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In the past, the polarization-insensitive absorption is realized mainly employing the two-dimensional periodic structure of fourfold rotational symmetry, which greatly increases the manufacturing complexity and cost. Here, we present the numerical design of a polarization-independent near-perfect absorber incorporating one-dimensional embedded aluminum grating. The absorption peaks near 99% at 520-nm...
A high-performance polarizer based on the double-layer metallic gratings with air-gaps is theoretically investigated. It is observed that the transmission of the TM polarized light greatly exceeds the double-layer metallic gratings without air-gaps. The electric field distributions are plotted to interpret the physical mechanism. The improvement is attributed to the enhanced coupling between the two...
We design and numerically investigate an optical absorber consisting of the sub-wavelength dielectric grating covered by continuous thin aluminum film. In this absorber, the aluminum film act as an efficient absorbing material because of the enhanced electric field in the air nano-grooves, and the absorption spect+rum can be manipulated by Fabry-Perot cavity mode resonance. According to the spectrum...
A reflective-type color filter in the visible range is theoretically investigated. It consists of a transparent flexible substrate, a layer of thick metal, and two-dimensional dielectric-metal grating. The filter proposed here has the advangtages of insensitivity to incident-angle and polarization-independence. It is found that the variations of its geometric parameters can tune the selective wavelength...
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