Engineering light absorption at critical coupling via bound states in the continuum

Abstract

Recent progress in nanophotonics is driven by the desire to engineer light-matter interaction in two-dimensional (2D) materials using high-quality resonances in plasmonic and dielectric structures. Here, we demonstrate a link between the radiation control at critical coupling and the metasurface-based bound states in the continuum (BIC) physics, and develop a generalized theory to engineer light absorption of 2D materials in coupling resonance metasurfaces. In a typical example of hybrid graphene-dielectric metasurfaces, we present the manipulation of absorption bandwidth by more than one order of magnitude by simultaneously adjusting the asymmetry parameter of silicon resonators governed by BIC and the graphene surface conductivity while the absorption efficiency maintains maximum. This work reveals the generalized role of BIC in the radiation control at critical coupling and provides promising strategies in engineering light absorption of 2D materials for high-efficiency optoelectronics device applications, e.g., light emission, detection and modulation.

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• Two-Dimensional Material Nanophotonics
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Cited by in corpus (5)

• Enabling infinite $Q$ factors in absorbing optical systems
• Non-Hermitian extended midgap states and bound states in the continuum
• Enhanced light absorption in Tamm metasurface with a bound state in the continuum
• Thermo-optic hysteresis with bound states in the continuum
• Temporal coupled mode theory for high-$Q$ resonances in dielectric metasurfaces