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
Rodrigo Berté (R.Berte@physik.uni-muenchen.de)
Andreas Tittl (Andreas.Tittl@physik.uni-muenchen.de)
收稿日期:2024-09-11,
修回日期:2025-03-10,
录用日期:2025-03-20,
网络出版日期:2025-05-07,
纸质出版日期:2025-07-31
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All-optical permittivity-asymmetric
Berté, R. et al. All-optical permittivity-asymmetric quasi-bound states in the continuum. Light: Science & Applications, 14, 1923-1933 (2025).
All-optical permittivity-asymmetric
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.
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 (
q
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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