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An optical coupler composed of gold cylinder arrays overlaid with a gold film was proposed for quantum well infrared photo-detector. Finite difference time-domain method was used to numerically investigate the near-field enhancement. The result showed that for the x-polarized light normally incident from the backside, strong electric field component perpendicular to the quantum well can be generated,...
We investigate the impact of rotational symmetry of the metamaterial perfect absorber on its performance. The calculated results show that a absorption peak appears at the same wavelength in the absorption spectrum no matter the polarization of the incident light parallels to x axis or y axis when the absorber possesses four-fold rotational symmetry. However, in the case of two-fold rotational symmetry,...
M. W. Chen and co‐workers present a novel gold‐decorated nanoporous copper (Au@NPC) core–shell composite on page 2279. Thin gold shells with controllable thickness are homogeneously deposited onto the internal surfaces of 3D NPC via a spontaneous displacement reaction while NPC is utilized as a reduction agent as well as template and substrate. The inexpensive core shell nanostructure exhibits significant...
Bimetallic core–shell nanostructures have attracted increasing attention due to their low material costs along with enhanced chemico‐physical properties in comparison with their monometallic counterparts. Here, a novel gold‐decorated nanoporous copper (Au@NPC) core–shell composite fabricated by a facile in situ hydrometallurgy approach is reported. Thin gold shells with a controllable thickness are...
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