Abstract
We present a Raman spectroscopy setup containing a conical beam shaper in combination with a freeform segmented reflector for surface enhanced Raman scattering (SERS) analysis. The freeform segmented reflector and the conical beam shaper are designed by numerical approaches and fabricated by means of ultra-precision diamond tooling. The segmented reflector has a numerical aperture of 0.984 and a working distance of 1mm for SERS measurements. We perform systematic simulations using non-sequential ray tracing to assess the detecting abilities of the designed SERS-based system. We implement a proof-of-concept setup and demonstrate the confocal behavior by measuring the SERS signal of 10µM rhodamine B solution. The experimental results agree well with the simulations concerning the misalignment tolerances of the beam shaper with respect to the segmented reflector and the misalignment tolerances of the collecting fiber. In addition, we conduct benchmark SERS measurements by using a 60× objective lens with a numerical aperture of 0.85. We find that the main Raman intensity of rhodamine B at 1502 cm-1 obtained by our segmented reflector working together with the conical beam shaper is approximately 30% higher compared to the commercial objective lens.
Highlights
Raman spectroscopy is a powerful non-linear optical detection technique which was first discovered in 1928 by Sir C.V
We present a Raman spectroscopy setup containing a conical beam shaper in combination with a freeform segmented reflector for surface enhanced Raman scattering (SERS) analysis
We find that the main Raman intensity of rhodamine B at 1502 cm−1 obtained by our segmented reflector working together with the conical beam shaper is approximately 30% higher compared to the commercial objective lens
Summary
Raman spectroscopy is a powerful non-linear optical detection technique which was first discovered in 1928 by Sir C.V. The sag of the marginal segments of this reflector is relatively large To this end, we developed a freeform segmented reflector design to reduce the dimensions and used in combination with a conical beam shaper for SERS measurements. Our freeform segmented reflector has a high NA and a long working distance in comparison with commercial achromatic and apochromatic objective lenses. The performance of our conical beam shaper and freeform segmented reflector were assessed by non-sequential ray tracing simulations and compared to the experimental results obtained
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