Ultra-broadband and high absorbance metamaterial absorber in long wavelength Infrared based on hybridization of embedded cavity modes

OPTICS COMMUNICATIONS

卷:448

Article

Luo, Yi^1,2  Liang, Zhongzhu¹  Meng, Dejia¹  Tao, Jin¹  Liang, Jingqiu¹  Chen, Changhong³  Lai, Jianjun³  Qin, Yuxin¹  Lv, Jinguang¹  Zhang, Yuhao^1,2 

[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Appl Opt, Changchun 130033, Jilin, Peoples R China

[2] Univ Chinese Acad Sci, Beijing, Peoples R China

[3] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, Peoples R China

关键词: Metamaterial absorbers;    Long wavelength infrared;    Embedded cavity modes;   

DOI  :  10.1016/j.optcom.2019.04.080

来源: Elsevier

【 摘 要 】

We present a novel ultra-broadband, polarization-independent, and wide-angle metamaterial absorber whose metal-insulator-metal cavities are embedded into bulk insulator nanodisks. The hybridization of multiple embedded cavity modes generated by the combination of dielectric-loaded surface plasmon polaritons waveguide and cavity modes contributes to large bandwidth and high absorption in the long wavelength infrared (LWIR) region. The proposed structure exhibits more than 94% absorbance in the interval from 8 mu m to 16 mu m; and more than 95% absorbance over the whole LWIR band (8-14 mu m), which is superior than the initial MIM structure (absorption greater than 90% from 8.10-14.33 mu m) and similar kinds of metamaterial absorber based on noble metal. In addition, a nearly perfect absorbance (more than 99%) is obtained in the 11.22-12.46 mu m and 13.26-14.59 mu m wavebands. Moreover, results show that the resonant wavelength and operating bandwidth can be adjusted flexibly by varying related geometry parameters. Thus, the wavelength-selective metamaterial absorber is promising for thermal emitters, energy harvester and microbolometers.

【 授权许可】

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