Dynamic modulation of toroidal bound states in the continuum with suppressed continuum energy
Year: 2025
Type: article
Abstract: Bound states in the continuum (BICs) enable ultrahigh- Q photonic resonators critical for advanced optoelectronics, yet their dynamic reconfigurability, particularly modulation depth in single-resonance systems, remains fundamentally limited. We overcome this by synergistically coupling a toroidal dipole quasi-BIC with a Fabry–Pérot resonance in a graphene-integrated metasurface. Through overdamped mode hybridization and graphene’s gate-tunable complex conductivity, the system achieves record modulation depth of 97.7% at 1550 nm while dynamically tuning Q -factors from 240 to 2600. This dual-resonance architecture simultaneously enables spectral agility and critical coupling absorption, resolving the long-standing trade-off between ultrahigh- Q confinement and reconfigurability for intelligent photonic devices.
Source: New Journal of Physics
Authors: Xintong Shi, Feng Deng, Rui Zhou, Yunfei Li, Zihao Yu, Tingting Liu, Hai Lin, Shuyuan Xiao
Institutions: Central China Normal University, Nanchang University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,610
Awards: G1634577003, G3996052253, G4095775939
OpenAlex ID: W4416712400