Circular dichroism of chiral photonic crystals with enclosed defect layer inside

摘要

The circular dicroism is calculated in a one-dimensional chiral soft matter (cholesteric liquid crystal) cells on the presence of an isotropic defect layer. The effects of absorption and gain on circular dichroism are investigated and it is shown that the subject system in some circumstances can work as a low threshold laser, a multi-position trigger, a total widearrow band absorber, or a widearrow band filter/mirror. This work demonstrates the effects of absorption and emission in photonic crystal layers, which offers a novel approach for understanding of tunable soft matter photonic materials.