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Perova, T. S.
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article
ELECTRO-OPTICAL EFFECT IN COMPOSITE PHOTONIC STRUCTURES BASED ON GROOVED SILICON AND LIQUID CRYSTAL
Abstract
<jats:p> One-dimensional periodic structures with deep vertical grooves were obtained by wet anisotropic etching of (110)-oriented silicon-on-insulator (SOI) structure. Grooves of various widths (4–16 μm) were filled with a nematic liquid crystal (LC) E7. Inter-digital configuration of silicon electrodes was used to apply a voltage which altered the refractive index of the liquid crystal. Reproducible Freedericksz effect with a threshold voltage from 2 to 3 V was registered visually in the polarized light of a microscope and studied by means of micro-Raman spectroscopy. The electro-optical effect in the structures can be used to tune the band gaps of 1D photonic crystals, the spectral response of microcavities and to steer light beams in high contrast planar waveguides and waveguide arrays. </jats:p>