Ultra-Narrowband Metamaterial Absorbers for High Spectral Resolution Infrared Spectroscopy

被引:113
|
作者
Kang, Sungho [1 ,2 ]
Qian, Zhenyun [1 ,2 ]
Rajaram, Vageeswar [1 ,2 ]
Calisgan, Sila Deniz [1 ,2 ]
Alu, Andrea [3 ,4 ,5 ]
Rinaldi, Matteo [1 ,2 ]
机构
[1] Northeastern Univ, Dept Elect & Comp Engn, 360 Huntington Ave, Boston, MA 02115 USA
[2] Northeastern SMART Ctr, 409 Interdisciplinary Sci & Engn Complex, Boston, MA 02115 USA
[3] CUNY, Adv Sci Res Ctr, Photon Initiat, 85 St Nicholas Terrace, New York, NY 10031 USA
[4] CUNY, Grad Ctr, Phys Program, 365 Fifth Ave, New York, NY 10016 USA
[5] CUNY City Coll, Dept Elect Engn, New York, NY 10031 USA
关键词
infrared absorbers; metamaterials; microelectromechanical system; plasmonics; spectroscopy; OPTICAL-PROPERTIES; MICROBOLOMETERS; RESONANCES; FREQUENCY; FILMS;
D O I
10.1002/adom.201801236
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Metamaterial perfect absorbers (MPAs) are artificial materials composed of an array of subwavelength structures that manipulate electromagnetic waves to achieve extraordinary light absorption properties. Driven by the advent of the Internet of Things, MPAs are employed in microelectromechanical systems for the development of efficient and miniaturized IR detectors, imagers, and spectrometers, thanks to their lithographically tunable peak absorption, spectral selectivity, and ultrathin thickness. MPAs characterized by high absorptance in narrow spectral bands are particularly desirable for the implementation of high-resolution IR spectroscopic sensors. Yet, no accurate analytical model is currently available to guide the design of an MPA with ultra-narrow absorption bandwidth, while meeting all the stringent requirements for spectroscopic sensors. Here, a circuit model capable of accurately predicting spectral responses of metal-insulator-metal (MIM) IR absorbers is reported. The model is experimentally validated in the mid-wavelength IR spectral range and exploited for the first demonstration of an MIM IR absorber that exhibits performance approaching the predicted physical limits: full-width at half-maximum approximate to 3% and near-unity absorption (eta > 99.7%) at 5.83 mu m wavelength, while independent of incident angle and polarization of the impinging IR radiation. These unprecedented absorption properties are key enablers for the development of miniaturized, low-cost, and high-resolution spectrometers.
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页数:8
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