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1、Astudyaboutmulti-trappingofatapered-tipsinglefiberopticaltweezersLIUZhihai,LIANGPcibo,ZHANGYu(KeyLaboratoryofIn-FiberIntegratedOptics,SchoolofScience,HarbinEngineeringUniversity,Harbin150001,China)Abstract:Wedevelopandaccomplishastudyaboutmulti-trappingcharacteristicofataper
2、ed-tipsinglefiberopticaltweezers・Thefinitedifferencetimedomain(FDTD)methodisemployedtosimulatethetrappingforcecharacteristicofthissinglefiberopticaltweezers,andtheresultsshowthatthequantityofthetrappedparticlesdependingontherefractiveindexandthesizeoftheparticles.Besidesthat
3、thetrappingforcesofthistapered-tipsinglefiberopticaltweezershavebeencalibratedbytheexperimentmethod,andtheexperimentalresultsareconsistentwiththetheoreticalcalculationresults.Themulti-trappingcapabilityrealizedbythetapered-tipsinglefiberopticaltweezerswillbepracticalandusefu
4、lforsomeapplicationsinbiomedicalresearchingfields.Keywords:opticaltrapping;microstmcturesandparticles;opticaltweezers;multi-trapping0IntroductionOpticaltweezers(OTs)hadbeenwidelyappliedfornoninvasivemanipulationofavarietyofbiologicalspecimens[i-5]includingviruses,bacteria,ce
5、lls,andsub-cellularorganismsinbiologyandbiophysicsresearchingfieldssinceitwereinventedbyAshkinetalin1986[6).WhenthelightfromOTsisincidentanddeflectedbythesurfaceofanobject,opticalforceswillbeproducedandexertontheobjectduetothephotonmomentumchange.Besidesbiologicalfield,OTsal
6、soofferpowerfulnewpossibilitiestohandlemicroscopicparticlesrevolutionizeddifferentareas,suchasatomicphysics(7-9),chemistryiio,hjandMEMS(Micro-Electro-MechanicalSystems)[12];eventhestudyoftheopticaltrappingitselfresultedininterestingnewphysics(13,uj.Attheoutset,opticaltrappin
7、gisachievedbytraditionallensopticaltweezers,butthebulkystructureandexpensivecostlimititsapplicationsinseveralenvironments,thereforeopticalfibertweezerscomeintobeing.Theearlyfiberopticaltweezersemploytwoormoreopticalfibersguidinglightbeamstobuildalargeenoughlightfieldintensit
8、ygradientdistributionfortrappingfI5,161,whichneedmultihigh-precisionmicroma
