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Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters [dataset] Open Access

Non-Hermitian physics is responsible for many of the counter-intuitive effects observed in optics research opening up new possibilities in sensing, polarization control and measurement. A hallmark of non-Hermitian matrices is the possibility of non-orthogonal eigenvectors resulting in coupling between modes. The advantages of propagation mode coupling have been little explored in magneto-optical filters and other devices based on birefringence. Magneto-optical filters select for ultra-narrow transmission regions by passing light through an atomic medium in the presence of a magnetic field. Passive filter designs have traditionally been limited by Doppler broadening of thermal vapors. Even for filter designs incorporating a pump laser, transmissions are typically less than 15\% for sub-Doppler features. Here we exploit our understanding of non-Hermitian physics to induce non-orthogonal propagation modes in a vapor and realize better magneto-optical filters. We construct two new filter designs with ENBWs and maximum transmissions of 181~MHz, 42\% and 128~MHz, 17\% which are the highest figure of merit and first sub-100~MHz FWHM passive filters recorded respectively. This work opens up a range of new filter applications including metrological devices for use outside a lab setting and commend filtering as a new candidate for deeper exploration of non-Hermitian physics such as exceptional points of degeneracy.

Descriptions

Resource type

Dataset

Contributors

Creator: Logue, Fraser D. ¹
Contact person: Logue, Fraser D. ¹
Data collector: Logue, Fraser D. ¹
Editor: Briscoe, Jack D. ¹
Editor: Pizzey, Danielle ¹
Editor: Wraathmall, Steven A. ¹
Editor: Hughes, Ifan G. ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Theoretical Study with Experimental Realisation of Two Filters

Other description

Keyword

Subject

Optics

Location

Language

Cited in

doi:10.48550/arXiv.2303.00081

Identifier

ark:/32150/r2qz20ss53r
doi:10.15128/r2qz20ss53r

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

F.D. Logue

Date Uploaded

2 March 2023, 13:03:11

Date Modified

3 March 2023, 08:03:24

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Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 87398

Last modified: 2023:03:02 13:43:49+00:00

Filename: Supporting Data for Exploting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical Filters.zip

Original checksum: a533721e322273ba477c01fb2d2ea7da