Controlling the Balance of Photoluminescence and Photothermal Effect in Cyanostilbene‐Based Luminescent Liquid Crystals

2021 ◽  
Author(s):  
Xiang‐Jian Cao ◽  
Wei Li ◽  
Jiahua Li ◽  
Lin Zou ◽  
Xing‐Wang Liu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Photothermal Effect

Optically Controlled Light Propagation in Dye-Doped Nematic Liquid Crystals with Homogeneous Alignment

2011 ◽  
Vol 497 ◽  
pp. 142-146
Author(s):  
Tomoyuki Sasaki ◽  
Kenta Miura ◽  
Hiroshi Ono ◽  
Osamu Hanaizumi
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Absorption Band ◽  
Temperature Variation ◽  
Light Propagation ◽  
Light Signal ◽  
Photothermal Effect ◽  
Absorption Of Light ◽  
Control Light

Light propagation in an optical waveguide fabricated by employing a dye-doped liquid crystal (DDLC) was observed. The propagation of a light signal in the waveguide was varied by irradiation with a control light whose wavelength was in the absorption band of the DDLC. By considering the photothermal effect of the DDLC, which enables the change of the refractive index due to temperature variation based on the absorption of light, we qualitatively explained the observed light propagation and demonstrated manipulation of the propagation.

Optically controlled random lasing based on photothermal effect in dye-doped nematic liquid crystals

2014 ◽  
Vol 41 (10) ◽  
pp. 1436-1441 ◽  
Author(s):  
Huanting Bian ◽  
Fengfeng Yao ◽  
Hai Liu ◽  
Feng Huang ◽  
Yanbo Pei ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Photothermal Effect ◽  
Random Lasing

scholarly journals Electro-optic steering of random laser emission in liquid crystals

2018 ◽  
Vol 10 (4) ◽  
pp. 103 ◽  
Author(s):  
Gaetano Assanto ◽  
Sreekanth Perumbilavil ◽  
Armando Piccardi ◽  
Martti Kauranen
Keyword(s):  
Liquid Crystals ◽  
Optical Switching ◽  
Modulational Instability ◽  
Nematic Liquid Crystals ◽  
Photothermal Effect ◽  
Random Laser ◽  
Spatial Solitons ◽  
Random Lasing ◽  
Electro Optic ◽  
All Optical

