We demonstrated widely tunable lasing with lowered threshold in a liquid crystal (LC) laser by introducing a nanostructured indium-tin-oxide (ITO) film with two dimensional (2D) periodicity and two kinds of organic dyes in the nematic LC host. From a wedge-shaped distributed feedback (DFB) resonator, thickness of a LC layer and effective refractive indices of guided laser modes are modulated by changing the pumping position spatially, and the lasing emission is tuned by 26 nm. This LC DFB laser with wide spectral tunability and low threshold provides various approaches for practical applications in laser technology.
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Park et al. (2016) studied this question.
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