Abstract
We investigated the lasing characteristics of multilayer cholesteric liquid crystal (CLC) structures comprising a dye-doped polymer matrix sandwiched between two films of CLC. Our experiment results were explained in terms of the calculated photonic density of states (DOS). The wavelength of lasing was located at the edge of the overlap between the band gaps of the CLC. Decreasing the thickness of the polymer matrix was shown to lower the threshold energy for lasing because of an increase in the DOS. Furthermore, a shift between the band gaps of the CLC films was shown to reduce the DOS at the lasing wavelength. The inclusion of a nematic liquid crystal layer within a sandwich structure makes it possible to tune the wavelength of lasing.
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