Abstract
Among the exotic forms of silicon, microchannel silicon stands out due to its double-crystal structure, with an additional mesoscopic crystal lattice, and unusual optical properties in contrast to bulk crystals and thin films. A number of non-trivial effects have been observed in visible light, such as 2D diffraction, 2D spectral dispersion, high optical transmission, optical anisotropy, and conoscopic figures. Experiment, calculation, and 3D simulation show that microchannel silicon becomes optically transparent with , optically uniaxial with an anisotropic ratio of , and fully spectrum dispersive, and its weight is reduced five times as compared to conventional crystalline silicon.
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