Tunable ultra-narrowband terahertz perfect absorber by using metal-insulator-metal microstructures

Metallic and dielectric metasurfaces in photoconductive terahertz devices: a review

“…137,138 However, the emitted THz power of the standalone metal metasurface is relatively low compared with the plasmonic PCA 69 and even to the surface photo-Dember THz emitter 136 and amounts, on average, to 0.15 mW, corresponding to an optical-to-THz conversion efficiency of up to 0.01% at 5.8 THz. 135 Furthermore, both metallic and dielectric metasurface configurations can be designed to effectively interact with THz radiation and thus can be used in ultrasensitive THz sensors, THz absorbers, highly selective THz detectors, tunable THz field modulators, [139][140][141][142] and THz mirrors, 143 as well as to control a wavefront at THz frequency, 144 etc.…”

Reconfigurable metamaterials for optoelectronic applications

“…The absorption intensity of proposed device is 99% with an ultra-high Q-factor of 143 as shown in Figure 6(b). [91] Figure 6(c) shows a three-layered metamaterial to effectively rotate THz wave as a linear polarizer. [75] They also demonstrated a tunable THz chain-link metamaterial to exhibit bidirectional polarization-dependence as shown in Figure 6(d).…”

“…[85] In the Lin's research group, they proposed a series of THz metamaterial sensors and switches, such as three designs of tunable multi-resonance of THz metamaterials composed of single-, dual-, and triple-split-disk resonators (Figure 6(h)), [95] a tunable THz metamaterial with single-band and Figure 6. Reconfigurable metamaterials in THz spectrum range for (a and b) absorbers, [90,91] (c and d) polarizers, [75,92] (e and f) filters, [93,94] (g and h) sensors, [85,95] and (i-l) switches [96][97][98][99] applications.…”

Tunable Infrared Metamaterial Emitter for Gas Sensing Application

“…The permittivity and permeability of metamaterials can be tailored by properly engineering the geometrical dimensions and material compositions of their subwavelength periodic patterns. They are widely studied to realize thermal emitters and are perfect absorbers for energy harvesting, medical imaging, and high-sensitivity sensing applications [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. By tailoring the geometrical dimensions, metamaterials can be designed to span broad operating wavelengths, including visible [31][32][33], IR [34][35][36][37][38][39], terahertz [40][41][42][43][44], and microwave light [45,46].…”