Graphene Absorption Enhanced by Quasi‐Bound‐State‐in‐Continuum in Long‐Wavelength Plasmonic–Photonic System
Abstract
Graphene plasmonic structures can support enhanced and localized light–mater interactions within extremely small mode volumes. However, the external quantum efficiency of the resulting devices is fundamentally limited by material scattering and radiation loss. Here, such radiation loss channels are suppressed by tailoring the structure to support a symmetry‐protected bound‐state‐in‐the‐continuum (BIC) system. With practical loss rates and doping level in graphene, over 90% absorption near critical coupling is expected from numerical simulation. Experimentally measured peak absorption of 68% is achieved in such a tailored graphene photonic–plasmonic system, with maximum 50% contrast to the control sample without graphene. Significant reduction of the plasmon absorption for a different spacer thickness verifies the sensitivity of the system to the quasi‐BIC condition.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 07, 2022
- Source ID
- 10.1002/adom.202201193
Entities
People
- Andrea Alù
- Anishkumar Soman
- Feifan Wang
- Karl Booksh
- Marcie Wiggins
- Thomas Kananen
- Tingyi Gu
- Zi Wang
Organizations
- Air Force Office of Scientific Research
- City University of New York
- Simons Foundation
- University of Delaware