Plasmonic metamaterial using metal-insulator-metal nanogratings for high-sensitive refraction index sensor

Reconfigurable metamaterials for optoelectronic applications

“…Since 2000, there have been reported many visible metamaterials to be used in color filters, resonators, absorbers, and sensors. [72][73][74][75][76][77][78] Lin et al proposed four types of suspended nanodisk metasurfaces, which exhibit perfect absorption characteristics with ultrabroad tuning range of resonance spanning the whole visible spectra range and narrower bandwidth as shown in Figure 4(a). [79] The same research group also demonstrated two designs of high-efficiency reconfigurable color filter based on suspended rectangular Al and elliptical lithium niobate (LiNbO 3 ) metasurfaces on Si substrate coated with an Al mirror layer atop as shown in Figure 4(b).…”

“…[76] The same research group also demonstrated two kinds of plasma metamaterial IR filters, which composed of metal nanogratings on SiO 2 layer with a tuning wavelength range of 2.4 lm as shown in Figure 5(e). [77] The IR incident wave can be tuned by changing the vertical distance between top and bottom metal nanogratings using MEMES technique. The IR incident wave can also be tuned horizontally using electrothermal force to change the gap between metamaterials as shown in in Figure 5 (f).…”

“…[86] As shown in Figure 5(i), Gholipour Figure 5. Reconfigurable metamaterials in IR spectrum range for (a and b) absorbers, [73,74] (c and d) polarizers, [75,76] , (e and f) filters, [77,78] (g and h) sensors, [85,86] and (i and j) switches [87][88][89] applications. et al demonstrated an metamaterials-based optical switch for near to middle IR wavelengths and verified the non-volatile and reversible optical exchange function by repeating the operation cycle of device.…”

A highly stable and sensitive ethanol sensor based on Ru-decorated 1D WO3 nanowires

“…The electrical properties of metal oxide semiconductors (MOS) are related to the ambient atmosphere, and they have the features of low cost, robustness, and easy synthesis. 1-3 Thus, they play a signicant role in gas sensing applications to detect toxic, inammable and explosive gases, 4-6 and are more favored by scientic researchers compared to sensors based on metamaterials [7][8][9][10] or nanophotonics. [11][12][13] MOS-based sensors have been reported over the past several decades, including sensors based on CuO, 14 SnO 2 , 15 In 2 O 3 , 16 Co 3 O 4 , 17 Fe 2 O 3 , 18 ZnO, 19 and NiO, 20 for applications such as monitoring air quality and ensuring industrial safety.…”

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].…”