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Critical route for coherent perfect absorption in a Fano resonance plasmonic system

2014; American Institute of Physics; Volume: 105; Issue: 13 Linguagem: Inglês

10.1063/1.4896972

1520-8842

Ming Kang, Y. D. Chong, Hui‐Tian Wang, Weiren Zhu, Malin Premaratne,

Orbital Angular Momentum in Optics

We develop a method for realizing coherent perfect absorption in thin metamaterial systems, based on the coupled-mode theory of Fano resonance. Coherent perfect absorption refers to the complete absorption of symmetric plane waves incident on opposite sides of the system, due to critical coupling into the dissipative degrees of freedom. Using the reflection and transmission spectra measured on a limited number of samples, our theory predicts the precise frequency and metamaterial parameter values required to achieve coherent perfect absorption. The coupled-mode theory and the design method are found to agree well with full-wave numerical simulations of a subwavelength-thickness metamaterial surface with a pair of bright and dark plasmonic modes.