Affiliation:
1. Central South University
2. Changsha University of Science and Technology
3. Hunan First Normal University
4. University of Chinese Academy of Sciences
Abstract
Dynamical control of perfect absorption plays an indispensable role in optical switch and modulators. However, it always suffers from the limited modulation range, small depth, and susceptible absorption efficiencies. Here, we propose a new strategy based on Friedrich–Wintgen bound states in the continuum (F–W BICs) to realize a tunable perfect absorber with large dynamic modulation range. For proof of concept, we demonstrate a pentaband ultrahigh absorption system consisting of graphene gratings and graphene sheets through elaborately tuning F–W BIC. The nature of the F–W BIC arises from the destructive interference between Fabry–Perot resonance and guided mode resonance modes in the coherent phase-matching condition. The radiation channels are avoided from crossing. The BIC can be dynamically modulated by engineering the Fermi level of graphene gratings, which breaks the traditional modulation methods with an incidence angle. Remarkably, the perfect absorber with this F–W BIC approach achieves the largest modulation range of up to 3.5 THz. We believe that this work provides a new way to dynamically engineer perfect absorption and stimulates the development of multiband ultracompact devices.
Funder
Hunan Provincial Innovation Foundation for Postgraduate
Shanghai Municipal Science and Technology Major Project
Science and Technology Commission of Shanghai Municipality
Shanghai Rising-Star Program
Natural Science Foundation of Zhejiang Province
Strategic Priority Research Program of Chinese Academy of Sciences
Youth Innovation Promotion Association of the Chinese Academy of Sciences
National Natural Science Foundation of China
National Key Research and Development Program of China
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
14 articles.
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