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Author

P. Haring Bolivar

Other affiliations: Folkwang University of the Arts
Bio: P. Haring Bolivar is an academic researcher from University of Siegen. The author has contributed to research in topics: Terahertz radiation & Responsivity. The author has an hindex of 11, co-authored 47 publications receiving 1273 citations. Previous affiliations of P. Haring Bolivar include Folkwang University of the Arts.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a promising approach for the label-free analysis of DNA molecules using direct probing of the binding state of DNA with electromagnetic waves at THz frequencies is reported, which provides a drastically enhanced sensitivity enabling analysis down to femtomol levels.
Abstract: We report on a promising approach for the label-free analysis of DNA molecules using direct probing of the binding state of DNA with electromagnetic waves at THz frequencies. Passive THz resonator devices based on planar waveguides are used as sample carriers and transducers for THz transmission analysis. In comparison to a formerly used free-space detection scheme, this method provides a drastically enhanced sensitivity enabling analysis down to femtomol levels. We examine the potential of our approach on biologically relevant DNA samples and demonstrate the detection of single base mutations on DNA molecules.

521 citations

Journal ArticleDOI
TL;DR: Time-resolved terahertz transmission analysis of polynucleotides demonstrates a strong dependence of the complex refractive index on the binding state (hybridized/denatured) of deoxyribonucleic acid (DNA) molecules, which can be inferred by monitoring THz transients and hence identify polyn nucleotides by detecting the binding of unknown polyn DNA sequences to known probe molecules.
Abstract: We present a promising approach for the label-free characterization of genetic material. Time-resolved terahertz (THz) transmission analysis of polynucleotides demonstrate a strong dependence of the complex refractive index on the binding state (hybridized/denatured) of deoxyribonucleic acid (DNA) molecules. By monitoring THz transients, one can thus infer the binding state of oligo- and polynucleotides, and hence identify polynucleotides by detecting the binding of unknown polynucleotide DNA sequences to known probe molecules. A broadband experimental demonstration in a free-space configuration, as well as a discussion of the potential application for next generation gene chips is presented.

409 citations

Journal ArticleDOI
TL;DR: In this article, the authors demonstrate the feasibility of low-frequency active plasmonics using semiconductors and show experimentally that the Bragg scattering of terahertz SPPs on a semiconductor grating can be modified by thermal excitation of free carriers.
Abstract: A major challenge in the development of surface plasmon optics or plasmonics is the active control of the propagation of surface plasmon polaritons (SPPs). Here, we demonstrate the feasibility of low-frequency active plasmonics using semiconductors. We show experimentally that the Bragg scattering of terahertz SPPs on a semiconductor grating can be modified by thermal excitation of free carriers. The transmission of SPPs through the grating at certain frequencies can be switched completely by changing the temperature less than 100°C. This semiconductor switch provides a basis for the development of low-frequency surface-plasmon optical devices.

130 citations

Journal ArticleDOI
TL;DR: In this paper, a modular approach in a parallel-plate configuration using separate components for signal generation, biosensing transducer and signal detection is demonstrated, which allows coupling modular components with a high positioning tolerance and broadband matching with minimal losses.
Abstract: In this work, a new THz-device configuration for biosensing applications is demonstrated. A modular approach in a parallel-plate configuration using separate components for signal generation, biosensing transducer and signal detection is demonstrated. The low-cost disposable biosensing transducer is based on metallized periodic groove structures as high-Q photonic band gap resonators. Photoconductively activated slot launchers are used as signal generators and detectors of THz parallel-plate waves. In comparison to the former planar strip line approaches, this modular concept provides a cost-efficient solution given the exchangeability, disposability or reusability of components. This parallel-plate waveguide approach allows coupling modular components with a high positioning tolerance and broadband matching with minimal losses. Significantly, higher Q-factors for the resonant sensing components are achieved with this new approach.

44 citations


Cited by
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Book
15 May 2007
TL;DR: In this paper, the authors discuss the role of surface plasmon polaritons at metal/insulator interfaces and their application in the propagation of surfaceplasmon waveguides.
Abstract: Fundamentals of Plasmonics.- Electromagnetics of Metals.- Surface Plasmon Polaritons at Metal / Insulator Interfaces.- Excitation of Surface Plasmon Polaritons at Planar Interfaces.- Imaging Surface Plasmon Polariton Propagation.- Localized Surface Plasmons.- Electromagnetic Surface Modes at Low Frequencies.- Applications.- Plasmon Waveguides.- Transmission of Radiation Through Apertures and Films.- Enhancement of Emissive Processes and Nonlinearities.- Spectroscopy and Sensing.- Metamaterials and Imaging with Surface Plasmon Polaritons.- Concluding Remarks.

7,238 citations

Journal ArticleDOI
TL;DR: An overview of the status of the terahertz technology, its uses and its future prospects are presented in this article, with a focus on the use of the waveband in a wide range of applications.
Abstract: Research into terahertz technology is now receiving increasing attention around the world, and devices exploiting this waveband are set to become increasingly important in a very diverse range of applications. Here, an overview of the status of the technology, its uses and its future prospects are presented.

5,512 citations

Journal ArticleDOI
TL;DR: Terahertz spectroscopy and imaging provide a powerful tool for the characterization of a broad range of materials, including semiconductors and biomolecules, as well as novel, higher-power terahertz sources.
Abstract: Terahertz spectroscopy systems use far-infrared radiation to extract molecular spectral information in an otherwise inaccessible portion of the electromagnetic spectrum. Materials research is an essential component of modern terahertz systems: novel, higher-power terahertz sources rely heavily on new materials such as quantum cascade structures. At the same time, terahertz spectroscopy and imaging provide a powerful tool for the characterization of a broad range of materials, including semiconductors and biomolecules.

2,673 citations

Journal ArticleDOI
04 Jan 2007-Nature
TL;DR: The presence of tiny holes in an opaque metal film leads to a wide variety of unexpected optical properties such as strongly enhanced transmission of light through the holes and wavelength filtering, which are now known to be due to the interaction of the light with electronic resonances in the surface of the metal film.
Abstract: The presence of tiny holes in an opaque metal film, with sizes smaller than the wavelength of incident light, leads to a wide variety of unexpected optical properties such as strongly enhanced transmission of light through the holes and wavelength filtering. These intriguing effects are now known to be due to the interaction of the light with electronic resonances in the surface of the metal film, and they can be controlled by adjusting the size and geometry of the holes. This knowledge is opening up exciting new opportunities in applications ranging from subwavelength optics and optoelectronics to chemical sensing and biophysics.

2,009 citations

Journal ArticleDOI
TL;DR: Terahertz irradiation and sensing is being applied for the first time to a wide range of fields outside the traditional niches of space science, molecular line spectroscopy, and plasma diagnostics as discussed by the authors.
Abstract: Terahertz irradiation and sensing is being applied for the first time to a wide range of fields outside the traditional niches of space science, molecular line spectroscopy, and plasma diagnostics. This paper surveys some of the terahertz measurements and applications of interest in the biological and medical sciences.

1,090 citations