors: those less likely to have a business relationship with the firm. These results suggest that institutional investors with potential business relations with the firms in which they invest are compromised as monitors of the firm.

Journal ArticleDOI
TL;DR: It is suggested that language functions as a context in emotion perception and how a linguistically relative approach to emotion perception allows for intriguing and generative questions about the extent to which language shapes the sensory processing involved in seeing emotion in another person's face.

Journal ArticleDOI
TL;DR: In this paper, the authors explore the CSR disclosure practices of a size-and industry-stratified sample of publicly-traded U.S. firms and identify industry effects in terms of content, emphasis, and reporting format choices.
Abstract: Corporate social responsibility (CSR) is an expanding area of activity for managers and academics. Increases in consumer demand for fair trade goods and growth in assets under professional management and invested with a social responsibility focus are driving demands for information not provided through traditional financial statements and analyses. At the same time, mainstream institutional investors have encouraged incorporation of environmental, social, and governance information into equity analysis. The majority of research in this area has been performed on European and Australian firms. We expand on this literature by exploring the CSR disclosure practices of a size- and industry-stratified sample of publicly-traded U.S. firms. We perform a content analysis on the public information portfolio provided by these firms during 2004. CSR activity was disclosed by most of the sample and was included in nearly half of public disclosures made by the firms during 2004. Of particular emphasis are community matters, health and safety, diversity and human resources matters, and environmental programs. Primary venues of disclosure are mass media releases such as corporate websites and press releases, followed closely by mandatory filings. Consistent with prior research, we identify industry effects in terms of content, emphasis, and reporting format choices. However, we offer only mixed evidence on the existence of a size effect. Disclosure frequency and emphasis is significantly different for the largest one-fifth of the firms, but not for the remainder of the sample. There are, however, identifiable size-effects with respect to reporting format choice. Primary trends are that the use of websites is increasing in firm size, while the use of mandatory filings is decreasing in firm size. Finally, and also consistent with prior literature, we document a generally self-laudatory tone in the content of CSR disclosures for the sample firms.

Journal ArticleDOI
TL;DR: There are important differences between the WHO and CDC charts that vary by age group, growth indicator, and specific Z-score curve and the growth performance of healthy breast-fed infants according to both are evaluated.
Abstract: The evaluation of child growth trajectories and the interventions designed to improve child health are highly dependent on the growth charts used. The U.S. CDC and the WHO, in May 2000 and April 2006, respectively, released new growth charts to replace the 1977 NCHS reference. The WHO charts are based for the first time on a prescriptive, prospective, international sample of infants selected to represent optimum growth. This article compares the WHO and CDC curves and evaluates the growth performance of healthy breast-fed infants according to both. As expected, there are important differences between the WHO and CDC charts that vary by age group, growth indicator, and specific Z-score curve. Differences are particularly important during infancy, which is likely due to differences in study design and characteristics of the sample, such as type of feeding. Overall, the CDC charts reflect a heavier, and somewhat shorter, sample than the WHO sample. This results in lower rates of undernutrition (except during the first 6 mo of life) and higher rates of overweight and obesity when based on the WHO standards. Healthy breast-fed infants track along the WHO standard's weight-for-age mean Z-score while appearing to falter on the CDC chart from 2 mo onwards. Shorter measurement intervals in the WHO standards result in a better tool for monitoring the rapid and changing rate of growth in early infancy. Their adoption would have important implications for the assessment of lactation performance and the adequacy of infant feeding and would bring coherence between the tools used to assess growth and U.S. national guidelines that recommend breast-feeding as the optimal source of nutrition during infancy.

Journal ArticleDOI
TL;DR: In this paper, the authors examine the effect of managerial ownership on financial reporting conservatism and find that as managerial ownership declines, the severity of agency problem increases, increasing the demand for conservatism.
Abstract: In this paper we examine the effect of managerial ownership on financial reporting conservatism. Separation of ownership and control gives rise to agency problems between managers and shareholders. Financial reporting conservatism is one potential mechanism to address these agency problems. We hypothesize that as managerial ownership declines, the severity of agency problem increases, increasing the demand for conservatism. Consistent with our hypothesis, we find that conservatism as measured by the asymmetric timeliness of earnings declines with managerial ownership. The negative association between managerial ownership and asymmetric timeliness of earnings is robust to various controls for the investment opportunity set. We thus provide evidence of a demand for conservatism from the firm's shareholders.

