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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TL;DR: In this paper, the loss intensities for the inelastic scattering of low-energy electrons with one-quantum energy loss to the adsorbate vibrations are reported, and the relevant T-matrix element is computed using LEED wavefunctions for the familiar muffin-tin potential model.
Abstract: Calculations are reported of the loss intensities for the inelastic scattering of low-energy electrons with one-quantum energy loss to the adsorbate vibrations. The relevant T-matrix element is computed using LEED wavefunctions for the familiar muffin-tin potential model, so only the impact scattering is calculated. This is the dominant scattering away from specular, and scattering angle-resolved loss intensities for both perpendicular, and parallel adsorbate vibrations are presented. These angular dependences show a wealth of structure, but although the experimental data is scanty, not all of it can be reproduced.
23 citations
TL;DR: In this paper, the authors discuss a theory of photoemission which includes multiple scattering processes, surface effects and hole-lifetimes, and discuss the important consequences of hole lifetime and calculations for three classes of materials represented by copper, nickel and aluminium.
Abstract: We discuss a theory of photoemission which includes multiple scattering processes, surface effects and hole-lifetimes. The important consequences of hole-lifetimes are discussed and calculations presented for three classes of materials represented by copper, nickel and aluminium.
22 citations
TL;DR: In this paper, a new examination of the theory of pseudo-potentials, necessitated by the discovery that smoothness of the pseudo-wave function is not a relevant criterion for their effectiveness, provides an understanding of the analytic properties of pseudopotentials in terms of their pseudo-core energies Ecprime.
Abstract: A new examination of the theory of pseudo-potentials, necessitated by the discovery that smoothness of the pseudo-wave function is not a relevant criterion for their effectiveness, provides an understanding of the analytic properties of pseudo-potentials in terms of their pseudo-core energies Ecprime. In particular, it is found for Hermitian pseudo-potentials that, if Ecprime greater, similar , the Born series cannot have good convergence properties, but, for Ecprime = 0, the series has good asymptotic convergence. The new pseudo-potential, with Ecprime = 0, is the correct form to use at all energies, but differs substantially from other forms only at higher energies. Its effectiveness is demonstrated by a model calculation.
22 citations
TL;DR: In this paper, it was shown that the pseudopotentials of Ziman and Johnson and Slater's augmented plane-wave potential are members of a much larger class of pseudopotential, and a set of rules were proposed for the best choice of radius R, a matter which is especially important at energies above 1-2 ryd such as are used in low-energy electron diffraction.
Abstract: This paper shows that the pseudopotentials of Ziman and Johnson, and Slater's augmented plane-wave potential, are members of a much larger class of pseudopotentials, and proceeds to provide criteria for choosing the pseudopotential most suitable in a given situation. In particular, once the phase shifts have been calculated for the real potential, the radius R in these pseudopotentials is a disposable parameter. A set of rules is proposed for the best choice of R, a matter which is especially important at energies above 1-2 ryd such as are used in low-energy electron diffraction (LEED). One member of this enlarged class of pseudopotentials combines the good convergence properties of the Slater form with the advantage of an angular momentum summation extending over only those values for which the phase shift is non-zero. The convergence, behaviour and misbehaviour, anticipated on theoretical grounds, are demonstrated by numerical calculations.
22 citations
TL;DR: In this paper, a step-by-step procedure for solving electron scattering problems in crystals is proposed, where first scattering for a single atom is calculated, then for a chain of atoms next for a layer of chains and finally for the entire crystal.
Abstract: A step by step procedure is suggested for solving electron scattering problems in crystals. First scattering for a single atom is calculated, then for a chain of atoms next for a layer of chains and finally for the entire crystal. The new method has great speed and flexibility. It is applicable to band structure and LEED calculations and is especially useful in the theory of RHEED.
21 citations
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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