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A Compact Conical Beam Shaper and Freeform Segmented Reflector for SERS analysis. / Liu, Qing; Stenbæk Schmidt, Micheal; Thienpont, Hugo; Ottevaere, Prof. Dr. Ir. Heidi.

In: Optics Express, Vol. 28, No. 11, 13.05.2020, p. 16163-16174.

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Liu, Qing ; Stenbæk Schmidt, Micheal ; Thienpont, Hugo ; Ottevaere, Prof. Dr. Ir. Heidi. / A Compact Conical Beam Shaper and Freeform Segmented Reflector for SERS analysis. In: Optics Express. 2020 ; Vol. 28, No. 11. pp. 16163-16174.

BibTeX

@article{8f3b27706ba5475588cad8260a373b9b,
title = "A Compact Conical Beam Shaper and Freeform Segmented Reflector for SERS analysis",
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.",
author = "Qing Liu and {Stenb{\ae}k Schmidt}, Micheal and Hugo Thienpont and Ottevaere, {Prof. Dr. Ir. Heidi}",
year = "2020",
month = "5",
day = "13",
doi = "https://doi.org/10.1364/OE.391623",
language = "English",
volume = "28",
pages = "16163--16174",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "11",

}

RIS

TY - JOUR

T1 - A Compact Conical Beam Shaper and Freeform Segmented Reflector for SERS analysis

AU - Liu, Qing

AU - Stenbæk Schmidt, Micheal

AU - Thienpont, Hugo

AU - Ottevaere, Prof. Dr. Ir. Heidi

PY - 2020/5/13

Y1 - 2020/5/13

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85085517454&partnerID=8YFLogxK

U2 - https://doi.org/10.1364/OE.391623

DO - https://doi.org/10.1364/OE.391623

M3 - Article

VL - 28

SP - 16163

EP - 16174

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 11

ER -

ID: 52386664