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Optical black hole (OBH) is a special optical structure in which the dielectric function or refractive index of media becomes gradually larger from the outside to the core. Square optical black hole (SOBH) has been proven to be a special and remarkably useful optical structure with broadband omnidirectional light absorption, and a device that is easier to fabricate than circular optical black hole...
Magnetic plasmons polaritons (MPP) mode has attracted a lot of attentions for the explanation of the interesting spectral features of a series of well-known systems of the metal/insulator/metal (MIM) structure with periodic patterns. In this paper, the resonance frequencies in the range from 75 to 750THz predicted by the dispersion relation of MIM system are compared with those predicted by the equivalent...
When the distance between two silver nanoparticles is small enough, interparticle surface plasmon coupling has a great impact on their radiative properties. It is becoming a promising technique to use in the sensing and imaging. A model based on finite difference time domain method is developed to investigate the effect of the assembled parameters on the radiative properties and the field-enhancement...
A kind of concave silicon complex grating based on the superposition of multiple simple silicon gratings with different groove depths (ridge heights) is proposed for a potential application as an absorber for solar cells in the visible and near-infrared wavelength regions. For simple binary gratings, the associated absorptance peak is narrowband and direction sensitive. This study demonstrates that...
The objective of this study was to design a pigmented coating with dark appearance that maintains a low temperature while exposed to sunlight. The radiative properties of a black-color coating pigmented with copper oxide (CuO) submicron particles are described. In the present work, the spectral behavior of the CuO-pigmented coating was calculated. The radiative properties of CuO particles were evaluated,...
Near-field electromagnetic heat transfer is of interest for a variety of applications, including energy conversion, and precision heating, cooling and imaging of nano-structures. This past decade has seen considerable progress in the study of near-field electromagnetic heat transfer, but it is only very recently that numerically exact methods have been developed for treating near-field heat transfer...
This study investigates the spectral radiative properties of inclined parallel-plate arrays with emphasis on the effect of magnetic polaritons. The rigorous coupled-wave analysis (RCWA) is employed and the geometry of parallel-plate arrays is reproduced by considering the structure as a multilayered grating with lateral shift. Enhanced absorption at specific wavelengths with angular independence due...
Radiative energy and momentum transfer due to fluctuations of electromagnetic fields arising due to temperature difference between objects is described in terms of the cross-spectral densities of the electromagnetic fields. We derive relations between thermal non-equilibrium contributions to energy and momentum transfer and surface integrals of tangential components of the dyadic Green's functions...
The optical properties of multi-walled carbon nanotube arrays are investigated using the finite-difference time-domain method, focusing on the effects of various structural randomness, including random position, diameter, length, and orientation. It is found that the arrays with random position, diameter, length, and small inclination angle have quite small absorption enhancement compared to the ordered...
Controlling thermal radiation by tailoring spectral properties of microstructure is a promising method, can be applied in many industrial systems and have been widely researched recently. Among various property tailoring schemes, geometry design of microstructures is a commonly used method. However, the existing radiation property tailoring is limited by adjustability of processed microstructures...
Spectral and directional control of thermal emission holds substantial importance in applications where heat transfer is predominantly by thermal radiation. In this work, we investigate the spectral and directional properties of thermal emission from a novel structure, which is constituted with a photonic crystal (PC) sandwiched by SiC gratings. Numerical results based on the RCWA algorithm reveal...
The purpose of this study is to computationally design a wide-angle cermet-based solar selective absorber for high temperature applications by using a characteristic matrix method and a genetic algorithm. The present study investigates a solar selective absorber with tungsten–silica (W–SiO 2 ) cermet. Multilayer structures of 1, 2, 3, and 4 layers and a wide range of metal volume fractions...
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