手性聲學(xué)人工材料的設(shè)計(jì)研究.pdf

1、獨(dú)創(chuàng)性聲明本人聲明所呈交的論文是我個(gè)人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過(guò)的研究成果，也不包含為獲得寧夏大學(xué)或其它教育機(jī)構(gòu)的學(xué)位或證書而使用過(guò)的材料。與我一同工作的同志對(duì)本研究所做的任何貢獻(xiàn)均己在論文中作了明確的說(shuō)明并表示了謝意。研究生虢夕壤帆如％年歹月77日關(guān)于論文使用授權(quán)的說(shuō)明本人完全了解寧夏大學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定，即：學(xué)校有權(quán)保留送交

2、論文的復(fù)印件和磁盤，允許論文被查閱和借閱，可以采用影印、縮印或掃描等復(fù)制手段保存、匯編學(xué)位論文。同意寧夏大學(xué)可以用不同方式在不同媒體上發(fā)表、傳播學(xué)位論文的全部或部分內(nèi)容。(保密的學(xué)位論文在解密后應(yīng)遵守此協(xié)議)時(shí)間：≯彤年廠月7r7日時(shí)間：Ⅻ5年，月壤從可守協(xié)矽巾簽名生簽究師研導(dǎo)AbstractRecentl5theresearchonvariouskindsofartificialstructurematerialshaveacquir

3、edfruitfulachievementPhotoniccrystal(PTc)andphononiccrystal(POe)callbeusedtocontrolelectromagnetic(EM)waveandsonicwaveIntheprocess，theperiodicalstructureplaysakeyroleTheperformanceisdifferentfordifferentperiodicalstructu

4、remetarialsParticularlyitisshowsomeinterestingpropertiesforthechiralstructuremetariaisForinstanceEMwaveinthechiralPTcsplitintotwomodesanddisplaysthepolarizationgapsInthisthesis，wearefocusedonthepropertiesofthechiralacous

5、ticartificialsWucturematerialsThedegeneratetransversewavesplitintotwomodeslikeEMwavewhenbringinchiraistructureinsolid／solidPOcInaddition，chiralstructureelasticmetamaterialscanrealizethedoublenegativepropertyandtheeffecti

6、veparameterslifecontrolablethroughadjustingthestructureThesurfacewave(SW)ofthemetamaterialsisrelatedtotheeffectiveparametersWhentheparameterssatisfyspecificcondition，theSWwillOCCurliketheEMwaveItisofgreatsignificancethat

7、inthepracticalapplication，whichisattributedtotheshorterwavelengthandstronglocalizationItcanbreakthediffractionlimitandrealizethesubwavelengthimagingInthefirstchapterofthethesis，wegaveanoutlineofthedevelopmentofthePOeanda

8、cousticmetamaterials(Acmeta)，introducingtheSWandthebackgroundandsignificanceofthethesisInthesecondchapterwepresentthecommonresearchmethodofthePOe，anddescribethetheoryofelastodynamicsbrieflyWearefocusedonthecalculationoft

9、hebandwithMultiplescatteringtheory(MST)FinallywegiveanoutlineofthefiniteelementmethodInthethirdchapteronthegroundofMSTweintroducetheLayerMultiplescatteringtheory(LayerMST)，andthen，designingathree—dimensionchiralstructure

10、withsphericalscattersWeusetheL—MSTcalculatethebandwithdifferentperiodicchirallayersstructureAccordingtothebandstructurewecancometoaconclusionthatthe仃ansversebandsplitintotwopolarizationband，duetothedes廿uctionofthespacesy

11、mmetryinthecrystalstructureLocallyresonantbehaviorofthesamesystemcanbeachievedbyintroducingasoftcoattothespheresThefirsttransversesplitintotwoontheresonantbandgapHoweveritisnotOccurthatthenegativegroupvelocityofthesplitb

12、andWedesignatwodimensionchiralstructureelasticmetamaterialsinfourthchapterBoththeeffectiveparametersofthemetamaterials，effectivemassdensityandeffectivemoduluscanchangetonegativeatthesametimeRealizingthedoublenegativemeta

13、materialswithjustonesingleunitcellAdjustingtheconstructionwillchangetheeffectiveparametersItwillgeneratetheSWwhentheparameterssatisfythecondition五∥=0TheSWiscalledRayleighwaveThedispersioncuYveoftheRayleighwaveissimilarto

14、theSPPofEMwaveThisanalogousacousticalSPPpossessesnumerousvalueofapplicationInthefitthchapterwedesigntheexperimentalschemetodemonstrationtheacousticalSPPandtryingthetestpreliminarilyThesampleisapieceofstainlesssteelplatew