Voigt Exceptional Points in an Anisotropic ZnO-Based Planar Microcavity : Square-Root Topology, Polarization Vortices, and Circularity
(2019) In Physical Review Letters 123(22). p.227401-227401- Abstract
Voigt points represent propagation directions in anisotropic crystals along which optical modes degenerate, leading to a single circularly polarized eigenmode. They are a particular class of exceptional points. Here, we report the fabrication and characterization of a dielectric, anisotropic optical microcavity based on nonpolar ZnO that implements a non-Hermitian system and mimics the behavior of Voigt points in natural crystals. We prove the exceptional-point nature by monitoring the complex-square-root topology of the mode eigenenergies (real and imaginary parts) around the Voigt points. Polarization state analysis shows that these artificially engineered Voigt points behave as vortex cores for the linear polarization and sustain... (More)
Voigt points represent propagation directions in anisotropic crystals along which optical modes degenerate, leading to a single circularly polarized eigenmode. They are a particular class of exceptional points. Here, we report the fabrication and characterization of a dielectric, anisotropic optical microcavity based on nonpolar ZnO that implements a non-Hermitian system and mimics the behavior of Voigt points in natural crystals. We prove the exceptional-point nature by monitoring the complex-square-root topology of the mode eigenenergies (real and imaginary parts) around the Voigt points. Polarization state analysis shows that these artificially engineered Voigt points behave as vortex cores for the linear polarization and sustain chiral modes. Our findings apply to any planar microcavity with broken cylindrical symmetry and, thus, pave the way for exploiting exceptional points in widespread optoelectronic devices such as vertical cavity surface emitting lasers and resonant cavity light emitting diodes.
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- author
- Richter, Steffen LU ; Zirnstein, Heinrich Gregor ; Zúñiga-Pérez, Jesús ; Krüger, Evgeny ; Deparis, Christiane ; Trefflich, Lukas ; Sturm, Chris ; Rosenow, Bernd ; Grundmann, Marius and Schmidt-Grund, Rüdiger
- publishing date
- 2019-11-29
- type
- Contribution to journal
- publication status
- published
- in
- Physical Review Letters
- volume
- 123
- issue
- 22
- pages
- 1 pages
- publisher
- American Physical Society
- external identifiers
-
- pmid:31868411
- scopus:85077155948
- ISSN
- 1079-7114
- DOI
- 10.1103/PhysRevLett.123.227401
- language
- English
- LU publication?
- no
- id
- e2f1a598-e6ee-4977-8f98-2ee05c46149d
- date added to LUP
- 2022-04-19 14:47:26
- date last changed
- 2024-05-18 17:04:43
@article{e2f1a598-e6ee-4977-8f98-2ee05c46149d,
abstract = {{<p>Voigt points represent propagation directions in anisotropic crystals along which optical modes degenerate, leading to a single circularly polarized eigenmode. They are a particular class of exceptional points. Here, we report the fabrication and characterization of a dielectric, anisotropic optical microcavity based on nonpolar ZnO that implements a non-Hermitian system and mimics the behavior of Voigt points in natural crystals. We prove the exceptional-point nature by monitoring the complex-square-root topology of the mode eigenenergies (real and imaginary parts) around the Voigt points. Polarization state analysis shows that these artificially engineered Voigt points behave as vortex cores for the linear polarization and sustain chiral modes. Our findings apply to any planar microcavity with broken cylindrical symmetry and, thus, pave the way for exploiting exceptional points in widespread optoelectronic devices such as vertical cavity surface emitting lasers and resonant cavity light emitting diodes.</p>}},
author = {{Richter, Steffen and Zirnstein, Heinrich Gregor and Zúñiga-Pérez, Jesús and Krüger, Evgeny and Deparis, Christiane and Trefflich, Lukas and Sturm, Chris and Rosenow, Bernd and Grundmann, Marius and Schmidt-Grund, Rüdiger}},
issn = {{1079-7114}},
language = {{eng}},
month = {{11}},
number = {{22}},
pages = {{227401--227401}},
publisher = {{American Physical Society}},
series = {{Physical Review Letters}},
title = {{Voigt Exceptional Points in an Anisotropic ZnO-Based Planar Microcavity : Square-Root Topology, Polarization Vortices, and Circularity}},
url = {{http://dx.doi.org/10.1103/PhysRevLett.123.227401}},
doi = {{10.1103/PhysRevLett.123.227401}},
volume = {{123}},
year = {{2019}},
}