title: All-optically controllable dye-doped liquid crystal infiltrated photonic crystal fiber.
abstract: A novel demonstration of an all-optically controllable dye-doped liquid crystal infiltrated photonic crystal fiber (DDLCIPCF) is presented. Overall spectral transmittance of the DDLCIPCF can decrease and then increase with a concomitant red-shift of the spectrum curve with increasing irradiation time of one UV beam. Continuing irradiation of one green beam following UV illumination on the DDLCIPCF can cause the transmission spectrum to recover completely. The reversible all-optical controllability of the photonic band structure of the fiber is attributable to the isothermal planar nematic (PN)→scattering (S)→isotropic (I) and I→S→PN state transitions of the LCs via the UV-beam-induced trans→cis and green-beam-induced cis→trans back isomerizations of the azo-dye, respectively, in the cladding of the DDLCIPCF. The photoinduced appearance of the S state and the variation of the index modulation between the core and the cladding of the fiber result in the variation of overall spectral transmittance and the shift of transmission spectrum, respectively.
authors.affiliation: Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701, Taiwan. crlee@mail.ncku.edu.tw
authors.forename: Chia-Rong
authors.initials: CR
authors.lastname: Lee
authors.forename: Jia-De
authors.initials: JD
authors.lastname: Lin
authors.forename: Yan-Jhen
authors.initials: YJ
authors.lastname: Huang
authors.forename: Shih-Chan
authors.initials: SC
authors.lastname: Huang
authors.forename: Shih-Hung
authors.initials: SH
authors.lastname: Lin
authors.forename: Chin-Ping
authors.initials: CP
authors.lastname: Yu