Conformal optical black hole for cavity

Qingtao Ba; Yangyang Zhou; Jue Li; Wen Xiao; Longfang Ye; Yineng Liu; Jin-hui Chen; Huanyang Chen

doi:10.1186/s43593-022-00026-y

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Conformal optical black hole for cavity

eLight Vol. 2, Issue 1, (2022)

RESEARCH ARTICLE | Updated：2024-09-28

- Conformal optical black hole for cavity
- Affiliations：
  
  Institute of Electromagnetics and Acoustics and Department of Physics, College of Physical Science and Technology, Xiamen University, Xiamen 361005, China
  Fujian Provincial Key Laboratory of Electromagnetic Wave Science and Detection Technology, Xiamen 361005, China
- Author bio：
  
  *Jin-hui Chenjimchen@xmu.edu.cn
  Huanyang Chenkenyon@xmu.edu.cn
- Funds：
- DOI：10.1186/s43593-022-00026-y
  CLC：
- Published：2022-12，
  
  Published Online：30 September 2022，
  
  Received：30 June 2022，
  
  Revised：23 August 2022，
  
  Accepted：05 September 2022
- Accepted：
Scan QR Code
Qingtao Ba, Yangyang Zhou, Jue Li, et al. Conformal optical black hole for cavity. [J]. eLight, 2022,2(1).
DOI：

Qingtao Ba, Yangyang Zhou, Jue Li, et al. Conformal optical black hole for cavity. [J]. eLight, 2022,2(1). DOI： 10.1186/s43593-022-00026-y.

摘要

Abstract

Whispering-gallery-mode (WGM) cavity is important for exploring physics of strong light-matter interaction. Yet it suffers from the notorious radiation loss universally due to the light tunneling effect through the curved boundary. In this work

we propose and demonstrate an optical black hole (OBH) cavity based on transformation optics. The radiation loss of all WGMs in the ideal OBH cavity is completely inhibited by an infinite wide potential barrier. Besides

the WGM field in the OBH cladding is revealed to follow 1/

decay rule based on conformal mapping

which is fun-damentally different from the conventional Hankel-function distributions in a homogeneous cavity. Experimentally

a truncated OBH cavity is achieved based on the effective medium theory

and both the Q-factor enhancement and tightly confined WGM fields are measured in the microwave spectra which agree well with the theoretical results. The circular OBH cavity is further applied to the arbitrary-shaped cavities including single-core and multi-core structures with high-Q factor via the conformal mapping. The OBH cavity design strategy can be generalized to resonant modes of various wave systems

such as acoustic and elastic waves

and finds applications in energy harvesting and optoelectronics.

关键词

Keywords

Whispering-gallery-mode cavityOptical black holeTransformation optics

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