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Optically Transportable Optofluidic Microlasers with Liquid Crystal Cavities Tuned by the Electric Field

SYSNO ASEP	0548609
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Optically Transportable Optofluidic Microlasers with Liquid Crystal Cavities Tuned by the Electric Field
Author(s)	Jonáš, Alexandr (UPT-D)_{RID, SAI, ORCID} Pilát, Zdeněk (UPT-D)_{RID, SAI, ORCID} Ježek, Jan (UPT-D)_{RID, ORCID, SAI} Bernatová, Silvie (UPT-D)_{RID, SAI} Jedlička, Petr (UPT-D)_{RID, SAI} Aas, M. (TR) Kiraz, A. (TR) Zemánek, Pavel (UPT-D)_{RID, SAI, ORCID}
Number of authors	8
Source Title	ACS Applied Materials and Interfaces. - : American Chemical Society - ISSN 1944-8244 Roč. 13, č. 43 (2021), s. 50657-50667
Number of pages	11 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	tunable optofluidic microcavity ; optofluidic laser ; whispering gallery modes ; liquid crystals ; optical trapping ; microfluidics
Subject RIV	BH - Optics, Masers, Lasers
OECD category	Optics (including laser optics and quantum optics)
R&D Projects	ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	LD14069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Method of publishing	Limited access
Institutional support	UPT-D - RVO:68081731
UT WOS	000715852100006
EID SCOPUS	85118796111
DOI	10.1021/acsami.1c11936
Annotation	Liquid crystal microdroplets with readily adjustable optical properties have attracted considerable attention for building reconfigurable optofluidic microsystems for sensing, imaging, and light routing applications. In this quest, development of active optical microcavities serving as versatile integrated sources of coherent light and ultra-sensitive environmental sensors has played a prominent role. Here, we study transportable optofluidic microlasers reversibly tunable by an external electric field, which are based on fluorophore-doped emulsion droplets of radial nematic liquid crystals manipulated by optical tweezers in microfluidic chips with embedded liquid electrodes. Full transparency of the electrodes formed by a concentrated electrolyte solution allows for applying an electric field to the optically trapped droplets without undesired heating caused by light absorption. Taking advantage of independent, precise control over the electric and thermal stimulation of the lasing liquid crystal droplets, we characterize their spectral tuning response at various optical trapping powers and study their relaxation upon a sudden decrease in the trapping power. Finally, we demonstrate that sufficiently strong applied electric fields can induce fully reversible phase transitions in the trapped droplets even below the bulk melting temperature of the used liquid crystal. Our observations indicate viability of creating electrically tunable, optically transported microlasers that can be prepared on-demand and operated within microfluidic chips to implement integrated microphotonic or sensing systems.
Workplace	Institute of Scientific Instruments
Contact	Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
Year of Publishing	2022
Electronic address	https://pubs.acs.org/doi/10.1021/acsami.1c11936

Number of the records: 1