SNOM技术 在扫描近场光学显微镜中，激发激光聚焦到直径远小于激发波长的小孔，透过针 孔在孔周围产生消逝场（近场）。当样品非常靠近探针时，透射光或反射光的空 间分辨率仅受孔直径的限制，可达到60100nm的近场光学分辨率。通过逐点、逐 行扫描样品表面，可以生成高分辨率近场光学图像。 Excitation laser SNOM Cantilever Near-field with Aperture Surface Far-field
SNOM技术 在扫描近场光学显微镜中，激发激光聚焦到直径远小于激发波长的小孔，透过针 孔在孔周围产生消逝场（近场）。当样品非常靠近探针时，透射光或反射光的空 间分辨率仅受孔直径的限制，可达到60-100 nm的近场光学分辨率。通过逐点、逐 行扫描样品表面，可以生成高分辨率近场光学图像
Schematic Near-Field Microscope Set-up feedback cw Laser control Dither piezo CCD Near-field tip Sample Spectro- X,Y;Z graph Microskope Scanner objektive Dichroic mirror Pinhole Video APD
Schematic Near-Field Microscope Set-up
Near-field Apertures pulled etched/old etched/new 1um 50 um 300n 300nm Stockle et al., Appl.Phys.Lett. Transmission: ~0.0001% ~0.1% 75,161(1999)
Near-field Apertures pulled etched/old etched/new Transmission: ~0.0001% ~0.1% Stöckle et al., Appl. Phys. Lett. 75, 161 (1999)
Investigation of Chemical Reactions using NF-Raman Heterogeneous Catalysis
Investigation of Chemical Reactions using NF-Raman Heterogeneous Catalysis
Heterogenous Catalysis Detection in Laser Reflection e.g.Ar Detection through fiber Further Analysis 一Reactants of Products e.g GC/MS ↓ Detection in Transmission Spectrograph
Heterogenous Catalysis