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-Apr-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
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