Micro-Raman and Cathodoluminescence Microscopy and Spectroscopy Zhiheng Liu and Matt DeLong Department of Physics and Astronomy, University of Utah
Micro-RamanandCathodoluminescence
MicroscopyandSpectroscopy
Zhiheng LiuandMattDeLongDepartment ofPhysicsandAstronomy,UniversityofUtah
Micro-RamanandPhotoluminescenceSpectroscopyandMicroscopy
• WiTecAlphaSNOMsystem• Sub-micronspatialresolution• 2D-scancapabilityforspectral
imaging• Multiplelaserlinesfor
excitation
Micro-RamanofGraphene
Sisubstrate
Laser line
Gband
2Dband
Spectralimageofnanowire
Cathodoluminescence inSEM
ApplicationsofCathodoluminescence
• Lightemittingdiodes– Givesemissionspectraasafunctionofpositiononthemicronscale
• Geology– Analysisofzircons,quartzandother luminescentmaterialsonthe
deepsubmicronscale– Infergeologicalhistory
• LuminescenceimagingwithnanoscalespatialresolutionprovidedbySEM.
• Illuminatesstructuresnotvisibleinsecondaryelectronimages.
• Givesdetailedinformationoncomposition(viaspectraandemissionintensities)notpossiblebyothertechniques.
SecondaryElectronImageofZircon
All-LightCLImageofZircon
ZirconEmissionSpectrumfrom300to1000nm