Thermal metasurface with tunable narrowband absorption from a hybrid graphene/silicon photonic crystal resonance
Abstract
We report the design of a tunable, narrowband, thermal metasurface that employs a hybrid resonance generated by coupling a tunable permittivity graphene ribbon to a silicon photonic crystal. The gated graphene ribbon array, proximitized to a high quality factor Si photonic crystal supporting a guided mode resonance, exhibits tunable narrowband absorbance lineshapes (Q > 10,000). Actively tuned Fermi level modulation in graphene with applied gate voltage between high absorptivity and low absorptivity states gives rise to absorbance on/off ratios exceeding 60. We employ coupled-mode theory as a computationally efficient approach to elements of the metasurface design, demonstrating an orders of magnitude speedup over typical finite element computational methods.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 20, 2023
- Source ID
- 10.1364/oe.470198
Entities
People
- Arun Nagpal
- Harry Atwater
- Ming Zhou
- Ognjen Ilic
- Zongfu Yu
Organizations
- California Institute of Technology
- Defense Advanced Research Projects Agency
- Stanford University
- University of Minnesota
- University of Wisconsin–Madison