Uniformly-Distributed Energy Losses in Photonic Gratings Enabled by Exceptional Points in Band Diagrams

Alexander Yulaev, Sangsik Kim, Qing Li, Daron A. Westly, Brian J. Roxworthy, Kartik Srinivasan, Vladimir Aksyuk

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Non-Hermitian systems manifesting degeneracy in both eigenvectors and eigenvalues - exceptional points (EPs) - demonstrate exotic phenomena in many fields and have been used to distinguish lasing modes, control light propagation, increase the resonator sensitivity to perturbations, show loss-induced transparency and non-reciprocal light transmission and propagation [1] , [2]. By proper tuning photonic grating dimensions, EPs can be observed in band diagrams [3] , [4]. Lately, systems with EPs have been reported to show constant-intensity solutions. However, decay-free fields in systems with EPs have been experimentally demonstrated only in macro-scale acoustical waveguides [5]. We report here uniformly-distributed energy losses experimentally observed in photonic gratings with ≈ 50 % duty cycle (DC), which operate between EPs in their band diagram. The losses are accompanied by projecting a decay-free free-space beam profile, even though the photonic structure is excited only from one side. Both the finite element method (FEM) and a coupled-mode theory (CMT) strongly agree with experimental findings.

Original languageEnglish
Title of host publication2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665418768
DOIs
StatePublished - Jun 2021
Event2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021 - Munich, Germany
Duration: Jun 21 2021Jun 25 2021

Publication series

Name2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Conference

Conference2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
Country/TerritoryGermany
CityMunich
Period06/21/2106/25/21

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