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band-gap liquid crystals Seiichi Furumi, Shiyoshi Yokoyama, Akira Otomo, and Shinro Mashiko Abstract: This letter describes the electrical control of
structure and lasing in the photonic bandgaps of
cholesteric liquid crystals (CLCs). Photoexcitation of dye-doped
CLC cells with a linearly
polarized laser gives rise to laser emission at the edge(s) of the
chiral photonic band gap. Applying
voltages to the optically pumped CLC cells enables reversible switching
of the laser action as a result
of the structual changes in the chiral photonic band gap. |