We have demonstrated a microchannel-based, surface-enhanced Raman spectroscopy (SERS) sensing approach for integrated microfluidic analysis developed using standard micro-fabrication technology. Our approach allows high-sensitivity SERS sensing with a comparatively low-excitation optical power intensity and large cross-sectional microchannel for biological cell analysis. Utilizing a microchannel with a cross section of 100 × 70 μm<sup>2</sup>, we achieved a detection limit smaller than 10 nM for rhodamine 6G at an excitation power intensity of 132 W/cm<sup>2</sup>, avoiding any possible heating effects on the sample under investigation. There is great potential for further improvement in the sensitivity of this microchannel-based SERS detection.
Vol. 9, Iss. 3 Virtual Journal for Biomedical Optics
Chun-hong Lai, Li Chen, Gang Chen, Yi Xu, and Chun-yan Wang, "Microchannel-Based Surface-Enhanced Raman Spectroscopy for Integrated Microfluidic Analysis," Appl. Spectrosc. 68, 124-127 (2014)