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Design and analysis of a tunable liquid crystal switch/filter with metallic nano-slits

We present a tunable device with wavelength switching/filtering features using periodic metallic nano-slits integrated with a nematic liquid crystal layer. Electrical tunability is a result of the presence of nematic liquid crystal in the cavity of a device. Resonant wavelength can be fine-tuned in 94-nm intervals by controlling the bias voltage. The present study shows that the performance of the device is dependent strongly on the geometry of nano-slits. Through the optimization of parameters, 23 dB ON–OFF ratio is achieved, which is better compared to other solutions. These characteristics can be used in switching/filtering applications at near-infrared optical communication systems. In addition, the dependence of reflectance spectrum on incident angle suggests that an application is a tunable optical filter for this device.