Author
John B. Pendry
Other affiliations: University of California, San Diego, Duke University, Bell Labs ...read more
Bio: John B. Pendry is an academic researcher from Imperial College London. The author has contributed to research in topics: Metamaterial & Plasmon. The author has an hindex of 100, co-authored 536 publications receiving 88802 citations. Previous affiliations of John B. Pendry include University of California, San Diego & Duke University.
Papers published on a yearly basis
Papers
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01 Jan 1988
TL;DR: In this article, the authors used an interplay of Bloch's theorem for the substrate and local treatments for the adsorbate atoms to make accurate calculations of diffusely scattered intensities.
Abstract: Extensive progress has been made in collaboration with the Erlangen group of Muller and Heinz in treating diffraction from the simplest class of disorder: a lattice gas of adsorbed atoms on an otherwise ordered substrate [1,2]. By using an interplay of Bloch’s theorem for the substrate and local treatments for the adsorbate, accurate calculations of the diffusely scattered intensities can be made. The central element of the theory is that in order to appear in the diffuse part of the pattern an electron must have struck an adsorbate atom and therefore its experience of the disorder is a strictly local one, just as in a SEXAFS experiment.
01 Jan 1985
TL;DR: In this article, a matrix formulation of renormalized forward scattering (RFS) perturbation theory is used to estimate the diffuse intensity distributions of elasticaly scattered electrons generated by disordered adsorbates on surfaces.
Abstract: The novel method of interpreting the diffuse intensity distributions of elasticaly scattered electrons generated by disordered adsorbates on surfaces [21.1] is shown to be capable of being applied even to the case of adsorbates consisting of large organic molecules. Use is made of a matrix formulation of renormalized forward scattering (RFS) perturbation theory in the cluster calculations. The prospects for accurately determining the adsorption sites and orientations of isolated or disordered complex molecules by LEED are discussed
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TL;DR: In this paper, a symmetry breaking transition between free-flowing fluid-like Bloch waves observed at lower grating velocities and condensed, localised states of light captured in each period of the grating and locked to its velocity is observed.
Abstract: In gratings travelling at nearly the velocity of light a symmetry breaking transition is observed between free-flowing fluid-like Bloch waves observed at lower grating velocities and, at luminal velocities, condensed, localised states of light captured in each period of the grating and locked to its velocity. We introduce a new technique for calculating in this regime and use it to study the transition in detail shedding light on the critical exponents, and the periodic oscillations in transmitted intensity seen in the pre-transition regime.
01 Jan 1988
TL;DR: In this paper, the calculation of electronic properties for infinite systems that are also disordered has been severely hampered by the absence of a Bloch theorem, and recent theoretical work has begun to remove these restrictions to enable analytic and computational studies to be extended to this relatively unexplored class of matter.
Abstract: The calculation of electronic properties for infinite systems that are also disordered has been severely hampered by the absence of a Bloch theorem. Recent theoretical work [1,2] has begun to remove these restrictions to enable analytic and computational studies to be extended to this relatively unexplored class of matter.
01 Jan 1995
TL;DR: In the same way that we observe electronic properties to change from insulators to semiconductors, to metals, so we must expect light to be radically affected by the physical structure of a medium.
Abstract: In the same way that we observe electronic properties to change from insulators to semiconductors, to metals, so we must expect light to be radically affected by the physical structure of a medium. Yablonovitch [1] has pointed out that, given the right structure, materials can mimic most of the electronic effects. For example we can have a ‘photonic insulator’ from which all light is excluded, even zero point fluctuations. The interior of such a material would be insulated from the influence of these frequencies of electromagnetic wave. This radical restructuring of the electromagnetic spectrum over large regions of space by a process that may be as simple as drilling holes will have important consequences for optoelectronics. In his original paper Yablonovitch considered loss-free dielectric structures, but metals also show dramatic effects when structured on a scale of nanometres and it is with metals that I shall be concerned in this paper.
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28 Jul 2005
TL;DR: PfPMP1）与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作�ly.
Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。
18,940 citations
TL;DR: By altering the structure of a metal's surface, the properties of surface plasmons—in particular their interaction with light—can be tailored, which could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved.
Abstract: Surface plasmons are waves that propagate along the surface of a conductor. By altering the structure of a metal's surface, the properties of surface plasmons--in particular their interaction with light--can be tailored, which offers the potential for developing new types of photonic device. This could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved. Surface plasmons are being explored for their potential in subwavelength optics, data storage, light generation, microscopy and bio-photonics.
10,689 citations
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.
Abstract: We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction (n) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips of standard circuit board material. By measuring the scattering angle of the transmitted beam through a prism fabricated from this material, we determine the effective n, appropriate to Snell's law. These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root of epsilon.mu for the frequencies where both the permittivity (epsilon) and the permeability (mu) are negative. Configurations of geometrical optical designs are now possible that could not be realized by positive index materials.
8,477 citations
TL;DR: In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.
Abstract: We show that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu//sub eff/, which can be tuned to values not accessible in naturally occurring materials, including large imaginary components of /spl mu//sub eff/. The microstructure is on a scale much less than the wavelength of radiation, is not resolved by incident microwaves, and uses a very low density of metal so that structures can be extremely lightweight. Most of the structures are resonant due to internal capacitance and inductance, and resonant enhancement combined with compression of electrical energy into a very small volume greatly enhances the energy density at critical locations in the structure, easily by factors of a million and possibly by much more. Weakly nonlinear materials placed at these critical locations will show greatly enhanced effects raising the possibility of manufacturing active structures whose properties can be switched at will between many states.
8,135 citations
TL;DR: Recent advances at the intersection of plasmonics and photovoltaics are surveyed and an outlook on the future of solar cells based on these principles is offered.
Abstract: The emerging field of plasmonics has yielded methods for guiding and localizing light at the nanoscale, well below the scale of the wavelength of light in free space. Now plasmonics researchers are turning their attention to photovoltaics, where design approaches based on plasmonics can be used to improve absorption in photovoltaic devices, permitting a considerable reduction in the physical thickness of solar photovoltaic absorber layers, and yielding new options for solar-cell design. In this review, we survey recent advances at the intersection of plasmonics and photovoltaics and offer an outlook on the future of solar cells based on these principles.
8,028 citations