Ultra-compact on-chip slot Bragg grating structure for small electric field detection-中国期刊网

摘要 Inthispaper,wepresentanultra-compact1Dphotoniccrystal(PhC)Bragggratingdesignonathinfilmlithiumniobateslotwaveguide(SWG)via2D-and3D-FDTDsimulations.2D-FDTDsimulationsareemployedtotunethephotonicbandgap(PBG)size,PBGcenter,cavityresonancewavelength,andthewholesizeofPhC.3DFDTDsimulationsarecarriedouttomodeltherealstructurebyvaryingdifferentgeometricalparameterssuchasSWGheightandPhCsize.AmoderateresonancequalityfactorQofabout300isachievedwithaPhCsizeofonly0.5μm×0.7μm×6μm.TheproposedslotBragggratingstructureisthenexploitedasanelectricfield(E-field)sensor.Thesensitivityisanalyzedby3D-FDTDsimulationswithaminimumdetectableE-fieldassmallas23mV∕m.Thepossiblefabricationprocessoftheproposedstructureisalsodiscussed.ThecompactsizeoftheproposedslotBragggratingstructuremayhaveapplicationsinon-chipE-fieldsensing,opticalfiltering,etc.

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Ultra-compact on-chip slot Bragg grating structure for small electric field detection

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Ultra-compact on-chip slot Bragg grating structure for small electric field detection

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