Engineering the dispersion of metamaterial surface for broadband infrared absorption

Qin, Feng; Pu, Mingbo; Hu, Chenggang; Luo, Xiangang

doi:10.1364/ol.37.002133

Cited by 257 publications

(163 citation statements)

References 17 publications

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“…Among the recently suggested absorbers, those based on quasiplanar metamaterials should be mentioned, which enable perfect (unity) absorption [17][18][19][20][21][22][23]. High-efficiency absorption can be obtained in a wide range of the incidence angle variation [24][25][26], including the case of perfect absorption [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics

2014

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One-way absorption can be obtained at terahertz frequencies in low-profile rod-type and multilayer dielectric structures with broken spatial inversion symmetry, which contain either a rod layer or an ultrathin homogeneous layer made of a polar dielectric. Perfect absorption for one of the two opposite incidence directions and perfect reflection for the other one are observed at the edge of the polaritonic gap in a wide range of the incident angle variation, when the thickness of the entire structure is of the order of the incident wavelength. Moreover, this regime appears in a wide frequency range, in which the forward-to-backward absorption contrast is strong. The exploited mechanism is connected with the parameter adjustment that enables the location of the polaritonic gap of the polar dielectric, of which the lossy part of the structure is made, inside the stop band arising due to the periodicity of the lossless part of the structure that is made of a nondispersive dielectric. It also exploits absorption enhancement in the lossy part by backing it with the highly reflecting lossless part, which has alternating stop and pass bands.

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Section: Introductionmentioning

confidence: 99%

One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics

2014

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“…The need for high-performance THz absorber is increasing due to both the academic application and military requirement to provide concealment. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] In the past few years, doped silicon has been introduced to improve the THz absorption efficiency and bandwidth. [22][23][24][25][26][27] As a desirable lossy material at THz frequency, doped silicon can support surface plasmon polaritons and accordingly localized surface plasmon resonances via periodic structures.…”

Section: Introductionmentioning

confidence: 99%

A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

Jiang

Zhai

et al. 2016

AIP Advances

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Perfect absorbers with broadband absorption of terahertz (THz) radiation are promising for applications in imaging and detection to enhance the contrast and sensitivity, as well as to provide concealment. Different from previous two-dimensional structures, here we put forward a new type of THz absorber based on sawtooth-shape doped-silicon with near-unit absorption across a broad spectral range. Absorbance over 99% is observed numerically from 1.2 to 3 THz by optimizing the geometric parameters of the sawtooth structure. Our absorbers can operate over a wide range of incident angle and are polarization insensitive. The underlying mechanisms due to the combination of an air-cavity mode and mode-matching resonance on the air-sawtooth interface are analyzed in terms of the field patterns and electromagnetic power loss features.

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“…Optimisation of the structure is then performed to obtain the best selective performance and gold is replaced by the high melting point metal, tungsten which would enable very high temperature operation. Finally a cross type [17] patterned upper layer is introduced which improves the short wavelength absorption while maintaining the longer wavelength performance obtained from a simple square array structure. Figure 1 shows the simulated solar spectrum modelled as a blackbody at T = 6000K and also the radiated power from an ideal blackbody at 500K, 800K and 1000K [18].…”

Section: Introductionmentioning

confidence: 99%

Broadband metasurface absorber for solar thermal applications

Wan

Chen

Cryan

2015

J. Opt.

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In this paper we propose a broadband polarization independent selective absorber for solar thermal applications. It is based on a metal-dielectric-metal metasurface structure, but with an inter-layer of absorbing amorphous carbon rather than a low loss dielectric. Optical absorbance results derived from Finite Difference Time Domain modelling are shown for ultra-thin carbon layers in air and on 200nm of gold for a range of carbon thicknesses. A gold-amorphous carbon-gold trilayer with a top layer consisting of a 1D grating is then optimised in 2D to give a sharp transition from strong absorption up to 2m to strong reflection above 2m resulting in good solar selective performance. The gold was replaced by the high melting point metal tungsten and is shown to have very similar performance to the gold case. 3D simulations then show that the gold based structure performs well as a square periodic array of squares, however there is low absorption around 400nm. A cross based structure is found to increase this absorption without significantly reducing the performance at longer wavelengths.

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Engineering the dispersion of metamaterial surface for broadband infrared absorption

Cited by 257 publications

References 17 publications

One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics

One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics

A high-performance broadband terahertz absorber based on sawtooth-shape doped-silicon

Broadband metasurface absorber for solar thermal applications

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