Narrowband Perfect Absorber Based on Dielectric-Metal Metasurface for Surface-Enhanced Infrared Sensing

Abstract

We proposed a narrowband perfect absorber that was based on dielectric-metal metasurface for wide-band surface-enhanced infrared sensing. It is found that the narrowband perfect absorber can generate the hybrid guided modes with high quality-factor at infrared frequencies, which make the absorber highly sensitive to the surrounded analyte. Moreover, tuning the incident angle can actively modulate the resonant wavelength of absorber. Such an absorber with excellent features is employed to realize both refractive index sensing and infrared vibrational fingerprint sensing on a single substrate. It is demonstrated that a refractive index sensitivity of 1800 nm/RIU and figure of merit of 62 RIU−1 can be obtained as the refractive index sensor. While, as a surface enhanced infrared absorption spectroscopy substrate, two closed vibrational modes of analyte with nanometer thick layers can be effectively identified and selectively detected with 50-folds enhancement by actively tuning the incident angle without any change in the structural parameters (periodicity, width, height, and refractive index of the grating) of the device after fabricating. Our study offers a promising approach for designing high-performance surface-enhanced infrared optical sensors in the infrared region.

Quartz-Enhanced Photoacoustic and Photothermal Spectroscopy

“…This study offers a promising approach to designing high-performance surface-enhanced resonators to be employed as optical detectors in the infrared region [12].…”

Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

“…Recently, there is increasing interesting in studying the perfect absorption of electromagnetic waves for refractive-index sensing by employing metasurfaces , metallic nanostructures , and graphene nanostructures [62][63][64][65][66][67][68][69][70][71], in violet [62], visible [1][2][3][4][5][33][34][35][36][37][38][39][40][41][42][43]63,64], infrared [6][7][8][9][10][11][12][13][14][15][16][17][44][45][46][47][48][49][50][51][52]…”

“…Recently, there is increasing interesting in studying the perfect absorption of electromagnetic waves for refractive-index sensing by employing metasurfaces [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ], metallic nanostructures [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , …”

“…When the impedance of artificial metasurfaces is matched with that of vacuum, the incident electromagnetic waves will be nearly completely absorbed at a certain frequency range [ 72 ]. At present, most reported metasurfaces for perfect absorption and sensing are usually composed of a periodic array of metal nanoparticles with various shapes on the top surface of a dielectric film that is deposited on a metal substrate [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. For example, Cong et al demonstrated experimentally the metasurface electromagnetic wave perfect absorber, which consists of a square array of cross-shaped aluminum nanoparticles on a polyimide spacer supported on a very thick aluminum layer [ 19 ].…”

Highly Transparent Broadband and Polarization-Insensitive Absorber Based on Metasurface

“…This absorption property has developed from the polarization sensitivity and normal incidence to polarization-insensitive and wide incidence angle stability [16,17]. The absorption bands have gradually extended from the initial radio frequency and microwave bands [18,19] to terahertz [20][21][22], infrared [23][24][25] and even visible bands [26,27]. Among them, optically transparent metamaterial absorbers have attracted a lot of attention because of their significant and extensive potential applications [28][29][30], such as radio frequency identification systems [31][32][33], electronic toll collection (ETC) systems [34], observation windows in stealth aircraft and electromagnetic shielding of rooms [35].…”