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Electrical and electronic engineering
We have built Fabry-Pérot resonators based on microstructured silicon and a liquid crystal. The devices exhibit tuning of the resonance peaks over a wide range, with relative spectral shifts of up to Δλ/λ = 10%. In order to achieve this substantial spectral shift, cavity peaks of high order were used. Under applied voltages of up to 15 V, a variation in the refractive index of the nematic liquid crystal E7 from ΔnLC = 0.12 to ΔnLC = 0.17 was observed. These results may have practical applications in the near-, mid and far-infrared range.
Tolmachev, V.A., Melnikov, V.A. ,Baldycheva, A.V., Berwick, K., Perova, T.S. (2012) Electrically tunable fabry-perot resonator based on microstructured si containing liquid crystal. Progress In Electromagnetics Research, Vol. 122, 293-309, 2012. doi:10.2528/PIER11091506
IRCSET, Ireland Postdoctoral Award, the ICGEE Postgraduate Programme and by the Science Foundation Ireland (NAP-94 Programme).