Using an external low-frequency electric field applied to dye-doped nematic liquid crystals, we demonstrate that random lasing obtained by optical pumping can be steered in angular direction by routing an all-optical waveguide able to collect the emitted light. By varying the applied voltage from 0 to 2 V, we reduce the walk-off and sweep the random laser guided beam over 7 degrees. Full Text: PDF ReferencesV. S. Letokhov, "Generation of light by a scattering medium with negative resonance absorption," Sov. Phys. JETP 26 (4), 835 (1968). DirectLink H. Cao, J. Y. Xu, D. Z. Zhang, S.-H. Chang, S. T. Ho, E. W. Seelig, X. Liu, and R. P. H. Chang, "Spatial Confinement of Laser Light in Active Random Media," Phys. Rev. Lett. 84 (24), 5584 (2000). CrossRef D. S. Wiersma, "The physics and applications of random lasers," Nature Phys. 4 (5) 359-367 (2008). CrossRef D. Wiersma and S. Cavalieri, "A temperature-tunable random laser," Nature 414, 708-709 (2001). CrossRef G. Strangi, S. Ferjani, V. Barna, A. De Luca, N. Scaramuzza, C. Versace, C. Umeton, and R. Bartolino, "Random lasing and weak localization of light in dye-doped nematic liquid crystals," Opt. Express 14 (17), 7737 (2006). CrossRef G. Strangi, S. Ferjani, V. Barna, A. De Luca, C. Versace, N. Scaramuzza, and R. Bartolino, "Random lasing in dye doped nematic liquid crystals: the role of confinement geometry," SPIE 6587, 65870P (2007) doi: 10.1117/12.722887 CrossRef S. Ferjani, V. Barna, A. De Luca, C. Versace, and G. Strangi, "Random lasing in freely suspended dye-doped nematic liquid crystals," Opt. Lett. 33(6), 557-559 (2008). CrossRef S. Ferjani, L-V. Sorriso, V. Barna, A. De Luca, R. De Marco, and G. Strangi, "Statistical analysis of random lasing emission properties in nematic liquid crystals," Phys. Rev. E 78 (1) 011707 (2008). CrossRef H. Bian, F. Yao, H. Liu, F. Huang, Y. Pei, C. Hou, and X. Sun, "Optically controlled random lasing based on photothermal effect in dye-doped nematic liquid crystals," Liq. Cryst. 41 (10), 1436-1441 (2014) CrossRef C. R. Lee, S. H. Lin, C. H. Guo, S. H. Chang, T. S. Mo, and S. C. Chu, "All-optically controllable random laser based on a dye-doped polymer-dispersed liquid crystal with nano-sized droplets," Opt. Express 18 (3), 2406-2412 (2010) CrossRef S. Perumbilavil, A. Piccardi, O. Buchnev, M. Kauranen, G. Strangi, and G. Assanto, "Soliton-assisted random lasing in optically-pumped liquid crystals," Appl. Phys. Lett. 109(16), 161105 (2016); ibid. 110(1), 1019902 (2017). CrossRef S. Perumbilavil, A. Piccardi, O. Buchnev, M. Kauranen, G. Strangi, and G. Assanto, "All-optical guided-wave random laser in nematic liquid crystals", Opt. Express 25 (5), 4672-4679 (2017). CrossRef S. Perumbilavil, A. Piccardi, R. Barboza, O. Buchnev, M. Kauranen, G. Strangi, and G. Assanto, "Beaming random laser with soliton control," Nature Comm., in press (2018) CrossRef M. Peccianti, C. Conti, G. Assanto, A. De Luca and C. Umeton, "Routing of Anisotropic Spatial Solitons and Modulational Instability in liquid crystals," Nature 432, 733-737 (2004). CrossRef J. Beeckman, K. Neyts and M. Haeltermann, "Patterned electrode steering of nematicons," J. Opt. A - Pure Appl. Opt. 8 (2), 214-220 (2006). CrossRef A. Piccardi, M. Peccianti, G. Assanto, A. Dyadyusha and M. Kaczmarek, "Voltage-driven in-plane steering of nematicons," Appl. Phys. Lett. 94, 091106 (2009). CrossRef R. Barboza, A. Alberucci, and G. Assanto, "Large electro-optic beam steering with Nematicons", Opt. Lett. 36 (14), 2611–2613 (2011). CrossRef A. Piccardi, A. Alberucci, R. Barboza, O. Buchnev, M. Kaczmarek, and G. Assanto, "In-plane steering of nematicon waveguides across an electrically adjusted interface", Appl. Phys. Lett. 100 (25), 251107 (2012). CrossRef Y. V. Izdebskaya, "Routing of spatial solitons by interaction with rod microelectrodes," Opt. Lett. 39(6), 1681-1684 (2014). CrossRef A. Pasquazi, A. Alberucci, M. Peccianti, and G. Assanto, "Signal processing by opto-optical interactions between self-localized and free propagating beams in liquid crystals," Appl. Phys. Lett. 87, 261104 (2005). CrossRef S. V. Serak, N. V. Tabiryan, M. Peccianti and G. Assanto, "Spatial Soliton All-Optical Logic Gates", IEEE Photon. Technol. Lett. 18 (12), 1287-1289 (2006). CrossRef M. Peccianti, C. Conti, G. Assanto, A. De Luca and C. Umeton, "All Optical Switching and Logic Gating with Spatial Solitons in Liquid Crystals," Appl. Phys. Lett. 81(18), 3335-3337 (2002). CrossRef A. Fratalocchi, A. Piccardi, M. Peccianti and G. Assanto, "Nonlinearly controlled angular momentum of soliton clusters," Opt. Lett. 32(11), 1447-1449 (2007). CrossRef Y. Izdebskaya, V. Shvedov, G. Assanto, and W. Krolikowski, Nat. Comm. 8, 14452 (2017). CrossRef M. Peccianti and G. Assanto, "Nematicons," Phys. Rep. 516, 147-208 (2012). CrossRef Y. Izdebskaya, A. Desyatnikov, G. Assanto and Y. Kivshar, "Deflection of nematicons through interaction with dielectric particles," J. Opt. Soc. Am. B 30(6), 1432-1437 (2013). CrossRef U. Laudyn, M. Kwasny, F. Sala, M. Karpierz, N. F. Smyth, and G. Assanto,"Curved solitons subject to transverse acceleration in reorientational soft matter," Sci. Rep. 7, 12385 (2017). CrossRef A. Alberucci, A. Piccardi, M. Peccianti, M. Kaczmarek and G. Assanto, "Propagation of spatial optical solitons in a dielectric with adjustable nonlinearity", Phys. Rev. A 82, 023806 (2010). CrossRef

