纳米颗粒掺杂的聚合物稳定液晶微管随机激光器性能研究
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摘要
为了优化液晶类微管激光器的性能,拓展其应用领域,本文研究了银纳米颗粒和氧化锌纳米颗粒对染料掺杂聚合物稳定液晶微管激光器出射激光的影响。通过掺杂不同浓度的银纳米颗粒和氧化锌纳米颗粒在聚合物稳定液晶的微管随机激光器中,探究其对微管激光器出射激光特征的影响,并对比两种纳米颗粒的影响效果。实验结果表明:当在聚合物稳定液晶微管激光器中掺入0.1%的银纳米颗粒后,随机激光出射强度增强,其激光阈值从23.2μJ/pulse减小至10.9μJ/pulse。当氧化锌纳米颗粒的掺杂浓度达到1.0%时,在随机激光出射强度增加的同时,激光出射阈值会减小至21.2μJ/pulse。然而,过量纳米颗粒的掺杂均会造成随机激光出射光强的降低和激光阈值的增加,其原因在于纳米颗粒团簇的产生,降低了纳米颗粒的散射作用。实验结果还表明,银纳米颗粒掺杂对微管激光器性能的提升明显优于氧化锌,这归因于银纳米颗粒所引发的局域表面等离共振效应会增强其散射作用。通过掺杂纳米颗粒,微管随机激光器的性能得到了提升,为其在通讯、加密以及液晶显示等领域奠定了基础。
This paper investigated the improvement of random lasing properties based on dye-doped polymer stabilized liquid crystals(DDPSLC)by doping Ag and ZnO nanoparticles(NPs)with different concentrations in capillaries,in order to expand new applications for this device.At first,DDPSLC samples with different dye doping concentrations were prepared in capillary tubes to select an optimum DDPSLC system for doping NPs.After selecting the optimum DDPSLC,some Ag NPs and ZnO NPs with different concentrations were added into the DDPSLC to investigate the effect on the random lasing properties.The experimental results indicate that the random lasing threshold decreased from 23.2μJ/pulse to 10.9μJ/pulse after doping 0.1% Ag NPs into DDPSLC.As the doping concentration of ZnO NPs increased to 1%,the lasing properties can be also improved due to the scattering effect of ZnO NPs,and the lasing threshold of the DDPSLC decreased slightly to 21.2μJ/pulse.As the doping concentrations of NPs continually increased,some NPs clusters can be observed obviously in capillary samples,which have a negative effect on random lasing emission.In addition,doping Ag NPs with optimum concentrations(0.1%)can enhance the random lasing properties more significantly because of the improvement of scattering effect caused by localized surface plasmon resonance(LSPR).The random lasing devices based on DDPSLC containing Ag NPs or ZnO NPs will have widely potential applications in LC display,communications and encryption technology.
This paper investigated the improvement of random lasing properties based on dye-doped polymer stabilized liquid crystals(DDPSLC)by doping Ag and ZnO nanoparticles(NPs)with different concentrations in capillaries,in order to expand new applications for this device.At first,DDPSLC samples with different dye doping concentrations were prepared in capillary tubes to select an optimum DDPSLC system for doping NPs.After selecting the optimum DDPSLC,some Ag NPs and ZnO NPs with different concentrations were added into the DDPSLC to investigate the effect on the random lasing properties.The experimental results indicate that the random lasing threshold decreased from 23.2μJ/pulse to 10.9μJ/pulse after doping 0.1% Ag NPs into DDPSLC.As the doping concentration of ZnO NPs increased to 1%,the lasing properties can be also improved due to the scattering effect of ZnO NPs,and the lasing threshold of the DDPSLC decreased slightly to 21.2μJ/pulse.As the doping concentrations of NPs continually increased,some NPs clusters can be observed obviously in capillary samples,which have a negative effect on random lasing emission.In addition,doping Ag NPs with optimum concentrations(0.1%)can enhance the random lasing properties more significantly because of the improvement of scattering effect caused by localized surface plasmon resonance(LSPR).The random lasing devices based on DDPSLC containing Ag NPs or ZnO NPs will have widely potential applications in LC display,communications and encryption technology.
引文
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[21]叶丽慧,黄玉华,罗吉祥.温度对染料掺杂胆甾相液晶激光波长的影响及应用[J].中国激光,2016,43(1):106002.YEL H,HUANG Y H,LUO J X.Effect of temperature on laser wavelength of dye-doped cholesteric liquid crystal and its applications in temperature sensor[J].Chinese Journal of Lasers,2016,43(1):106002.(in Chinese)
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[23]LI L W,WANG L,DENG L G.Low threshold random lasing in DDPDLCs,DDPDLC@ZnO nanoparticles and dye solution@ZnO nanoparticle capillaries[J].Laser Physics Letters,2014,11(2):025201.
