Title :
Macroporous Silicon Infiltrated with Liquid Crystals: Director-Field Configuration and Device Applications
Author :
Dyomin, A.A. ; Tkachenko, G.V. ; Tkachenko, V. ; Sukhoivanov, I.A. ; Abbate, G.
Author_Institution :
Kharkov Nat. Univ. of Radio Electron., Kharkov
Abstract :
We present the simulated distribution of the local director of nematic liquid crystal (NLC) which is confined inside cylindrical macropores of the porous silicon. The Frank free energy approach is used to describe the NLC in porous medium. The influence of molecular anchoring strength and external electric field applied is investigated. Bruggeman approximation is used while calculating effective refractive index of each layer in porous silicon multilayer structure. Reflectivity spectrum of the latter is simulated using transfer matrix approach. Electrical tuning range of microcavity designed for resonance at 1330 nm vary from 8.5 nm up to 16 nm for weak and strong surface anchoring conditions respectively.
Keywords :
elemental semiconductors; micro-optics; microcavities; mirrors; nematic liquid crystals; optical multilayers; porous semiconductors; reflectivity; refractive index; silicon; Bruggeman approximation; Frank free energy; Si; cylindrical macropores; director-field configuration; effective refractive index; electrical tuning; external electric field; macroporous silicon; microcavity; molecular anchoring strength; nematic liquid crystal; optical mirrors; porous silicon multilayer; reflectivity spectrum; transfer matrix approach; wavelength 1330 nm; Etching; Liquid crystal devices; Liquid crystals; Microcavities; Optical refraction; Optical sensors; Optical surface waves; Silicon; Surface morphology; Tuning;
Conference_Titel :
Optoelectronic Physics and Technology, 2007. OPT '07. International Workshop on
Conference_Location :
Kharkov
Print_ISBN :
1-4244-1322-2
Electronic_ISBN :
1-4244-1322-2
DOI :
10.1109/OPT.2007.4298521
