Optical fibre-tip probes for SERS: numerical study for design considerations.
Optical Society of America (OSA)
MetadataShow full item record
Hutter, T., Elliott, S., & Mahajan, S. (2018). Optical fibre-tip probes for SERS: numerical study for design considerations.. Optics express, 26 (12), 15539-15550. https://doi.org/10.1364/oe.26.015539
Enhancement of sub-wavelength optical fields using sub-micron plasmonic probes has found many applications in chemical, material, biological and medical sciences. The enhancement is via localised surface-plasmon resonance (LSPR) which enables the highly sensitive vibrational-spectroscopy technique of surface-enhanced Raman scattering (SERS). Combining SERS with optical fibres can allow the monitoring of biochemical reactions in-situ with high resolution. Here, we study the electromagnetic-field enhancement of a tapered optical fibre-tip coated with gold nanoparticles (AuNPs) using finite-element simulations. We investigate the electric-field enhancement associated with metallic NPs and study the effect of parameters such as tip-aperture radius, cone angle, nanoparticle size and gaps between them. Our study provides an understanding for the design and application of metal-nanoparticle-coated optical-fibre-tip probes for SERS. The approach of using fibre-coupled delivery adds flexibility and simplifies the system requirements in SERS, making it suitable for cellular imaging and mapping bio-interfaces.
Trinity College, Cambridge for a PhD studentship Darwin College, Cambridge for a Henslow Research Fellowship
Embargo Lift Date
External DOI: https://doi.org/10.1364/oe.26.015539
This record's URL: https://www.repository.cam.ac.uk/handle/1810/278704
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
Recommended or similar items
The following licence files are associated with this item: