论文标题
使用连续的绑定状态在连续体中的双重共振光子晶体腔
Doubly resonant photonic crystal cavity using merged bound states in the continuum
论文作者
论文摘要
在这项工作中，提出了使用连续体（BICS）中合并结合状态的双共振光子晶体（PHC）腔，以获得更高的第二次谐波产生（SHG）效率。首先，通过扫描几何参数，可以获得意外的BIC和光锥外部的带边模式。然后，随着晶格常数或平板的厚度调节，意外的BIC将合并。构建了带有大孔和小孔的超级单元，并可以通过合并的BICS模式在光锥外部的带边缘模式进行模式。最后，设计了异质结构PHC腔。合并后的BIC显示出有限尺寸的光子晶体的高质量因子。因此，接近〜6000％W-1的晶格常数的SHG效率高于孤立的BIC之一。
In this work, a doubly resonant photonic crystal (PhC) cavity using the merged bound states in the continuum (BICs) is proposed to obtain a higher second harmonic generation (SHG) efficiency. Firstly by scanning geometry parameters the accidental BICs and a band-edge mode outside the light cone can be obtained. Then as the lattice constant or the thickness of the slab is adjusted the accidental BICs will merge. A supercell with large and small holes is constructed and the band-edge mode outside the light cone can be mode-matched with the merged BICs mode. Finally the heterostructure PhC cavity is designed. The merged BICs show a high quality factor for the photonic crystal with finite size. Consequently, the SHG efficiency of the lattice constant near merged BICs of ~6000% W-1 is higher than the one of the isolated BIC.
