Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators

Hwaseob Lee; Lorry Chang; Ali Kecebas; Dun Mao; Yahui Xiao; Tiantian Li; Andrea Alù; Sahin K. Özdemir; Tingyi Gu

doi:10.1038/s41377-024-01686-w

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Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators

Original Articles

- Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators
- Light: Science & Applications Vol. 14, Issue 2, Pages: 401-410(2025)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA
  2.Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA
  3.Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA
  4.Physics Program, Graduate Center, City University of New York, New York, NY 10016, USA
  5.Department of Electrical and Computer Engineering, Saint Louis University, Saint Louis, MO 63103, USA
- Author bio：
  
  Andrea Alù (aalu@gc.cuny.edu)
  Sahin K. Özdemir (sahin.ozdemir@slu.edu)
  Tingyi Gu (tingyigu@udel.edu)
- Funds：
- DOI：10.1038/s41377-024-01686-w
  CLC：
- Received：15 May 2024，
  
  Revised：05 November 2024，
  
  Accepted：2024-11-08，
  
  Published Online：09 January 2025，
  
  Published：28 February 2025
- Accepted：
Scan QR Code
Lee, H. et al. Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators. Light: Science & Applications, 14, 401-410 (2025).
DOI：

Lee, H. et al. Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators. Light: Science & Applications, 14, 401-410 (2025). DOI： 10.1038/s41377-024-01686-w.

摘要

Abstract

Exceptional points (EPs) have been extensively explored in mechanical

acoustic

plasmonic

and photonic systems. However

little is known about the role of EPs in tailoring the dynamic tunability of optical devices. A specific type of EPs known as chiral EPs has recently attracted much attention for controlling the flow of light and for building sensors with better responsivity. A recently demonstrated route to chiral EPs via lithographically defined symmetric Mie scatterers on the rim of resonators has not only provided the much-needed mechanical stability for studying chiral EPs

but also helped reduce losses originating from nanofabrication imperfections

facilitating the in-situ study of chiral EPs and their contribution to the dynamics and tunability of resonators. Here

we use asymmetric Mie scatterers to break the rotational symmetry of a microresonator

to demonstrate deterministic thermal tuning across a chiral EP

and to demonstrate EP-mediated chiral optical nonlinear response and efficient electro-optic tuning. Our results indicate asymmetric electro-optic modulation with up to 17 dB contrast at GHz and CMOS-compatible voltage levels. Such wafer-scale nano-manufacturing of chiral electro-optic modulators and the chiral EP-tailored tunning may facilitate new micro-resonator functionalities in quantum information processing

electromagnetic wave control

and optical interconnects.

关键词

Keywords

references

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