简介:Torsionmicromirrorisakeystructureofopticaldevicesinmicro-electro-mechanicalsystem(MEMS),suchasMEMSopticalswitches,MEMSvariableopticalattenuator,MEMSscanningmicromirrorarrayandsoon.Asilicon-basedNiCrAuMEMStorsionmicromirroristheoreticallyanalyzed.Itisshownthatinordertohave15°rotation,thedrivenvoltageshouldbeabout20Vandthethicknessofthesupportingbeammustbecontrolledintherangeofsubmicronordersofmagnitude.Thisverythinbeammakesthestructuremoreunstableandunreliable,andalsomakesthefabricationmorecomplicated.Basedonparallelback-electrodeanalysisandtesting,atiltedback-electrodehasbeendesignedtoreplacetheparallelback-electrodeinordertodecreasethedrivenvoltageanddifficultyoffabricatingprocessing.Bytheoreticalanalysisandsimulation,aconclusioncanbedrownthatthethicknesscanbeimprovedfromsubmicrontomicronbyusingtiltedback-electrodewhenusingthesamedrivenvoltage.Tiltedback-electrodeisveryeffectivetoimprovethestabilityandreliabilityofthemicromirrorstructure.