Narrowband perfect terahertz absorber based on polar-dielectrics metasurface*

Abstract

We theoretically propose a narrowband perfect absorber metasurface (PAMS) based on surface phonon polaritons in the terahertz range. The PAMS has unit cell consisting of a silver biarc on the top, a thin polar-dielectric in the middle and a silver layer at the bottom. The phonon polaritons are excited at the interface between the silver biarc and the polar dielectric, and enhance the absorption of the PAMS. The absorption peak is at 36.813 μm and the full width half maximum (FWHM) is nearly 36 nm, independent of the polarization and incidence angle. The electric fields are located at the split of the biarc silver layer and the quality factor Q is 1150. The FWHM decreases with the decreasing split width. When the thickness of the bottom layer is larger than 50 nm, the narrow band and high absorption are insensitive to the thickness of those layers. The designed absorber may have useful applications in terahertz spectra such as energy harvesting, thermal emitter, and sensing.

Atomic Spin Detection Method Based on Spin‐Selective Beam‐Splitting Metasurface

“…[11] Highly miniaturized optical elements with specific functions can be designed by using nanoscale structures as the metasurface structural units. The advancement of processing technology has greatly facilitated the commercialization of micro-and nano-devices, [12] such as metasurface-based polarizer, [13][14][15] focusing lens, [16][17][18][19] beam splitter, [20][21][22][23][24][25][26][27][28] intelligent metasurface, [29,30] light wave absorber, [31][32][33] sensor, [34][35][36][37] and so on. By controlling the phase, polarization, and amplitude of the electromagnetic wave on the subwavelength scale using metasurface, the shortcomings of large volume and difficult integration of PBS can be effectively solved.…”

An ultra-wideband 2-bit coding metasurface using Pancharatnam–Berry phase for radar cross-section reduction

“…Through the reasonable design of the unit cell structures, almost all the basic properties of electromagnetic (EM) waves can be tailored by using various metasurfaces. Due to the favorable characteristics of metasurfaces, a variety of metasurfaces, such as metasurface absorbers, [1][2][3][4][5] artificial magnetic conductors (AMC) [6][7][8][9][10][11] and coding metasurfaces [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] have been proposed to reduce the radar cross-section (RCS) of stealth targets.…”

An ultra-thin terahertz broad-band metamaterial absorber based on a rhombus ring resonator

“…Since then, great progress has been made on MMAs with high absorptivity. For the frequency band of absorption, many MMAs suitable for microwave [15], THz [16], far-infrared [17], mid-infrared [18][19][20], near-infrared [21], visible [22] and ultraviolet [23] have sprung up; while for the properties, MMAs with multi-band [24], broad-band [25], polarization insensitive [26], wide operating angle [27], tunable [28] are also gradually emerging.…”