中国物理B ›› 2022, Vol. 31 ›› Issue (4): 40203-040203.doi: 10.1088/1674-1056/ac2d1d

• • 上一篇    下一篇

Ultra-broadband absorber based on cascaded nanodisk arrays

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)   

  1. 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
  • 收稿日期:2021-07-17 修回日期:2021-09-22 接受日期:2021-10-06 出版日期:2022-03-16 发布日期:2022-03-25
  • 通讯作者: Qi Wang E-mail:shelly3030@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61775140 and 62005165).

Ultra-broadband absorber based on cascaded nanodisk arrays

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)   

  1. 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
  • Received:2021-07-17 Revised:2021-09-22 Accepted:2021-10-06 Online:2022-03-16 Published:2022-03-25
  • Contact: Qi Wang E-mail:shelly3030@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61775140 and 62005165).

摘要: 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.

关键词: ultra-broadband absorption, cascaded nanodiskarrays, polarization-independent

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.

Key words: ultra-broadband absorption, cascaded nanodiskarrays, polarization-independent

中图分类号:  (Finite-difference methods)

  • 02.70.Bf
02.60.Cb (Numerical simulation; solution of equations) 03.50.De (Classical electromagnetism, Maxwell equations)