2007
DOI: 10.1063/1.2777153
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Enhanced tunable Bragg diffraction in large-pore inverse opals using dual-frequency liquid crystal

Abstract: Large-pore TiO2 inverse opals were fabricated by atomic layer deposition in sintered polystyrene colloidal crystal templates and infiltrated with dual-frequency liquid crystal. The optical properties of the hybrid organic/inorganic structure were characterized by reflectance measurements of the Bragg peak, the position of which was tuned using a frequency dependent applied electric field. A 6nm blueshift was observed for frequencies less than 13kHz and a 13nm redshift for frequencies above 13kHz. These results… Show more

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Cited by 14 publications
(7 citation statements)
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“…Later, the effect of molecule orientation with respect to the sphere surface was also studied in a similar system 464. Inverse opals have also been studied as tunable electro‐optic devices, employing dual‐frequency LCs which permits increasing the tunability range of the device 465. Inverse opal films filled with LC molecules with incorporated azobencenes have been employed to tune the optical response of the system orienting the LC molecules by means of an external light beam,466 and even using two external stimuli simultaneously –light beams and electric fields– to achieve higher control on the optical response of the sample 467.…”
Section: Functionalitiesmentioning
confidence: 99%
“…Later, the effect of molecule orientation with respect to the sphere surface was also studied in a similar system 464. Inverse opals have also been studied as tunable electro‐optic devices, employing dual‐frequency LCs which permits increasing the tunability range of the device 465. Inverse opal films filled with LC molecules with incorporated azobencenes have been employed to tune the optical response of the system orienting the LC molecules by means of an external light beam,466 and even using two external stimuli simultaneously –light beams and electric fields– to achieve higher control on the optical response of the sample 467.…”
Section: Functionalitiesmentioning
confidence: 99%
“…(1) and the relation n 2 = ε for non-magnetic materials, where n is the refractive index, we can see that the SPP wave vector changes with the refractive index. In this work, the dielectric material is DFLC [29][30][31][32][33][34]. This DFLC material, such as MLC-2048(Merck) used in Ref [35].…”
Section: Principles and Designmentioning
confidence: 99%
“…Such a DFLC can change the sign of dielectric anisotropy between positive and negative when the frequency of the applied electric field changes [41][42][43][44], thus changing the EOT of the hybrid system. By overlaying the DFLC onto the Au nanohole array, we achieved~11% enhancement in transmittance compared to the bare Au nanohole array.…”
Section: Introductionmentioning
confidence: 98%