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Raman signal enhancement via multi-probe detection
1Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361005, China.
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Raman spectroscopy is limited by weak scattering and inefficient photon collection, especially for rough and heterogeneous samples. Here, a multi-probe detection strategy is proposed to simultaneously acquire Raman signals from multiple angles, thereby enhancing the Raman signal and suppressing signal fluctuations. Compared with conventional single-probe detection, the multi-probe configuration exhibits higher signal intensity and improved stability, with a more pronounced enhancement observed for powder samples. Electromagnetic simulations reveal that multi-directional detection effectively collects Raman photons that are otherwise lost in the single-probe detection geometries. As a practical demonstration, a signal enhancement of up to 63% is observed for melamine powder samples. The multi-probe scheme extends the SERS detection limit of 4-aminothiophenol (ATP) on rough substrates to 10-7 mol/L. At this concentration, the relative standard deviation (RSD) reduction is over 57%. This work provides a simple and effective approach for improving sensitivity and reliability in Raman spectroscopy.
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