Reverse mode switching of the random laser emission in dye doped liquid crystals under homogeneous and inhomogeneous electric fields

2016 ◽  
Vol 4 (1) ◽  
pp. 7 ◽  
Author(s):  
M. Shasti ◽  
P. Coutino ◽  
S. Mukherjee ◽  
A. Varanytsia ◽  
T. Smith ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Laser Emission ◽  
Mode Switching ◽  
Random Laser ◽  
Reverse Mode

Thermally switchable photonic band-edge to random laser emission in dye-doped cholesteric liquid crystals

2018 ◽  
Vol 15 (3) ◽  
pp. 035002 ◽  
Author(s):  
Lihua Ye ◽  
Yan Wang ◽  
Yangyang Feng ◽  
Bo Liu ◽  
Bing Gu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Laser Emission ◽  
Band Edge ◽  
Random Laser ◽  
Cholesteric Liquid Crystals ◽  
Photonic Band

scholarly journals Lens shape liquid crystals in electric fields

2021 ◽  
pp. 116085
Author(s):  
Zoltán Karaszi ◽  
Péter Salamon ◽  
Ágnes Buka ◽  
Antal Jákli
Keyword(s):  
Liquid Crystals ◽  
Electric Fields

Using random laser emission to investigate the bonding energy of laser dye dimers

2008 ◽  
Vol 464 (4-6) ◽  
pp. 245-248 ◽  
Author(s):  
C. Tolentino Dominguez ◽  
Emerson de Lima ◽  
P.C. de Oliveira ◽  
F. López Arbeloa
Keyword(s):  
Laser Emission ◽  
Bonding Energy ◽  
Random Laser ◽  
Laser Dye

Orientational elastic deformations in polymer liquid crystals induced by electric fields: Aromatic polyesters

1993 ◽  
Vol 29 (7) ◽  
pp. 1003-1012 ◽  
Author(s):  
V.N. Tsvetkov ◽  
N.V. Tsvetkov ◽  
L.N. Andreeva ◽  
A.Yu. Bilibin ◽  
S.S. Skorokhodov
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Elastic Deformations ◽  
Polymer Liquid ◽  
Polymer Liquid Crystals ◽  
Aromatic Polyesters

scholarly journals Photoluminescence of CdSe/ZnS quantum dots in nematic liquid crystals in electric fields

2018 ◽  
Vol 9 ◽  
pp. 1544-1549 ◽  
Author(s):  
Margarita A Kurochkina ◽  
Elena A Konshina ◽  
Daria Khmelevskaia
Keyword(s):  
Quantum Dots ◽  
Liquid Crystals ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Electric Fields ◽  
Dielectric Anisotropy ◽  
Vertical Position ◽  
Decay Times ◽  
Pl Intensity

We have experimentally investigated the effect of the reorientation of a nematic liquid crystal (LC) in an electric field on the photoluminescence (PL) of CdSe/ZnS semiconductor quantum dots (QDs). To the LC with positive dielectric anisotropy, 1 wt % QDs with a core diameter of 5 nm was added. We compared the change of PL intensity and decay times of QDs in LC cells with initially planar or vertically orientated molecules, i.e., in active or passive LC matrices. The PL intensity of the QDs increases four-fold in the active LC matrix and only 1.6-fold in the passive LC matrix without reorientation of the LC molecules. With increasing electric field strength, the quenching of QDs luminescence occurred in the active LC matrix, while the PL intensity did not change in the passive LC matrix. The change in the decay time with increasing electric field strength was similar to the behavior of the PL intensity. The observed buildup in the QDs luminescence can be associated with the transfer of energy from LC molecules to QDs. In a confocal microscope, we observed the increase of particle size and the redistribution of particles in the active LC matrix with the change of the electric field strength. At the same time, no significant changes occurred in the passive LC matrix. With the reorientation of LC molecules from the planar in vertical position in the LC active matrix, quenching of QD luminescence and an increase of the ion current took place simultaneously. The obtained results are interesting for controlling the PL intensity of semiconductor QDs in liquid crystals by the application of electric fields.

Random laser emission from a paper-based device

2013 ◽  
Vol 1 (48) ◽  
pp. 8128 ◽  
Author(s):  
Ilenia Viola ◽  
Neda Ghofraniha ◽  
Antonella Zacheo ◽  
Valentina Arima ◽  
Claudio Conti ◽  
...  
Keyword(s):  
Laser Emission ◽  
Random Laser

Evaluation of mechanical behavior of soft tissue by means of random laser emission

2013 ◽  
Vol 84 (10) ◽  
pp. 104301 ◽  
Author(s):  
J. C. Briones-Herrera ◽  
N. Cuando-Espitia ◽  
F. M. Sánchez-Arévalo ◽  
J. Hernández-Cordero
Keyword(s):  
Soft Tissue ◽  
Mechanical Behavior ◽  
Laser Emission ◽  
Random Laser
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