Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss Mie scatterer

Hwaseob Lee; Ali Kecebas; Feifan Wang; Lorry Chang; Sahin K. Özdemir; Tingyi Gu

doi:10.1186/s43593-023-00043-5

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Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss Mie scatterer

eLight Vol. 3, Issue 1, (2023)

RESEARCH ARTICLE | Updated：2024-09-25

- Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss Mie scatterer
- Affiliations：
  
  Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA
  Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA
  Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
- Author bio：
  
  *Sahin K. Özdemirsko9@psu.edu
  Tingyi Gutingyigu@udel.edu
- Funds：
- DOI：10.1186/s43593-023-00043-5
  CLC：
- Published：2023，
  
  Published Online：04 September 2023，
  
  Received：13 February 2023，
  
  Revised：22 March 2023，
  
  Accepted：07 April 2023
- Accepted：
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Hwaseob Lee, Ali Kecebas, Feifan Wang, et al. Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss Mie scatterer. [J]. eLight, 2023,3(1).
DOI：

Hwaseob Lee, Ali Kecebas, Feifan Wang, et al. Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss Mie scatterer. [J]. eLight, 2023,3(1). DOI： 10.1186/s43593-023-00043-5.

摘要

Abstract

Non-Hermitian systems with their spectral degeneracies known as exceptional points (EPs) have been explored for lasing

controlling light transport

and enhancing a sensor's response. A ring resonator can be brought to an EP by controlling the coupling between its frequency degenerate clockwise and counterclockwise traveling modes. This has been typically achieved by introducing two or more nanotips into the resonator's mode volume. While this method provides a route to study EP physics

the basic understanding of how the nanotips' shape and size symmetry impact the system's non-Hermicity is missing

along with additional loss from both in-plane and out-of-plane scattering. The limited resonance stability poses a challenge for leveraging EP effects for switches or modulators

which requires stable cavity resonance and fixed laser-cavity detuning. Here we use lithographically defined asymmetric and symmetric Mie scatterers

which enable subwavelength control of wave transmission and reflections without deflecting to additional radiation channels. We show that those pre-defined Mie scatterers can bring the system to an EP without post tuning

as well as enable chiral light transport within the resonator. Counterintuitively

the Mie scatterer results in enhanced quality factor measured on the transmission port

through coherently suppressing the backscattering from the waveguide surface roughness. The proposed device platform enables pre-defined chiral light propagation and backscattering-free resonances

needed for various applications such as frequency combs

solitons

sensing

and other nonlinear optical processes such as photon blockade

and regenerative oscillators.

关键词

Keywords

Non-HermicityExceptional pointMie scatterersMicroring resonatorSilicon photonics

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