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Proceedings Paper

Electric field tuning of ferroelectric liquid-crystal microlaser
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Paper Abstract

We discuss the electric field tuning of ferroelectric liquid crystal microlasers. The microlasers were made of 90:10 wt % mixture of CE3 and CE14 ferroelectric liquid crystals (FLCs), which was doped with ~0.1% Pyrromethene 580 fluorescent dye. The ferroelectric Sm C* phase was observed between 42°C and 74°C. The droplets were embedded into the CYTOP CTX-809A, a polymer with low electric conductivity and high viscosity. Within the temperature range 42-60°C the droplets obtained good homeotropic structure with the perpendicular anchoring of the molecules to the surface of the droplets. When the droplets were illuminated with a 532 nm pulsed laser light, Whispering Gallery Mode lasing was observed. The application of a low frequency electric field induced a red-shift of the WGM resonance peaks. The shift was reversible and had a quadratic dependency on the electric field. The observed tuning range was 4.5 nm for 2 V/μm applied electric field. The observed behaviour is explained by the soliton-like deformation of the helical ferroelectric Sm C* structure in an external electric field.

Paper Details

Date Published: 25 February 2020
PDF: 11 pages
Proc. SPIE 11303, Emerging Liquid Crystal Technologies XV, 113030K (25 February 2020); doi: 10.1117/12.2545802
Show Author Affiliations
Anna V. Ryzhkova, J. Stefan Institute (Slovenia)
Pratibha Ramarao, Raman Research Institute (India)
Maryam Nikkhou, King's College London (United Kingdom)
Igor Muševič, J. Stefan Institute (Slovenia)
Univ. of Ljubljana (Slovenia)

Published in SPIE Proceedings Vol. 11303:
Emerging Liquid Crystal Technologies XV
Liang-Chy Chien; Dirk J. Broer, Editor(s)

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