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ID:38878734
大小:1.33 MB
页数:13页
时间:2019-06-20
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1、LeTTeRdoi:10.1038/nature22404Robustwirelesspowertransferusinganonlinearparity–time-symmetriccircuitSidAssawaworrarit1,XiaofangYu1&ShanhuiFan1ConsiderableprogressinwirelesspowertransferhasbeenmadeinPT-symmetricsystemsareinvariantunderthejointparityandtherealmofnon-radiativetransfer,whichemploysm
2、agnetic-fieldtimereversaloperation14,15.Inopticalsystems,wherethesymmetrycouplinginthenearfield1–4.Acombinationofcircuitresonanceconditionscanbemetbyengineeringthegain/lossregionsandandimpedancetransformationisoftenusedtohelptoachievetheircoupling,PT-symmetricsystemshaveexhibitedunusualefficien
3、ttransferofpoweroverapredetermineddistanceofaboutproperties16–20.AlinearPT-symmetricsystemsupportstwophases,thesizeoftheresonators3,4.Thedevelopmentofnon-radiativedependingonthemagnitudeofthegain/lossrelativetothecouplingwirelesspowertransferhaspavedthewaytowardsreal-worldstrength.Intheunbroken
4、orexactphase,eigenmodefrequenciesapplicationssuchaswirelesspoweringofimplantablemedicalremainrealandenergyisequallydistributedbetweenthegainanddevicesandwirelesschargingofstationaryelectricvehicles1,2,5–8.lossregions;inthebrokenphase,oneoftheeigenmodesgrowsexpo-However,itremainsafundamentalchal
5、lengetocreateawirelessnentiallywhiletheotherdecaysexponentially.Recently,theconceptpowertransfersysteminwhichthetransferefficiencyisrobustofPTsymmetryhasbeenextensivelyexploredinlaserstructures21–24.againstthevariationofoperatingconditions.HereweproposeTheoretically,theinclusionofnonlineargains
6、aturationintheanalysistheoreticallyanddemonstrateexperimentallythataparity–time-ofaPT-symmetricsystemcausesthatsystemtoreachasteadystatesymmetriccircuitincorporatinganonlineargainsaturationelementinalaser-likefashionthatstillcontainsthefollowingPTsymmetryprovidesrobustwirelesspowertransfer.Ourr
7、esultsshowthatthecharacteristics25,26:theselectionofthelasingfrequencybasedonthattransferefficiencyremainsnearunityoveradistancevariationofofthePTeigenmodeandthecontrolofthesteady-stateintensitiesbyapproximatelyonemetre,withoutthe
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