Multi-wavelength laser tuning based on cholesteric liquid crystals with nanoparticles

Sheng Chieh Chen, Jia De Lin, Chia Rong Lee, Shug June Hwang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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-Pérot 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.

Original languageEnglish (US)
Article number165102
JournalJournal of Physics D: Applied Physics
Volume49
Issue number16
DOIs
StatePublished - Mar 22 2016

Keywords

  • cholesteric liquid crystal
  • laser
  • nanoparticles
  • thermally-induced phase separation

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