Non-diffracting states at exceptional points
Abstract
We propose to use exceptional points (EPs) to construct diffraction-free beam propagation and localized power oscillation in lattices. We specifically consider two systems to utilize EPs for diffraction-free beam propagation, one in synthetic gauge lattices and the other in unidirectionally coupled resonators where each resonator individually is capable of creating orbital angular momentum (OAM) beams. In the second system, we introduce the concept of robust and tunable OAM beam propagation in discrete lattices. We show that one can create robust OAM beams in an arbitrary number of sites of a photonic lattice. Furthermore, we report power oscillation at the EP of a non-Hermitian lattice. Our research widens the study and application of EPs in different photonic systems including OAM beams and their associated dynamics in discrete lattices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 05, 2021
- Source ID
- 10.1364/ol.411999
Entities
People
- Cem Yuce
- Hamidreza Ramezani
Organizations
- Army Research Office
- Eskişehir Technical University
- National Science Foundation
- University of Texas Rio Grande Valley