A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Spatial localization of hotspots in Fano-resonant plasmonic oligomers for surface-enhanced coherent anti-Stokes Raman scattering (2020)

Dutta, A., & Vartiainen, E. M. (2020). Spatial localization of hotspots in Fano-resonant plasmonic oligomers for surface-enhanced coherent anti-Stokes Raman scattering. Journal of the European Optical Society : Rapid Publications, 16, Article 8. https://doi.org/10.1186/s41476-020-00128-5

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Dutta, Arpan; Vartiainen, Erik M.

Lehti tai sarja: Journal of the European Optical Society : Rapid Publications

eISSN: 1990-2573

Julkaisuvuosi: 2020

Volyymi: 16

Artikkelinumero: 8

Kustantaja: Springer

Julkaisumaa: Britannia

Julkaisun kieli: englanti

DOI: https://doi.org/10.1186/s41476-020-00128-5

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/68557

Tiivistelmä

Realization of Fano resonance in plasmonic oligomers is often exploited to design efficient plasmonic substrates for surface-enhanced coherent anti-Stokes Raman scattering. Disk-type Fano-resonant plasmonic oligomers are widely used to enhance the Raman signal of the probe material. Generally, hot spots are generated in those oligomers at different spatial locations at different wavelengths and only a few spatially overlapping hot spots at multiple wavelengths can be achieved with oblique incidence of excitation light. In this work, we proposed hexagonal gold nanoparticle based Fano-resonant plasmonic oligomers that can yield higher number of spatially overlapped hot spots compared to the disk type oligomers even with the normal incidence of excitation light. The oligomers were numerically modelled and optimized for surface-enhanced coherent anti-Stokes Raman scattering with 780 nm pumping and 500–1800 cm− 1 Raman signature region. The Fano lineshape was engineered to ensure near-field energy coupling at pump while enhancing the coherent anti-Stokes Raman signal at the far field. Our computational studies explored the purely electric origin of Fano resonance in those oligomers and provided maximum Raman enhancements of 1012–1013 from them to enable single-molecular level applications. Our findings provide a way to realize fabrication-friendly nanostructures with higher number of spatially localized hotspots for improving the Raman detection sensitivity.

YSO-asiasanat: spektroskopia; pintailmiöt; plasmonit; oligomeeri; nanorakenteet; sironta; resonanssi

Vapaat asiasanat: Fano resonance; plasmonic oligomers; coherent anti-Stokes Raman scattering

Liittyvät organisaatiot

OKM-raportointi: Kyllä

Raportointivuosi: 2020

JUFO-taso: 1