Compact conical beam shaper and freeform segmented reflector for SERS analysis
Optics Express, ISSN: 1094-4087, Vol: 28, Issue: 11, Page: 16163-16174
2020
- 4Citations
- 10Captures
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
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Article Description
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 obtained by our segmented reflector working together with the conical beam shaper is approximately 30% higher compared to the commercial objective lens.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85085517454&origin=inward; http://dx.doi.org/10.1364/oe.391623; http://www.ncbi.nlm.nih.gov/pubmed/32549444; https://opg.optica.org/abstract.cfm?URI=oe-28-11-16163; https://dx.doi.org/10.1364/oe.391623; https://opg.optica.org/oe/fulltext.cfm?uri=oe-28-11-16163&id=431772
Optica Publishing Group
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