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• W1593164212 abstract "Linear and non-linear optical properties[1] of liquid crystals (LC) make them extremelyappealing for use in a wide range of different optoelectronic applications other than displays.Their high optical anisotropy (in some cases higher than 0.2) implies large phase shifts invery short optical paths. Furthermore, their strong electro-optic effect allows rapidreorientation of their optical axis with indeed very low voltages in the range of only a few voltand hence compatible with current silicon technology. In particular, this last property makesthem very attractive for low power consumption photonic applications.In this communication, light polarization dependence of channel waveguides made of SiO2/Sigrooves filled with the commercial nematic liquid crystal E7 is shown. Grooves wereobtained by initially wet etching phosphorous-doped (1 0 0) silicon substrates and then bythermally growing SiO2 up to a thickness of about 2 μm[2]. The cross section of the grooveresulted with this method was of trapezoidal shape due to the preferential etching plane ofsilicon at 54.7° with respect to the wafer plane. The upper width of the groove as definedfrom the lithographic mask was 10 μm. The processed silicon substrate was subsequentlyassembled into a typical LC cell with a sodalime glass plate on the top. The inner surface ofthe glass had been previously spin-coated with Nylon 6, which was then rubbed for thealignment of the LC molecules approximately along the grooves. Propagation of infrared laserlight (1550 nm) launched at one end of the waveguide by butt coupling was observed for achannel length of 2 cm. The signal at the output of the waveguide could be also coupled to asecond optical fiber. The guided light showed a good optical confinement both in theory andthe experiment. The simulated output profile by means of a typical beam propagation methodwas found to be very similar to the one grabbed at the output of the waveguide. Furthermore,the experimentally observed polarisation dependence of the light confinement into thewaveguide was correctly predicted from our model. In particular, near infrared input light wascontrolled by using a fiber pigtailed sequence of 1/4wave-1/2wave-1/4wave plates. Ameasurement of light intensity versus the angle of input light polarization will be alsoreported. Such measurement shows that the orthogonal polarization state, for which theoptical electric field “sees” only the lower LC refractive index (ordinary), was suppressed bymore than 20 dB. This was justified by the observed pre-tilt angle of the molecules withrespect to the propagation direction along the channel." @default.
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• W1593164212 date "2006-01-01" @default.
• W1593164212 modified "2023-09-27" @default.
• W1593164212 title "Polarization properties of near-infrared light confined in nematic liquid crystalchannel waveguides embedded in SiO2/Si grooves" @default.
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