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时间:2020-05-24
《纳米银掺杂的液晶/聚合物全息光栅中的表面等离子体共振.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、激与电字学进展51,021603(2014)Laser&0ptoelectr0nicsProgress~2014(中国激光》杂志社纳米银掺杂的液晶/聚合物全息光栅中的表面等离子体共振王康妮郑继红桂坤张梦华郭彩虹韦晓鹏上海理工大学光电信息与计算机工程学院教育部光学仪器与系统工程研究中心上海市现代光学系统重点实验室,上海200093摘要报道了纳米银颗粒的局域表面等离子体共振能显著提高全息聚合物分散液晶(H-PDLC)光栅的衍射效率。着重分析了球形纳米银颗粒在PDLC中的表面等离子体共振特性,根据Mie理论,模拟计算了球形纳米银颗粒在PDLC材料中
2、的消光光谱并得出了相应的表面等离子体共振峰值,且该值与用光谱仪测得的材料吸收峰值相近。同时,根据准静态近似理论,模拟了球形纳米银颗粒在特定波长的光照射下的球内外电场分布。证明了球形纳米银颗粒在聚合物分散液晶材料中发生表面等离子体共振,当用与共振峰值相近的激光对材料进行曝光时,可以增强液晶与聚合物的相分离过程,所制备的光栅样品结构更加整齐平滑,从而提高了光栅的衍射效率。关键词材料;表面等离子体共振;纳米银;聚合物分散液晶;全息光栅中图分类号O438.1文献标识码Adoi:10.3788/LOP51.021603SurfacePlasmonRes
3、onanceofH0l0graphicPolymerDispersedLiquidCrystalGratingDopedwithNano。_AgWangKangniZhengJihongGuiKunZhangMenghuaGuoCaihongWeiXiaopengShanghaiKeyLaboratoryofModernOpticalSystem,EngineeringResearchCenterofOpticalInstrumentandSystem,MinistryofEducation,SchoolofOptical—Electrica
4、landComputerEngineering,UniversityofShanghaiforScienceandTechnology,Shanghai200093,ChinaAbstractTheeffectoflocalizedsurfaceplasmonresonanceofAgnanoparticlesonthediffractioneficiencyofholographicpolymerdispersedliquidcrystalgratingrH—PDLC)isreported.Thesurfaceplasmonresonanc
5、echaracteristicofsphericalAgnanoparticleswithinthePDLCmaterialisanalyzed.AccordingtoMietheory.theextinctionspectraofsphericalAgnanoparticlessurroundedbyPDLCmaterialaresimulatedandthentheresonancewavelengthisfoundintheextinctionspectra,whichisverysimilartotheresonancewavelen
6、gthvaluemeasuredbyspectrometer.Inaddition,theelectricfielddistributioninsideandoutsidethesphericalAgnan0particlesissimulatedaccordingtoquasi—staticapproximationmethod.ItistestifiedthatAgnanoparticlesexhibitsurfaceplasmonresonanceinthePDLCmaterialduringholographicrecordingpr
7、ocess,thusthephaseseparationbetweenliquidcrystalandpolymerissignificantlyimprovedandthegratingstructureismuchsmootherthanthesamplewithoutAgnan0partic1es,whichgreatlyincreasesthediffractionefficiencyofH—PDLCgrating.Keywordsmaterials;surfaceplasmonresOnance:nanO—Ag;polymerdis
8、persedliquidcrystal;holographicgratingoCIScodes160.4236;160.3710;240.6680;090.7330
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