Measurement of the surface-enhanced coherent anti-Stokes Raman scattering (SECARS) due to the 1574 cm-1 surface-enhanced Raman scattering (SERS) mode of benzenethiol using low-power (<20 mW) CW diode lasers
2013
The surface-enhanced coherent anti-Stokes Raman scattering (SECARS) from a
self-assembled monolayer (SAM) of benzenethiol on a silver-coated surface-enhanced
Raman scattering (SERS) substrate has been measured for the 1574 cm-1
SERS mode. A value of 9.6 ± 1.7×10-14 W was determined for the resonant
component of the SECARS signal using 17.8 mW of 784.9 nm pump laser power and 7.1 mW
of 895.5 nm Stokes laser power; the pump and Stokes lasers were polarized parallel
to each other but perpendicular to the grooves of the diffraction grating in the
spectrometer. The measured value of resonant component of the SECARS signal is in
agreement with the calculated value of 9.3×10-14 W using the measured
value of 8.7 ± 0.5 cm-1 for the SERS linewidth Γ (full width at
half-maximum) and the value of 5.7 ± 1.4×10-7 for the product of the
Raman cross section σSERS and the surface concentration
Ns of the benzenethiol SAM. The xxxx component of the
resonant part of the third-order nonlinear optical susceptibility |3
xlink"
xlink:href="i0003-7028-67-2-132-ilm01.tif"/> | for the 1574
cm-1 SERS mode has been determined to be 4.3 ± 1.1×10-5
cm.g-1.s2. The SERS enhancement factor for the
1574 cm-1 mode was determined to be 3.6 ± 0.9×107 using the
value of 1.8×1015 molecules/cm2 for Ns.
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