[24]YE L H,LIU B,LI F J,et al.The influence of Ag nanoparticles on random laser from dye-doped nematic liquid crystals[J].Laser Physics Letters,2016,13(10):105001.
[25]郭玉彬,葛璜.光纤Bragg光栅的研究[J].光学精密工程,1999,7(1):31-38.GUO Y B,GE H.Fabrication of fiber Bragg grating[J].Optics and Precision Engineering,1999,7(1):31-38.(in Chinese)
[26]DICE G D,MUJUMDAR S,ELEZZABI A Y.Plasmonically enhanced diffusive and subdiffusive metal nanoparticle-dye random laser[J].Applied Physics Letters,2005,86(13):131105.
[27]SHI X Y,WANG Y R,WANG Z N,et al.Random lasing with a high quality factor over the whole visible range based on cascade energy transfer[J].Advanced Optical Materials,2014,2(1):88-93.
[28]NOGINOV M A,VONDROVA M,WILLIAMS S N,et al.Spectroscopic studies of liquid solutions of R6Glaser dye and Ag nanoparticle aggregates[J].Journal of Optics A:Pure and Applied Optics,2005,7(2):S219-S229.
[29]POPOV O,ZILBERSHTEIN A,DAVIDOV D.Random lasing from dye-gold nanoparticles in polymer films:enhanced gain at the surface-plasmon-resonance wavelength[J].Applied Physics Letters,2006,89(19):191116.
[30]CAO H,ZHAO Y G,HO S T,et al.Random laser action in semiconductor powder[J].Physical Review Letters,1999,82(11):2278-2281.
[2]CAO H.Review on latest developments in random lasers with coherent feedback[J].Journal of Physics A:Mathematical and General,2005,38(49):10497-10535.
[3]张伶莉.光调谐的胆甾相液晶应用的发展[J].液晶与显示,2016,31(11):1023-1032.ZHANG L L.Development of photo-tunable cholesteric liquid crystals applications[J].Chinese Journal of Liquid Crystals and Displays,2016,31(11):1023-1032.(in Chinese)
[4]岱钦,邬小娇,吴杰,等.染料掺杂手性向列相液晶激光器的制备和研究[J].液晶与显示,2014,29(6):922-925.DAI Q,WU X J,WU J,et al.Preparation and research of dye-doped chiral nematic liquid crystal[J].Chinese Journal of Liquid Crystals and Displays,2014,29(6):922-925.(in Chinese)
[5]岱钦,乌日娜,杨健,等.电场作用下染料掺杂液晶器件的激光辐射[J].光学精密工程,2011,19(7):1510-1514.DAI Q,WU R N,YANG J,et al.Laser emission of dye-doped liquid crystal devices under applying voltage[J].Optics and Precision Engineering,2011,19(7):1510-1514.(in Chinese)
[6]张伶莉,孙秀东,刘永军,等.具有外部谐振腔的胆甾相液晶激光器的研究[J].液晶与显示,2013,28(5):679-682.ZHANG L L,SUN X D,LIU Y J,et al.Cholesteric liquid crystals laser with external cavity[J].Chinese Journal of Liquid Crystals and Displays,2013,28(5):679-682.(in Chinese)
[7]岱钦,吴杰,邬小娇,等.染料掺杂聚合物分散胆甾相液晶薄膜激光特性研究[J].物理学报,2015,64(1):016101.DAI Q,WU J,WU X J,et al.Study of laser action in dye-doped polymer dispersed cholesteric liquid crystal film[J].Acta Physica Sinica,2015,64(1):016101.(in Chinese)
[8]CHEN C W,JAU H C,WANG C T,et al.Random lasing in blue phase liquid crystals[J].Optics Express,2012,20(21):23978-23984.
[9]李文萃,郑致刚,刘永刚,等.高对比度低压驱动全息聚合物分散液晶光栅[J].光学精密工程,2010,18(7):1504-1510.LI W C,ZHENG Z G,LIU Y G,et al.High contrast and low threshold holographic polymer dispersed liquid crystal grating[J].Optics and Precision Engineering,2010,18(7):1504-1510.(in Chinese)
[10]WANG L,WANG M,YANG M C,et al.Bichromatic coherent random lasing from dye-doped polymer stabilized blue phase liquid crystals controlled by pump light polarization[J].Chinese Physics B,2016,25(9):094217.
