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
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TL;DR: In this article, the authors define a constant refractive index (CRI) model in which Bloch waves remain well defined as they break the light barrier, then show their dispersion rotating through 360 degrees from negative to positive and back again.
Abstract: We ask the question 'what happens to Bloch waves in gratings synthetically moving at near the speed of light?'. First we define a constant refractive index (CRI) model in which Bloch waves remain well defined as they break the light barrier, then show their dispersion rotating through 360 degrees from negative to positive and back again. Next we introduce the effective medium approximation (EMA) then refine it into a 4-wave model which proves to be highly accurate. Finally using the Bloch waves to expand a pulse of light we demonstrate sudden inflation of pulse amplitude combined with reversal of propagation direction as a luminal grating is turned on.
TL;DR: In this article, a first principles theory of quantum transport was developed to address the problem of localisation directly without resort to scaling, and it was shown that the localised states behave as extremely long-lived traps with a distribution of lifetimes that leads to the generation of 1/f noise at surfaces and interfaces.
Abstract: Systems with large amounts of disorder have some remarkable properties induced by localisation of the electronic wavefunctions [1, 2]. Current formulations of quantum transport have limited relevance to the case of strong disorder and require the use of scaling theories to apply them to these systems [3]. We have been developing a first principles theory of quantum transport that addresses the problem of localisation directly without resort to scaling [4-6]. The theory reproduces well known results for the d.c. conductivity, but goes beyond that to describe the bandwidth of localised structures when used to convey electrical signals, as well as the non-linearity in the d.c. conductivity implicit in these systems. We have also been able to show that the localised states behave as extremely long lived traps with a distribution of lifetimes that leads to the generation of 1/f noise at surfaces and interfaces.
01 Jun 2015
TL;DR: In this article, a general strategy based on transformation optics is described to investigate a broad variety of plasmonic nanostructures, exploiting the fact that a finite nanoparticle with sharp geometrical features can behave like an infinite plasmoric system and can exhibit a continuous light absorption property over a broadband spectrum.
Abstract: This contribution describes a general strategy, based on transformation optics, to investigate a broad variety of plasmonic nanostructures. We exploit the fact that a finite nanoparticle with sharp geometrical features can behave like an infinite plasmonic system and can exhibit a continuous light absorption property over a broadband spectrum. Comprehensive discussions are provided on how the effects of nonlocality and edge rounding affect the local field enhancement as well as the energy and bandwidth of each plasmonic resonance. Generalization of this method to three dimensional situations will also be discussed. The largely analytic approach gives physical insights into the processes involved and suggests the way forward to study a wide variety of plasmonic nanostructures.
TL;DR: In this paper, the authors describe the contribution of protein crystallography to the understanding of complex biological systems, and of the impact that has had on the design of drugs by computer.
Abstract: New advances in theory and experiment have greatly increased our ability to study structure at surfaces. Not only can complex ordered structures of adsorbates be determined, but we can bring the same high precision techniques to disordered systems, and the methodology is available to find probability distributions of atoms, and hence dynamics of anharmonic vibrations and of diffusion. These advances are reminiscent of the contribution that protein crystallography has made to our understanding of complex biological systems, and of the impact that has had on the design of drugs by computer. Design of heterogeneous catalysts by computer remains a long term goal, but surface studies are on the move in that direction.
01 Jan 1985
TL;DR: In this paper, the authors investigated the importance of various multiple-scattering corrections to electron propagation in near-edge X-ray absorption spectra using the 0/Ni(100) system as an example.
Abstract: We investigate the importance of various multiple-scattering corrections to electron propagation in near-edge X-ray absorption spectra using the 0/Ni(100) system as an example. We find that within approximately 10 of the absorption edge multiple scattering contributions cannot be neglected, though for greater energies the convergence of all perturbation schemes is quite rapid. We also outline our recently developed geometric series representation of renormalized forward scattering perturbation theory.
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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