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 article, an insightful theoretical description of the optical properties of touching metal nanospheres is presented, which exploits transformation optics ideas within the quasistatic approximation, yields simple expressions for all the relevant electromagnetic magnitudes in these singular nanoparticle geometries.
Abstract: We present an insightful theoretical description of the optical properties of touching metal nanospheres. Our approach, which exploits transformation optics ideas within the quasistatic approximation, yields simple expressions for all the relevant electromagnetic magnitudes in these singular nanoparticle geometries. We demonstrate the highly efficient collection and concentration of light featured by nanosphere dimers, and show the prominent field enhancement that takes place at the point of contact between a single nanoparticle and a flat metal surface. Our method evidences that surface plasmon modes play a key role in the broadband light harvesting capabilities of these nanostructures. The range of validity of our analytical results are explored through the comparison with numerical full electrodynamic simulations.
14 citations
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TL;DR: In this paper, a normal phase array is embedded within a superlens (made of negative refractive index material) to overcome the trade-off between the compactness of a phase array and its directivity.
Abstract: For a long time phase arrays have been used in a variety of wave transmission applications because of their simplicity and versatility. Conventionally there is a trade-off between the compactness of a phase array and its directivity. In this paper we demonstrate how by embedding a normal phase array within a superlens (made of negative refractive index material) we can overcome this constraint and create compact phase arrays with a virtual extent much larger than the physical size of the array. In this paper we also briefly discuss the apparent unphysical field divergences in superlenses and how to resolve this issue.
14 citations
TL;DR: In this article, the authors postulate that at least part of the remaining discrepancy is due to the non-spherical potential caused by a dipole moment on the alkali atom.
14 citations
TL;DR: In this paper, the authors take this nonlocal effect into account for singular plasmic metasurfaces with sharp features, such as narrow gaps and sharp edges, and lead to a discretization of the continuous spectrum.
Abstract: Advances in nanofabrication have recently made possible plasmonic nanostructures with features on very short length scales, enabling confinement of electromagnetic fields even to subnanometric scales. On this atomic scale, a classical local description of the dielectric function is no longer valid and effects such as electron spill-out at metal surfaces become relevant. Here, the authors take this nonlocal effect into account for singular plasmic metasurfaces with sharp features, such as narrow gaps and sharp edges. Nonlocal effects are prominent in these geometric singularities and lead to a discretization of the continuous spectrum. On the surface, the oscillation of the surface plasmon polaritons propagating toward the singularity is weakened, and this microscopic effect significantly affects the far-field spectrum.
14 citations
TL;DR: The recent suggestion that a diffuse low-energy-electron-diffraction pattern from a disordered layer of adsorbate atoms on a crystal surface may be interpreted as a Fraunhofer hologram is put to a practical test in the case of O/Ni(100).
Abstract: The recent suggestion that a diffuse low-energy-electron-diffraction pattern from a disordered layer of adsorbate atoms on a crystal surface may be interpreted as a Fraunhofer hologram, from which crystallographic information may be extracted directly, is put to a practical test in the case of O/Ni(100). Holographic reconstruction yields an image of the Ni atoms closest to the O adsorbates. The image resolution appears sufficient for its use as a starting point for more established crystallographic techniques, to discriminate, in a preliminary search, between very different models
14 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