[11]乌日娜,邬小娇,吴杰,等.光子晶体液晶光纤随机激光研究[J].光学学报,2015,35(2):308-312.WU R,WU X J,WU J,et al.Research of laser emission in the photonic liquid crystal fiber[J].Acta Optica Sinica,2015,35(2):308-312.(in Chinese)
[12]YANG C K,ZHANG H,LIU B,et al.Electrically tunable whispering gallery mode microresonator based on a grapefruit-microstructured optical fiber infiltrated with nematic liquid crystals[J].Optics Letters,2017,42(15):2988-2991.
[13]ZITO G,PISSADAKIS S.Holographic polymer-dispersed liquid crystal Bragg grating integrated inside a solid core photonic crystal fiber[J].Optics Letters,2013,38(17):3253-3256.
[14]LIN J H,HSIAO Y L,CIOU B Y,et al.Manipulation of random lasing action from dye-doped liquid crystals infilling two-dimensional confinement single core capillary[J].IEEE Photonics Journal,2015,7(3):1-9.
[15]LIN J H,HSIAO Y L.Manipulation of the resonance characteristics of random lasers from dye-doped polymer dispersed liquid crystals in capillary tubes[J].Optical Materials Express,2014,4(8):1555-1563.
[16]ZHANG J,DAI H T,YAN C,et al.Lasing properties from dye-doped holographic polymer dispersed liquid crystal confined in two-dimensional cylindrical geometry[J].Optical Materials Express,2016,6(4):1367-1375.
[17]CAO M X,ZHANG Y T,SONG X X,et al.Enhanced amplified spontaneous emission in a quantum dot-doped polymer-dispersed liquid crystal[J].Nanotechnology,2016,27(26):26LT01.
[18]LEE C R,LIN J D,HUANG B Y,et al.All-optically controllable random laser based on a dye-doped liquid crystal added with a photoisomerizable dye[J].Optics Express,2010,18(25):25896-25905.
[19]LEE C R,LIN S H,GUO C H,et al.All-optically controllable random laser based on a dye-doped polymer-dispersed liquid crystal with nano-sized droplets[J].Optics Express,2010,18(3):2406-2412.
[20]YE L H,LIU B,ZHAO C,et al.The electrically and magnetically controllable random laser from dye-doped liquid crystals[J].Journal of Applied Physics,2014,116(5):053103.
[21]叶丽慧,黄玉华,罗吉祥.温度对染料掺杂胆甾相液晶激光波长的影响及应用[J].中国激光,2016,43(1):106002.YEL H,HUANG Y H,LUO J X.Effect of temperature on laser wavelength of dye-doped cholesteric liquid crystal and its applications in temperature sensor[J].Chinese Journal of Lasers,2016,43(1):106002.(in Chinese)
[22]WANG J L,ZHANG Y T,CAO M X,et al.Platinum-scatterer-based random lasers from dye-doped polymerdispersed liquid crystals in capillary tubes[J].Applied Optics,2016,55(21):5702-5706.
[23]LI L W,WANG L,DENG L G.Low threshold random lasing in DDPDLCs,DDPDLC@ZnO nanoparticles and dye solution@ZnO nanoparticle capillaries[J].Laser Physics Letters,2014,11(2):025201.
[24]YE L H,LIU B,LI F J,et al.The influence of Ag nanoparticles on random laser from dye-doped nematic liquid crystals[J].Laser Physics Letters,2016,13(10):105001.
[25]郭玉彬,葛璜.光纤Bragg光栅的研究[J].光学精密工程,1999,7(1):31-38.GUO Y B,GE H.Fabrication of fiber Bragg grating[J].Optics and Precision Engineering,1999,7(1):31-38.(in Chinese)
[26]DICE G D,MUJUMDAR S,ELEZZABI A Y.Plasmonically enhanced diffusive and subdiffusive metal nanoparticle-dye random laser[J].Applied Physics Letters,2005,86(13):131105.
[27]SHI X Y,WANG Y R,WANG Z N,et al.Random lasing with a high quality factor over the whole visible range based on cascade energy transfer[J].Advanced Optical Materials,2014,2(1):88-93.
[28]NOGINOV M A,VONDROVA M,WILLIAMS S N,et al.Spectroscopic studies of liquid solutions of R6Glaser dye and Ag nanoparticle aggregates[J].Journal of Optics A:Pure and Applied Optics,2005,7(2):S219-S229.
[29]POPOV O,ZILBERSHTEIN A,DAVIDOV D.Random lasing from dye-gold nanoparticles in polymer films:enhanced gain at the surface-plasmon-resonance wavelength[J].Applied Physics Letters,2006,89(19):191116.
[30]CAO H,ZHAO Y G,HO S T,et al.Random laser action in semiconductor powder[J].Physical Review Letters,1999,82(11):2278-2281.