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.
Highlights
Pumped pulse Lasing outputFluorescence/Reflectance CLCRBFluorescence of laser dye (Active medium) SWE Wavelength LWE
This work demonstrates an omni-directional lasing emission in a photonic crystal fiber (PCF) which is selectively injected with dye-doped cholesteric liquid crystal (DDCLC) and azo-CLC into the hollow core and the cladding holes, respectively
Experimental results indicate that the helical axis of the DDCLC will align perpendicularly to the fiber wall and the band edge lasing emission of the DDCLC within the PCF can be pumped by a pulse laser and measured in radial direction
Summary
Chung-Yueh Chiu1, Jia-De Lin1, Ting-Shan Mo2, and Chia-Rong Lee1* This work demonstrates an omni-directional lasing emission in a photonic crystal fiber (PCF) which is selectively injected with dye-doped cholesteric liquid crystal (DDCLC) and azo-CLC into the hollow core and the cladding holes, respectively.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
