Work

Incident-angle-independent tuning of graphene-enhanced Fano resonances using loss modulation

Year: 2026

Type: article

Abstract: Tunable Fano resonances enable strong and spectrally selective mid-infrared (MIR) absorption, offering opportunities for advanced detection and sensing. However, their pronounced dependence on the incidence angle limits practical use in scenarios where illumination is uncontrolled. We propose an angle-insensitive and dynamically reconfigurable MIR absorber obtained by integrating a graphene sheet with an all-dielectric Fano metasurface. Using coupled-mode theory, we quantify how electrically tunable graphene losses reshape the Fano linewidth and modify the balance between radiative and absorptive channels. Full-wave simulations show that the device is almost entirely insensitive to incident angle, while maintaining narrow linewidth and tunability. These results demonstrate a viable route toward angle-insensitive and reconfigurable MIR absorbers, with potential impact in infrared imaging and environmental or chemical sensing.

Source: Applied Physics Letters

DOI: 10.1063/5.0318321

Authors: Silvia Guadagnini, Alok Ghanekar, Michelle L. Povinelli

Institutions: University of Southern California, University of Maryland, Baltimore County

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funder: Defense Sciences Office, DARPA

Award: G4020545431