Imperial College London
Alternate

ProfessorStefanMaier

Faculty of Natural Sciences, Department of Physics

Lee-Lucas Chair in Experimental Physics
 
 
 
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Contact

 

+44 (0)20 7594 6063s.maier Website CV

 
 
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Location

 

Huxley 903Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Fu:2022:10.1038/s41565-022-01232-y,
author = {Fu, M and Mota, MPDSP and Xiao, X and Jacassi, A and Guesken, NA and Chen, Y and Xiao, H and Li, Y and Riaz, A and Maier, SA and Oulton, RF},
doi = {10.1038/s41565-022-01232-y},
journal = {Nature Nanotechnology},
pages = {1251--1257},
title = {Near-unity Raman beta-factor of surface-enhanced Raman scattering in a waveguide},
url = {http://dx.doi.org/10.1038/s41565-022-01232-y},
volume = {17},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The Raman scattering of light by molecular vibrations is a powerful technique to fingerprint molecules through their internal bonds and symmetries. Since Raman scattering is weak1, methods to enhance, direct and harness it are highly desirable, and this has been achieved using optical cavities2, waveguides3,4,5,6 and surface-enhanced Raman scattering (SERS)7,8,9. Although SERS offers dramatic enhancements2,6,10,11 by localizing light within vanishingly small hot-spots in metallic nanostructures, these tiny interaction volumes are only sensitive to a few molecules, yielding weak signals12. Here we show that SERS from 4-aminothiophenol molecules bonded to a plasmonic gap waveguide is directed into a single mode with >99% efficiency. Although sacrificing a confinement dimension, we find a SERS enhancement of ~103 times across a broad spectral range enabled by the waveguide’s larger sensing volume and non-resonant waveguide mode. Remarkably, this waveguide SERS is bright enough to image Raman transport across the waveguides, highlighting the role of nanofocusing13,14,15 and the Purcell effect16. By analogy to the β-factor from laser physics10,17,18,19,20, the near-unity Raman β-factor we observe exposes the SERS technique to alternative routes for controlling Raman scattering. The ability of waveguide SERS to direct Raman scattering is relevant to Raman sensors based on integrated photonics7,8,9 with applications in gas sensing and biosensing.
AU  - Fu,M
AU  - Mota,MPDSP
AU  - Xiao,X
AU  - Jacassi,A
AU  - Guesken,NA
AU  - Chen,Y
AU  - Xiao,H
AU  - Li,Y
AU  - Riaz,A
AU  - Maier,SA
AU  - Oulton,RF
DO  - 10.1038/s41565-022-01232-y
EP  - 1257
PY  - 2022///
SN  - 1748-3387
SP  - 1251
TI  - Near-unity Raman beta-factor of surface-enhanced Raman scattering in a waveguide
T2  - Nature Nanotechnology
UR  - http://dx.doi.org/10.1038/s41565-022-01232-y
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000874394200002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.nature.com/articles/s41565-022-01232-y
UR  - http://hdl.handle.net/10044/1/100551
VL  - 17
ER  -
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