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

IF 20.6 Q1 OPTICS
Rodrigo Berté, Thomas Possmayer, Andreas Tittl, Leonardo de S. Menezes, Stefan A. Maier
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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 (qBICs). 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 and 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.

Abstract Image

全光介电常数-连续介质中的非对称准束缚态
共振通常与有限系统有关,如吉他中固定弦的振动或由镜子定义的腔中的光学模式。在光学中,共振可以在无限连续介质中通过对其光学性质的周期性调制而产生。在这里,我们证明了无特征薄膜的介电常数的周期性调制也可以作为一种对称破缺机制,允许在连续介质(qbic)中激发光子准束缚态。通过在无界薄膜中干扰两个超短激光脉冲,可以通过不同的泵浦光束参数来定制瞬态共振。我们证明了该系统提供了波长和质量因子可调的共振,以及频谱选择性增强的三次谐波产生。由于介电常数不对称的快速衰减,我们观察到超快动力学,实现了皮秒精度的时间选择性近场增强。光诱导介电常数不对称可以在按需弱到超强光-物质相互作用机制和在无光刻的超表面中动态选择波长的光操纵中得到利用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Light-Science & Applications
Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II :电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学
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803
审稿时长
2.1 months
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