標題: | Multi-wavelength laser tuning based on cholesteric liquid crystals with nanoparticles |
作者: | Chen, Sheng-Chieh Lin, Jia-De Lee, Chia-Rong Hwang, Shug-June 影像與生醫光電研究所 Institute of Imaging and Biomedical Photonics |
關鍵字: | cholesteric liquid crystal;nanoparticles;laser;thermally-induced phase separation |
公開日期: | 27-四月-2016 |
摘要: | A controllable multi-wavelength laser from a dye-doped cholesteric liquid crystal (DDCLC) cell is demonstrated by incorporating self-assembled polyhedral oligomeric silsesquioxane (POSS) nanoparticles (NPs). Multi-wavelength lasing emission is achieved by formation of multiple planar domains; this formation is dominantly influenced by the vertical alignment of NP clusters adsorbed on the substrate surface through a rapid thermal annealing process. The multi-wavelength lasing peaks are generated through the resultant effect of multiple longitudinal resonant modes of a Fabry-Perot etalon between the cell substrates and the amplification of fluorescence photons with the resonant wavelengths within the broadening long-wavelength edge of the reflection band of the multi-domain CLC. The amount of multi-wavelength lasing peaks can be controlled by changing the POSS NP concentration and the cooling rate of the cell. Furthermore, thermo-reversible control of the multi-wavelength lasing emission can be attained by controlling the thermally induced phase separation process of the POSS/DDCLC cell via a heating/cooling cyclic process. |
URI: | http://dx.doi.org/10.1088/0022-3727/49/16/165102 http://hdl.handle.net/11536/133418 |
ISSN: | 0022-3727 |
DOI: | 10.1088/0022-3727/49/16/165102 |
期刊: | JOURNAL OF PHYSICS D-APPLIED PHYSICS |
Volume: | 49 |
Issue: | 16 |
顯示於類別: | 期刊論文 |