Work

Enhanced anti-crossing in resonant reflection via structured waveguide gratings

Year: 2025

Type: article

Abstract: Gratings with structured periods allow for a controlled ratio between the strength of optical coupling in different diffraction orders. A structured waveguide grating may produce relatively weak coupling in the first diffraction order leading to sharp mode excitation resonances, while the second order coupling can be strong, resulting in a large anti-crossing that can exceed the spectral width of the mode excitation resonances by an order of magnitude or more. This dramatic revelation of strong coupling turns structured waveguide gratings into a platform for studying strongly coupled systems. Here, we describe the concept of structured period gratings, illustrate it with numerical simulations of resonant reflection, and provide experimental verification using a GaN/sapphire system operating in the mid-IR spectral range.

Source: Optics Express

DOI: 10.1364/oe.575621

Authors: Ivan Avrutsky, Matthew Klein, Shivashankar Vangala, Dennis Walker, Joshua R. Hendrickson

Institutions: United States Air Force Research Laboratory, KBR (United States), Wright-Patterson Air Force Base, U.S. Air Force Research Laboratory Sensors Directorate

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: Air Force Office of Scientific Research, Air Force Research Laboratory