Triple-Band Perfect Light Absorber Based on Hybrid Metasurface for Sensing Application

Abstract

A simple design of triple-band perfect light absorber (PLA) based on hybrid metasurface in visible region has been presented in this work, which turns out to be applicable for refractive index (RI) sensing. Distinct from previous designs, the proposed hybrid metasurface for visible PLA is only consisted of periodic silicon cross nanostructure arrays and gold substrate. The periodic silicon cross arrays deposited on the gold substrate contribute to excite the guided modes under the normal incident light illumination. According to the simulation results, it can be found that three perfect absorption peaks of 98.1%, 98.7%, and 99.6% which are located at 402.5 THz, 429.5 THz, and 471.5 THz, respectively, have been clearly observed in PLA. This triple-band perfect absorption effect could be attributed to the intrinsic loss of silicon material originated from the guided mode excitations caused by the standing waves of different orders. It has been confirmed that the perfect absorption properties of the PLA can be easily regulated by changing the geometric parameters of the unit-cell nanostructure. Furthermore, the designed PLA served as a RI sensor can achieve sensitivity of about 25.3, 41.3, and 31.9 THz /refractive index unit (RIU). It can be believed that the proposed design of PLA for RI sensing would provide great potential applications in sensing, detecting, the enhanced visible spectroscopy, etc.

A Wide Incident Angle, Ultrathin, Polarization-Insensitive Metamaterial Absorber for Optical Wavelength Applications

“…MMAs also can be found in IR [65], lower MIR [66], UV [67], THz [68], [69], GHz [70], MHz [71], KHz [72], Hz [73] with visible/optical region as discussed above with applications like STPV [74], [75], light trapper [76], cryptography [77], thermal detector [78], sound absorption [79], underwater sound absorption [80], detectors [81], military radar devices [81], detection of explosives [82], photonic circuit [83], filter [84], refractive index sensor [85], reflector [86], thermal imaging [87], antenna [88], light detection [89], [90], energy harvesting [91], [92], imaging [93], [94], sensors [95]- [98].…”

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 ].…”

Investigations on the Resonant Properties of a New Compact Asymmetric Single Split Resonator for Metamaterial Applications

“…Today, wireless systems with a low profile and high selectivity are very much desired for 5G networks [14,15] which rather implies the necessity of highperformance filters with compact structures. Metamaterial designs for absorbers, power dividers, filters, isolation, capacity, and efficiency improvement of antenna in new generation wireless communication systems [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] are catching the eye of industries. Various metamaterial structures such as S-shaped, triangular, CRLH transmission line based, and 2D cross embedded designs are very well explained in the above works of literature.…”