Abstract
This study elucidates electrically and all-optically controllable random lasers in dye-doped liquid crystals with adding a photoisomerizable dye. The lasing intensities and the energy thresholds of the random lasers can be electrically controlled below the Fréedericksz transition threshold or all-optically controlled sequentially with a two-step exposure of UV and green beams. The below-threshold-electric- and all-optical controllabilities of the random lasers are attributable to the effective change of the spatial fluctuation of the orientational order and thus of the dielectric tensor of LCs by changing the electric-field-aligned order of LCs below the threshold and via the isothermal nematic-isotropic phase transition of LCs, respectively; thereby changing the diffusion constant and thus the scattering strength of the fluorescence photons in their recurrent multiple scattering. This can result in the change in the lasing intensity and thus the energy threshold of the random lasers.
| Original language | English |
|---|---|
| Title of host publication | Emerging Liquid Crystal Technologies VII |
| Volume | 8279 |
| DOIs | |
| Publication status | Published - 2012 |
| Event | Emerging Liquid Crystal Technologies VII - San Francisco, CA, United States Duration: 2012 Jan 22 → 2012 Jan 25 |
Other
| Other | Emerging Liquid Crystal Technologies VII |
|---|---|
| Country | United States |
| City | San Francisco, CA |
| Period | 12-01-22 → 12-01-25 |
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All Science Journal Classification (ASJC) codes
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
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Electrically and all-optically controllable random lasers based on dye-doped liquid crystal films. / Lee, Chia-Rong; Lin, Jia De; Huang, Bo Yuang.
Emerging Liquid Crystal Technologies VII. Vol. 8279 2012. 82790B.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Electrically and all-optically controllable random lasers based on dye-doped liquid crystal films
AU - Lee, Chia-Rong
AU - Lin, Jia De
AU - Huang, Bo Yuang
PY - 2012
Y1 - 2012
N2 - This study elucidates electrically and all-optically controllable random lasers in dye-doped liquid crystals with adding a photoisomerizable dye. The lasing intensities and the energy thresholds of the random lasers can be electrically controlled below the Fréedericksz transition threshold or all-optically controlled sequentially with a two-step exposure of UV and green beams. The below-threshold-electric- and all-optical controllabilities of the random lasers are attributable to the effective change of the spatial fluctuation of the orientational order and thus of the dielectric tensor of LCs by changing the electric-field-aligned order of LCs below the threshold and via the isothermal nematic-isotropic phase transition of LCs, respectively; thereby changing the diffusion constant and thus the scattering strength of the fluorescence photons in their recurrent multiple scattering. This can result in the change in the lasing intensity and thus the energy threshold of the random lasers.
AB - This study elucidates electrically and all-optically controllable random lasers in dye-doped liquid crystals with adding a photoisomerizable dye. The lasing intensities and the energy thresholds of the random lasers can be electrically controlled below the Fréedericksz transition threshold or all-optically controlled sequentially with a two-step exposure of UV and green beams. The below-threshold-electric- and all-optical controllabilities of the random lasers are attributable to the effective change of the spatial fluctuation of the orientational order and thus of the dielectric tensor of LCs by changing the electric-field-aligned order of LCs below the threshold and via the isothermal nematic-isotropic phase transition of LCs, respectively; thereby changing the diffusion constant and thus the scattering strength of the fluorescence photons in their recurrent multiple scattering. This can result in the change in the lasing intensity and thus the energy threshold of the random lasers.
UR - http://www.scopus.com/inward/record.url?scp=84863156121&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863156121&partnerID=8YFLogxK
U2 - 10.1117/12.913961
DO - 10.1117/12.913961
M3 - Conference contribution
SN - 9780819489227
VL - 8279
BT - Emerging Liquid Crystal Technologies VII
ER -