# Investigation of Defect Modes of Chiral Photonic Crystals

## TL;DR

This paper studies the behavior of defect modes in cholesteric liquid crystal photonic crystals, analyzing how layer thickness and gain affect their optical properties and potential for low-threshold lasing.

## Contribution

It provides new insights into the dependence of defect mode properties on layer thickness and gain in cholesteric liquid crystals, with implications for designing high-Q microcavities.

## Key findings

- Maximum density of states at defect mode for thin layers
- Peaks at band gap edges for thick layers and high gain
- Potential for low-threshold lasing and high-Q microcavities

## Abstract

Some properties of defect modes of cholesteric liquid crystals (CLC) are presented. It is shown that when the CLC layer is thin the density of states and emission intensity are maximum for the defect mode, whereas when the CLC layer is thick, these peaks are observed at the edges of the photonic band gap. Similarly, when the gain is low, the density of states and emission intensity are maximum for the defect mode, whereas at high gains these peaks are also observed at the edges of the photonic band gap. The possibilities of low-threshold lasing and obtaining high-Q microcavities have been investigated.

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Source: https://tomesphere.com/paper/1705.02376