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1、©2007OSA/META2007TuB30.pdfa50_1.pdf3DTunableHexagonalPhotonicCrystalintheUltravioletrange*XiaoHongSun,XiaoMingTaoInstituteofTextilesandClothing,TheHongKongPolytechnicUniversity,HungHom,Kowloon,HongKong*Correspondenceauthor:Tel:0852-98464938,Fax:0852-27731432Email:tcsunxh@polyu.edu.hkAbstract:A
2、top-cuthexagonprismisdesignedforfabrication3DhexagonalPhCstructuresinHPDLCfilms.ThePBGalongzdirectionisintheUVrange.Far-fielddiffractionpatternsandelectricalswitchingcharacteristicshavebeeninvestigated.OCIScodes:090.2880,160.21001.IntroductionThePBGexhibitinginPhCsareveryattractiveforlaser,swi
3、tching,reflectivedisplaysandotherrelateduses[1,2].Overthepastfewyears,muchattentionhasbeenfocusedon2Dand3Dperiodicstructuresinholographicpolymerdispersedliquidcrystal(H-PDLC)materials[3]becauseoftheiradvancedelectro-opticswitchingcapability.[4–7]Severallatticestypeshavebeenproven,includingthef
4、acecenteredcubic[4,8]transversesquare,[9]orthorhombic,[10]anddiamond-likelattices[11].Additionally,2Dand3Dphotonicquasi-crystalstructureshavealsobeeninvestigated[12-14].Inpreviouspapers,multiplebeamsformingtheinterferencepatternwereobtainedbytwoindependentopticalelementsandsteps:Splittingthela
5、seroutputintomultiplebeamseitherbyadielectricbeamsplitteroragrating[15]andthensuperposingthemattheexposurearea.Thisfabricationstrategycanintroducealignmentcomplexityandinaccuraciesduetodifferencesintheopticalpathlengthandanglesamongtheinterferingbeamsaswellasvibrationalinstabilitiesintheoptica
6、lsetup.Recently,atop-cuttriangularprismandfour-beaminterferenceisusedtofabricate3Dinfraredface-centered-cubicPhCinphoto-resistfilm[16].Thesetupisverysimple,stableandeasytoadjust.Here,weusepreviouslydesignedtop-cuthexagonalprism[17]torealizethefabricationoflarge-area2(about1cm)3D(twelvebeamsint
7、erference)hexagonalPhCinHPDLCfilm.PBGalongthezdirectionisadjustedtotheUVrange.2.InterferencePatternbyASingle-prismHolographyThebasicconfigurationofthewritingsystemisarefractiveprism,comprisingsixidenticalsidefacesandtwodifferent-sizedhe
