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Chiral modes and directional lasing at exceptional points.

Controlling the emission and the flow of light in micro- and nanostructures is crucial for on-chip information processing. Here we show how to impose a strong chirality and a switchable direction of light propagation in an optical system by steering it to an exceptional point (EP)--a degeneracy univ... Full description

Journal Title: Proceedings of the National Academy of Sciences of the United States of America June 21, 2016, Vol.113(25), pp.6845-6850
Main Author: Peng, Bo
Other Authors: Özdemir, Şahin Kaya , Liertzer, Matthias , Chen, Weijian , Kramer, Johannes , Yılmaz, Huzeyfe , Wiersig, Jan , Rotter, Stefan , Yang, Lan
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1091-6490 ; DOI: 10.1073/pnas.1603318113
Link: http://search.proquest.com/docview/1799210178/?pq-origsite=primo
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title: Chiral modes and directional lasing at exceptional points.
format: Article
creator:
  • Peng, Bo
  • Özdemir, Şahin Kaya
  • Liertzer, Matthias
  • Chen, Weijian
  • Kramer, Johannes
  • Yılmaz, Huzeyfe
  • Wiersig, Jan
  • Rotter, Stefan
  • Yang, Lan
subjects:
  • Asymmetric Backscattering
  • Chiral Modes
  • Directional Lasing
  • Exceptional Points
  • Whispering-Gallery-Mode Resonator
ispartof: Proceedings of the National Academy of Sciences of the United States of America, June 21, 2016, Vol.113(25), pp.6845-6850
description: Controlling the emission and the flow of light in micro- and nanostructures is crucial for on-chip information processing. Here we show how to impose a strong chirality and a switchable direction of light propagation in an optical system by steering it to an exceptional point (EP)--a degeneracy universally occurring in all open physical systems when two eigenvalues and the corresponding eigenstates coalesce. In our experiments with a fiber-coupled whispering-gallery-mode (WGM) resonator, we dynamically control the chirality of resonator modes and the emission direction of a WGM microlaser in the vicinity of an EP: Away from the EPs, the resonator modes are nonchiral and laser emission is bidirectional. As the system approaches an EP, the modes become chiral and allow unidirectional emission such that by transiting from one EP to another one the direction of emission can be completely reversed. Our results exemplify a very counterintuitive feature of non-Hermitian physics that paves the way to chiral photonics on a chip. exceptional points | asymmetric backscattering | chiral modes | directional lasing | whispering-gallery-mode resonator
language: eng
source:
identifier: E-ISSN: 1091-6490 ; DOI: 10.1073/pnas.1603318113
fulltext: fulltext
issn:
  • 10916490
  • 1091-6490
url: Link


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titleChiral modes and directional lasing at exceptional points.
creatorPeng, Bo ; Özdemir, Şahin Kaya ; Liertzer, Matthias ; Chen, Weijian ; Kramer, Johannes ; Yılmaz, Huzeyfe ; Wiersig, Jan ; Rotter, Stefan ; Yang, Lan
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subjectAsymmetric Backscattering ; Chiral Modes ; Directional Lasing ; Exceptional Points ; Whispering-Gallery-Mode Resonator
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descriptionControlling the emission and the flow of light in micro- and nanostructures is crucial for on-chip information processing. Here we show how to impose a strong chirality and a switchable direction of light propagation in an optical system by steering it to an exceptional point (EP)--a degeneracy universally occurring in all open physical systems when two eigenvalues and the corresponding eigenstates coalesce. In our experiments with a fiber-coupled whispering-gallery-mode (WGM) resonator, we dynamically control the chirality of resonator modes and the emission direction of a WGM microlaser in the vicinity of an EP: Away from the EPs, the resonator modes are nonchiral and laser emission is bidirectional. As the system approaches an EP, the modes become chiral and allow unidirectional emission such that by transiting from one EP to another one the direction of emission can be completely reversed. Our results exemplify a very counterintuitive feature of non-Hermitian physics that paves the way to chiral photonics on a chip. exceptional points | asymmetric backscattering | chiral modes | directional lasing | whispering-gallery-mode resonator
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