All-optical permittivity-asymmetric <italic style="font-style: italic">quasi</italic>-bound states in the continuum

Rodrigo Berté; Thomas Possmayer; Andreas Tittl; Leonardo de S. Menezes; Stefan A. Maier

doi:10.1038/s41377-025-01843-9

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All-optical permittivity-asymmetric quasi-bound states in the continuum

Original Articles

- All-optical permittivity-asymmetric quasi-bound states in the continuum
- Light: Science & Applications Vol. 14, Issue 7, Pages: 1923-1933(2025)
- Affiliations：
  
  1.Chair in Hybrid Nanosystems, Nanoinstitut München, Fakultät für Physik, Ludwig-Maximilians-Universität München, München 80799, Germany
  2.Departamento de Física, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil
  3.School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
  4.The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK
- Author bio：
  
  Rodrigo Berté (R.Berte@physik.uni-muenchen.de)
  Andreas Tittl (Andreas.Tittl@physik.uni-muenchen.de)
- Funds：
- DOI：10.1038/s41377-025-01843-9
  CLC：
- Received：11 September 2024，
  
  Revised：10 March 2025，
  
  Accepted：20 March 2025，
  
  Published Online：07 May 2025，
  
  Published：31 July 2025
- Accepted：
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Berté, R. et al. All-optical permittivity-asymmetric quasi-bound states in the continuum. Light: Science & Applications, 14, 1923-1933 (2025).
DOI：

Berté, R. et al. All-optical permittivity-asymmetric quasi-bound states in the continuum. Light: Science & Applications, 14, 1923-1933 (2025). DOI： 10.1038/s41377-025-01843-9.

摘要

Abstract

Resonances are usually associated with finite systems—the vibrations of clamped strings in a guitar or the optical modes in a cavity defined by mirrors. In optics

resonances may be induced in infinite continuous media via periodic modulations of their optical properties. Here we demonstrate that periodic modulations of the permittivity of a featureless thin film can also act as a symmetry-breaking mechanism

allowing the excitation of photonic

quasi

-bound states in the continuum (

BICs). By interfering two ultrashort laser pulses in the unbounded film

transient resonances can be tailored through different parameters of the pump beams. We show that the system offers resonances tunable in wavelength a

nd quality-factor

and spectrally selective enhancement of third-harmonic generation. Due to a fast decay of the permittivity asymmetry

we observe ultrafast dynamics

enabling time-selective near-field enhancement with picosecond precision. Optically induced permittivity asymmetries may be exploited in on-demand weak to ultrastrong light-matter interaction regimes and light manipulation at dynamically chosen wavelengths in lithography-free metasurfaces.

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references

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All-optical permittivity-asymmetric quasi-bound states in the continuum

DOI：10.1038/s41377-025-01843-9

摘要

Abstract

关键词

Keywords

references