Title:	Electric field tuning of ferroelectric liquid-crystal microlaser
Authors:	Ryzhkova, A. V. Pratibha, R. Nikkhouc, Maryam Muševič, Igor
Keywords:	liquid crystals microlasers electric field tuning mode splitting
Issue Date:	Feb-2020
Publisher:	SPIE - The International Society for Optics and Photonics
Citation:	Proceedings of the SPIE, 2020, Vol.11303, p113030K, Emerging Liquid Crystal Technologies XV, edited by Liang-Chy Chien
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.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/7529
ISSN:	0277-786X
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2020SPIE11303E..0KR/abstract https://doi.org/10.1117/12.2545802
Copyright:	2020, SPIE
Appears in Collections:	Research Papers (SCM)

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