Local chirality of optical resonances in ultrasmall resonators.
Local chirality of optical resonances in ultrasmall resonators.
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DOI：
10.1103/physrevlett.108.253902
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发表时间：
2012-01
影响因子：
8.6
通讯作者：
B. Redding;L. Ge;Q. Song;J. Wiersig;G. Solomon;H. Cao
中科院分区：
文献类型：
--
作者：
B. Redding;L. Ge;Q. Song;J. Wiersig;G. Solomon;H. Cao
在具有手征对称几何形状的波长尺度腔中，波动光学效应可以引入局部手征性，即顺时针和逆时针传播的谐振模式的空间分离。我们发现，这种本地的手征的结果在单向激光发射在远场。在存在波导的情况下，局部手性还允许激射模式的定向倏逝波耦合，并且输出方向可以通过沿着腔边界选择耦合位置来改变。我们的研究结果表明，可以利用光学共振的本地手征性来控制输出方向性，提高超小型谐振腔的发射收集效率。
In wavelength-scale cavities with chiral-symmetric geometry, wave optical effects can introduce local chirality, that is, a spatial separation of the clockwise and counterclockwise propagating resonant modes. We show that this local chirality results in unidirectional lasing emission in the far field. In the presence of a waveguide, the local chirality also allows for directional evanescent coupling of the lasing modes, and the output direction can be varied by selecting the coupling position along the cavity boundary. Our results demonstrate that the local chirality of optical resonances can be utilized to control the output directionality and enhance the collection efficiency of emission from ultrasmall resonators.