Journal ArticleDOI
TL;DR: Using a longitudinal and multimethod design, the authors show that implicit theories of emotion, as distinct from intelligence, are linked to both emotional and social adjustment during the transition to college.
Abstract: The authors demonstrate that people differ systematically in their implicit theories of emotion: Some view emotions as fixed (entity theorists), whereas others view emotions as more malleable (incremental theorists). Using a longitudinal and multimethod design, the authors show that implicit theories of emotion, as distinct from intelligence, are linked to both emotional and social adjustment during the transition to college. Before entering college, individuals who held entity (vs. incremental) theories of emotion had lower emotion regulation self-efficacy and made less use of cognitive reappraisal (Part 1). Throughout their first academic term, entity theorists of emotion had less favorable emotion experiences and received decreasing social support from their new friends, as evidenced by weekly diaries (Part 2). By the end of freshman year, entity theorists of emotion had lower well-being, greater depressive symptoms, and lower social adjustment as indicated in both self- and peer-reports (Part 3). The emotional, but not the social, outcomes were partially mediated by individual differences in emotion regulation self-efficacy (Part 4). Together, these studies demonstrate that implicit theories of emotion can have important long-term implications for socioemotional functioning.

Journal ArticleDOI
TL;DR: It has been widely established that depressed mood states and clinical depression, as well as a range of other psychiatric disorders, are associated with a relative difficulty in accessing specific autobiographical information in response to emotion-related cue words on an Autobiographical Memory Test (AMT).
Abstract: It has been widely established that depressed mood states and clinical depression, as well as a range of other psychiatric disorders, are associated with a relative difficulty in accessing specific autobiographical information in response to emotion-related cue words on an Autobiographical Memory Test (AMT; J. M. G. Williams & K. Broadbent, 1986). In 8 studies the authors examined the extent to which this relationship is a function of impaired executive control associated with these mood states and clinical disorders. Studies 1–4 demonstrated that performance on the AMT is associated with performance on measures of executive control, independent of depressed mood. Furthermore, Study 1 showed that executive control (as measured by verbal fluency) mediated the relationship between both depressed mood and a clinical diagnosis of eating disorder and AMT performance. Using a stratified sample in Study 5, the authors confirmed the positive association between depressed mood and impaired performance on the AMT. Studies 6–8 involved experimental manipulations of the parameters of the AMT designed to further indicate that reduced executive control is to a significant extent driving the relationship between depressed mood and AMT performance. The potential role of executive control in accounting for other aspects of the AMT literature is discussed.

Journal ArticleDOI
TL;DR: In this paper, a new conceptualization of dispersion as a continuous, multidimensional construct, in which each dimension is theoretically linked with different outcomes, is presented, with a series of examples from real dispersed teams and present implications for research regarding technology use.
Abstract: As organizations operate across greater distances, scholars are increasingly interested in the work of geographically dispersed teams and the technologies that they use to communicate and coordinate their work. However, research has generally not specified the dimensions (spatial, temporal, or configurational) and degrees of team dispersion, nor has it articulated the theoretical connections between those dimensions and important team outcomes. This research essay expands upon previous field and lab studies of dispersed teamwork by presenting a new conceptualization of dispersion as a continuous, multidimensional construct, in which each dimension is theoretically linked with different outcomes. We illustrate this new conceptualization with a series of examples from real dispersed teams and present implications for research regarding technology use.

Journal ArticleDOI
TL;DR: It is found that each of these IT-enabled learning mechanisms enable capabilities that have a distinct effect on the exploration and exploitation learning dynamics in the organization, and this effect is dependent on organizational and environmental conditions.
Abstract: This study investigates the effects of information technology (IT) on exploration and exploitation in organizational learning (OL). We use qualitative evidence from previously published case studies of a single organization to extend an earlier computational model of organizational learning (March 1991) by introducing IT-enabled learning mechanisms: communication technology (e-mail), knowledge repositories of best practices, and groupware. We find that each of these IT-enabled learning mechanisms enable capabilities that have a distinct effect on the exploration and exploitation learning dynamics in the organization. We also find that this effect is dependent on organizational and environmental conditions, as well as on the interaction effects between the various mechanisms when used in combination with one another. We explore the implications of our results for the use of IT to support organizational learning.

