All-optical tuning of symmetry protected quasi bound states in the continuum
All-optical tuning of symmetry protected quasi bound states in the continuum
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DOI：
10.1063/1.5116031
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发表时间：
2019-09-30
影响因子：
4
通讯作者：
Brener, Igal
中科院分区：
文献类型：
--
作者：
Karl, Nicholas;Vabishchevich, Polina P.;Brener, Igal
我们证明了破对称GaAs超表面连续共振中高质量因子准束缚态的全光开关。通过稍微破坏GaAs纳米谐振器的对称性，我们使连续介质（bic）中的对称保护束缚态泄漏到自由空间，从而产生高质量因子（类似于500）的尖锐光谱共振。我们用超快光泵浦在800 nm调谐得到的准bic共振，观察到共振的10 nm光谱蓝移，泵浦影响小于100 μ J cm（-2）。光谱位移是在超快的时间尺度(
We demonstrate all-optical switching of high quality factor quasibound states in the continuum resonances in broken symmetry GaAs metasurfaces. By slightly breaking the symmetry of the GaAs nanoresonators, we enable leakage of symmetry protected bound states in the continuum (BICs) to free space that results in sharp spectral resonances with high quality factors of similar to 500. We tune the resulting quasi-BIC resonances with ultrafast optical pumping at 800 nm and observe a 10 nm spectral blue shift of the resonance with pump fluences of less than 100 mu J cm(-2). The spectral shift is achieved in an ultrafast time scale (