Optical limiter based on PT-symmetry breaking of reflectionless modes
Abstract
The application of parity–time (PT) symmetry in optics, especially PT-symmetry breaking, has attracted considerable attention as an approach to controlling light propagation. Here, we report optical limiting by two coupled optical cavities with a PT-symmetric spectrum of reflectionless modes. The optical limiting is related to broken PT symmetry due to light-induced changes in one of the cavities. Our experimental implementation involves a three-mirror resonator of alternating layers of ZnS and cryolite with a PT-symmetric spectral degeneracy of two reflectionless modes. The passive optical limiting is demonstrated by measurements of single 532 nm 6 ns laser pulses and thermo-optical simulations. At fluences below 10mJ/cm2, the multilayer exhibits a flattop passband at 532 nm. At higher fluences, laser heating combined with the thermo-optic effect in ZnS leads to cavity detuning and PT-symmetry breaking of the reflectionless modes. As a result, the entire multilayer structure quickly becomes highly reflective, protecting itself from laser-induced damage. The cavity detuning mechanism can differ at much higher limiting thresholds and include nonlinearity.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 29, 2023
- Source ID
- 10.1364/optica.497275
Entities
People
- A. A. Chabanov
- Alice Boschetti
- Diederik Wiersma
- Federico Tommasi
- Francesco Riboli
- Igor Anisimov
- Ilya Vitebskiy
- Rodion Kononchuk
- Stefano Cavalieri
- Suwun Suwunnarat
- Tsampikos Kottos
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Consiglio Nazionale delle Ricerche
- Ente Cassa di Risparmio di Firenze
- Istituto Nazionale di Ricerca Metrologica
- National Science Foundation
- Office of Naval Research
- Simons Foundation
- University of Florence
- University of Texas at San Antonio
- Wesleyan University