Observation of Optical Soliton-Like Propagation in Dye-Doped Nematic Liquid Crystals with Homogeneous Alignment

2013 ◽  
Vol 596 ◽  
pp. 139-143 ◽  
Author(s):  
Tomoyuki Sasaki ◽  
Kenta Miura ◽  
Osamu Hanaizumi ◽  
Nobuhiro Kawatsuki ◽  
Hiroshi Ono
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Laser Beam ◽  
Light Propagation ◽  
Nematic Liquid Crystals ◽  
Incident Light ◽  
Absorption Peak ◽  
Photothermal Effect ◽  
Light Power ◽  
Polarization Azimuth

Nonlinear light propagation in a dye-doped liquid crystal (LC) was investigated experimentally. A laser beam with wavelength far from the absorption peak of the material was coupled into an LC cell with homogeneous alignment, and the propagation in the cell was observed. When the polarization azimuth of the incident light was orthogonal to the orientation direction of the LC, soliton-like propagation was obtained for milliwatts of light power in spite of the low absorption. We clarified that the observed nonlinearity is due principally to the photothermal effect enhanced by the dye.

The Structure and Development of Microbodies in the Fat Body and other Tissues of an Insect (Calpodes Ethlius)

1970 ◽  
Vol 28 ◽  
pp. 148-149
Author(s):  
M. Locke ◽  
J. T. McMahon
Keyword(s):  
Electron Microscopy ◽  
Liquid Crystals ◽  
Fat Body ◽  
Competitive Inhibitor ◽  
Dense Core ◽  
Urate Oxidase ◽  
Blood Proteins ◽  
Free Base ◽  
The Core ◽  
The Matrix

The fat body of insects has always been compared functionally to the liver of vertebrates. Both synthesize and store glycogen and lipid and are concerned with the formation of blood proteins. The comparison becomes even more apt with the discovery of microbodies and the localization of urate oxidase and catalase in insect fat body.The microbodies are oval to spherical bodies about 1μ across with a depression and dense core on one side. The core is made of coiled tubules together with dense material close to the depressed membrane. The tubules may appear loose or densely packed but always intertwined like liquid crystals, never straight as in solid crystals (Fig. 1). When fat body is reacted with diaminobenzidine free base and H2O2 at pH 9.0 to determine the distribution of catalase, electron microscopy shows the enzyme in the matrix of the microbodies (Fig. 2). The reaction is abolished by 3-amino-1, 2, 4-triazole, a competitive inhibitor of catalase. The fat body is the only tissue which consistantly reacts positively for urate oxidase. The reaction product is sharply localized in granules of about the same size and distribution as the microbodies. The reaction is inhibited by 2, 6, 8-trichloropurine, a competitive inhibitor of urate oxidase.

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