报告摘要：InthistalkIwillpresentsomeofourlatestresearchresultsinthegenerationofcontrollablespindensitydistributionwithinanopticalfocalspotbeyondthediffractionlimit.Usingatime-reversalapproach,therequiredpupilfieldforthegenerationofarbitraryspinorientationattheopticalfocuscanbefoundanalytically.Moreover,itcanbeshownthatthefocalfieldproducedthiswayhasavolumesizebeyondtheclassicaldiffractionlimit.Withthismethod,thespinorientationwithinthefocalspotcanbearbitrarilytuned.Averyspecialsituationariseswhenthespinorientationbecomesorthogonaltotheopticalaxisdirection.Suchanopticalfieldwithpurelytransversespindensityiscalled“photonicwheel”.Experimentalrealizationofthecalculatedpupilfieldilluminationwillbepresented.Applicationsofopticalfocalspotswithdifferentspindensityorientationwillalsobebrieflydiscussed.报告人：詹其文，1991年考入中国科大物理系光电子技术专业，2000年、2002年分获明尼苏达大学电子工程专业硕士、博士学位。2002年至今任教于戴盾大学，现为电子光学系教授，2009年起兼任中国科大物理学院光学与光学工程系客座教授，2011年起兼任南开大学客座教授。主要从事光学及光子学方面的研究与教学工作，尤其在轴对称偏振光束的产生和控制及其纳米光子学、生物光子学、纳米表征中的应用研究中做出了处于世界前沿的工作。负责建立了戴顿大学纳米光学实验室及生物光子学实验室。

Recentlythereisanincreasinginterestinvectorialopticalfieldswithspatiallyvariantamplitude,phaseandpolarizationwithinthebeamcross-section.Theaddeddegreesoffreedomarisingfromtheamplitude,phaseandpolarizationdiversitywithinthebeamcross-sectionenablesscientistsandengineerstobreakthelimitsimposedbyconventionalwisdominmanyapplications.InthistalkIwillgivebriefintroductionofthefundamentalsofvariouscomplexopticalfieldsandtheirmethodsofgeneration.Systematicapproachesusingtheseopticalfieldsforcomprehensivethree-dimensionalfocalfieldengineeringarereviewedandexoticopticalfocalfielddistributionsbeyondthediffractionlimitaredemonstratedasexamples.Fieldmanipulation,focusingandconfinementthroughtheinteractionsofthesecomplexfieldswithnanostructuredmaterialsandsurfacesandtheirapplicationswillalsobepresented.