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SERS Microscopy: Laser Illumination Effects

Volume 45, Number 4 (May 1991) Page 543-545

McGlashen, Michael L.; Guhathakurta, Urmi; Davis, Kevin L.; Morris, Michael D.


Hadamard transform SERS microscopy of pyridine at Ag electrodes with focused 514.5-nm, 532.0-nm, and 632.8-nm excitation is reported. It is shown that focused 514.5-nm and 532.0-nm laser excitation produces photochemical or photothermal damage at roughened Ag electrodes. Photo-damage limits the spatial resolution of SERS microprobe and raster-scanned point imaging techniques which use focused green excitation at Ag electrodes.