Results 21 to 30 of about 7,053 (306)
We present the realization of a high-efficiency, compact, and thermally tunable unidirectional launcher of surface plasmon polaritons (SPPs) in a double-slit structure filled with phase change materials (PCMs). PCMs such as VO2 provide a feasible way for
Mehdi Afshari-Bavil +4 more
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Compact Broadband Directional Couplers Using Subwavelength Gratings
We experimentally demonstrate compact broadband directional couplers using subwavelength gratings for silicon-on-insulator wafers with silicon layers of 220 nm.
Yun Wang +6 more
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Tunable Flat-Top Filtering Response in Cascaded Resonant Waveguide Gratings
The applicability of resonant waveguide grating (RWG)-based structures as filters to control the spectral response in an optical communication system is investigated.
Jinhua Hu +5 more
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A Slot-Based Surface Plasmon-Polariton Waveguide With Long-Range Propagation and Superconfinement
A full-vector spectral element method (SEM) is applied to model and simulate surface plasmon-polariton (SPP) waveguides. Gauss-Lobatto-Legendre (GLL) polynomials are used to construct higher-order basis functions to achieve spectral accuracy.
G. X. Cai +4 more
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Novel Quadruple-Band Microwave Metamaterial Absorber
In this paper, we report the design, analysis, and simulation of a novel quadrupleband metamaterial absorber at microwave frequencies. The absorber is composed of delicate periodic patterned structures and a metallic background plane, which are separated
Nan Wang +6 more
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Polarization quadrature measurement of subwavelength diffracting structures [PDF]
The amplitude and the phase of the diffracted far field depends on polarization when the diffracting structure is comparable to or less than the wavelength. When the far-field amplitude and the phase of one polarization with respect to the orthogonal polarization is measured, small changes in the structure can be measured.
Marx, D. S., Psaltis, D.
openaire +3 more sources
Microcavities with suspended subwavelength structured mirrors.
We investigate the optical properties of microcavities with suspended subwavelength structured mirrors, such as high-contrast gratings or two-dimensional photonic crystals slabs, and focus in particular on the regime in which the microcavity free-spectral range is larger than the width of a Fano resonance of the highly reflecting structured mirror.
Næsby, Andreas, Dantan, Aurelien Romain
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Arbitrarily-Wide-Band Dielectric Mirrors and Their Applications to SiGe Solar Cells
The dielectric mirror is an important optical component for optoelectronic devices, passive photonic devices, and solar cells. Unfortunately, the reflection bandwidth of distributed Bragg reflectors (DBRs) and high-index contrast mirrors (HCGs) are ...
Yan Kai Zhong +4 more
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Compressive Imaging of Subwavelength Structures [PDF]
The problem of imaging extended targets (sources or scatterers) is formulated in the framework of compressed sensing with emphasis on subwavelength resolution. The proposed formulation of the problems of inverse source/scattering is essentially exact and leads to the random partial Fourier measurement matrix.
openaire +2 more sources
Guiding and Confining Light in Low-Index Circularly Symmetric Waveguides
A circularly symmetric waveguide with a low-index ring inside the core has been proposed and studied comprehensively. By taking advantage of the azimuthal TM01 mode, the structure can confine light inside the low-index region with very high power ...
Wenfu Zhang +3 more
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