Engineering Research Centre of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract An ultra-broadband perfect absorber consisting of cascaded nanodisk arrays is demonstrated by placing insulator-metal-insulator-metal nanodisks on insulator-metal film stacks. The absorber shows over 90% absorption in a wavelength range between 600 nm and 4000 nm under transverse magnetic (TM) polarization, with an average absorptivity of 91.5% and a relative absorption bandwidth of 147.8%. The analysis of the electric field and magnetic field show that the synergy of localized surface plasmons, propagating surface plasmons, and plasmonic resonant cavity modes leads to the ultra-broadband perfect absorption, which accords well with the results of impedance-matched analysis. The influences of structural parameters and different metal materials on absorption performance are discussed. Furthermore, the absorber is polarization-independent, and the absorption remains more than 90% at a wide incident angle up to 40° under TE polarization and TM polarization. The designed ultra-broadband absorber has promising prospects in photoelectric detection and imaging.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61775140 and 62005165).
Corresponding Authors:
Qi Wang
E-mail: shelly3030@163.com
Cite this article:
Qi Wang(王琦), Rui Li(李瑞), Xu-Feng Gao(高旭峰), Shi-Jie Zhang(张世杰), Rui-Jin Hong(洪瑞金), Bang-Lian Xu(徐邦联), and Da-Wei Zhang(张大伟) Ultra-broadband absorber based on cascaded nanodisk arrays 2022 Chin. Phys. B 31 040203
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