ATR-SNOM-Raman spectroscopy

In this study, (1) an ATR-SNOM-Raman equipment was built to obtain topograp hy and SNOM images simultaneously, (2) Raman spectra from copper phthalocya nine (CuPc) were obtained with 600 s without using the resonance effect, (3 ) the optimum conditions to excite the LSP (Localized Surface Plasmon) on t he Ag island films were found, (4) the Raman signal from CuPc (1.5 nm) was enhanced by a factor of ca. 300 using the Ag island film (5 nm), which give s 36 counts/s for ca. 7000 molecules assuming a sampled volume of phi 50 nm x 1.5 nm thickness, and enables us to obtain the Raman spectra in 2 s. At last, (5) SNOM-Raman signal arises from the surface < ca. 2 nm similar to a localized SPP field. (C) 2001 Elsevier Science B.V. All rights reserved.