Journal ArticleDOI
Jean M. Bartunek1
TL;DR: In this paper, the authors examine how management science researchers and academics might more fruitfully collaborate with actual managers, and the two groups are separated by, among many other things, the language they use.
Abstract: The article examines how management science researchers and academics might more fruitfully collaborate with actual managers. The two groups are separated by, among many other things, the language ...

Journal ArticleDOI
TL;DR: Understanding the differences between affect and cognition will require systematic study of how the phenomenological distinction characterising the two comes about, and why such a distinction is functional.
Abstract: In this paper, we suggest that affect meets the traditional definition of “cognition” such that the affect–cognition distinction is phenomenological, rather than ontological. We review how the affect–cognition distinction is not respected in the human brain, and discuss the neural mechanisms by which affect influences sensory processing. As a result of this sensory modulation, affect performs several basic “cognitive” functions. Affect appears to be necessary for normal conscious experience, language fluency, and memory. Finally, we suggest that understanding the differences between affect and cognition will require systematic study of how the phenomenological distinction characterising the two comes about, and why such a distinction is functional.

Journal ArticleDOI
TL;DR: Results indicated that managerial oversight and abusive supervision significantly influenced counterproductivity in the following periods, whereas ethical leadership did not.
Abstract: The authors studied the effect of 3 modes of managerial influence (managerial oversight, ethical leadership, and abusive supervision) on counterproductivity, which was conceptualized as a unit-level outcome that reflects the existence of a variety of intentional and unintentional harmful employee behaviors in the unit Counterproductivity was represented by an objective measure of food loss in a longitudinal study of 265 restaurants After prior food loss and alternative explanations (eg, turnover, training, neighborhood income) were controlled for, results indicated that managerial oversight and abusive supervision significantly influenced counterproductivity in the following periods, whereas ethical leadership did not Counterproductivity was also found to be negatively related to both restaurant profitability and customer satisfaction in the same period and to mediate indirect relationships between managerial influences and distal unit outcomes

Journal ArticleDOI
TL;DR: In this article, the SERVCON scale, a comprehensive instrument for measuring service convenience, is presented, which is based on a second-order, five-dimensional construct that reflects consumers' perceived time and effort in purchasing or using a service.
Abstract: As customers have demanded greater convenience in service exchanges, researchers have responded by incorporating the convenience construct into their conceptual models and empirical studies, but a comprehensive, formally validated measure of convenience remains lacking This study conceptualizes service convenience as a second-order, five-dimensional construct that reflects consumers’ perceived time and effort in purchasing or using a service Service convenience dimensions are salient at different stages of the purchase decision process Given this conceptualization, the study presents the development and validation of the SERVCON scale, a comprehensive instrument for measuring service convenience The five dimensions are independent within a nomological network that illustrates distinct antecedent and consequent effects, and the results reinforce the multidimensional representation, offering insight into the distinctive relationships between each service convenience dimension and its antecedents, such as competitive intensity, and consequences, such as repurchase behavior The findings help researchers and managers understand a fully conceptualized convenience construct and facilitate the measurement of convenience in future empirical studies

Journal ArticleDOI
TL;DR: In this paper, the authors reported continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves.
Abstract: Dropwise condensation can enhance heat transfer by an order of magnitude compared to film condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid removal of condensate drops; however, such promotion has not been reported on engineered surfaces. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves. On such micro-/nanostructured surfaces, the condensate drops prefer the Cassie state which is thermodynamically more stable than the Wenzel state. With a hexadecanethiol coating, superhydrophobicity is retained during and after condensation and rapid drop removal is enabled.


Journal ArticleDOI
TL;DR: The frequency dependent effective complex dielectric functions are extracted from the experimental data and, in combination with simulations to determine the surface current density and local electric field, provide considerable insight into the electromagnetic response of the planar metamaterials.
Abstract: Planar electric split ring resonator (eSRR) metamaterials and their corresponding inverse structures are designed and characterized computationally and experimentally utilizing finite element modeling and THz time domain spectroscopy. A complementary response is observed in transmission. Specifically, for the eSRRs a decrease in transmission is observed at resonance whereas the inverse structures display an increase in transmission. The frequency dependent effective complex dielectric functions are extracted from the experimental data and, in combination with simulations to determine the surface current density and local electric field,provide considerable insight into the electromagnetic response of our planar metamaterials. These structures may find applications in the construction of various THz filters, transparent THz windows, or THz grid structures ideal for constructing THz switching/modulation devices.