Hou S S, Liu Y, Zhang W X, Zhang X D
Opt Express. 2021 May 10;29(10):15177-15189. doi: 10.1364/OE.423243.
Chiral separation is a crucial step in many chemical synthesis processes, particularly for pharmaceuticals. Here we present a novel method for the realization of both separating and trapping of enantiomers using the dielectric photonic crystal (PhC) slabs, which possess quasi-fourfold degenerate Bloch modes (overlapping double degenerate transverse-electric-like and transverse-magnetic-like modes). Based on the designed structure, a large gradient of optical chirality appears near the PhC slab, leading to the extreme enhancement of chiral optical forces about 3 orders of magnitude larger than those obtained with circularly polarized lights. In this case, our method provides a reference for realizing all-optical enantiopure syntheses.
手性分离是许多化学合成过程中的关键步骤，尤其是在制药领域。在此，我们提出了一种利用介电光子晶体（PhC）平板实现对映体分离和捕获的新方法，该平板具有准四重简并布洛赫模式（重叠的双简并类横向电模式和类横向磁模式）。基于所设计的结构，在光子晶体平板附近出现了大的光学手性梯度，导致手性光学力极大增强，比用圆偏振光获得的手性光学力大3个数量级左右。在这种情况下，我们的方法为实现全光对映体纯合成提供了参考。
