A Compact Conical Beam Shaper and Freeform Segmented Reflector for SERS analysis

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3 Citaten (Scopus)
130 Downloads (Pure)


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.

Originele taal-2English
Pagina's (van-tot)16163-16174
Aantal pagina's12
TijdschriftOptics Express
Nummer van het tijdschrift11
StatusPublished - 13 mei 2020

Bibliografische nota

Funding Information:
China Scholarship Council; Fonds Wetenschappelijk Onderzoek (G029919N); Vrije Universiteit Brussel. The authors would like to express their sincere thanks to Michael Vervaeke, Jürgen Van Erps, Kurt Rochlitz and Dries Rosseel for the fabrication of the optical and mechanical components.

Publisher Copyright:
© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Copyright 2020 Elsevier B.V., All rights reserved.


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