Silent enhancement of SERS signa without increasing hot spot intensities

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10.1515nanoph-2018-0089.pdf

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2018-10-01

Author

Postaci, Selen
Yildiz, Bilge Can
Bek, Alpan
TAŞGIN, MEHMET EMRE

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Plasmonic nanostructures enhance nonlinear response, such as surface enhanced Raman scattering (SERS), by localizing the incident field into hot spots. The localized hot spot field can be enhanced even further when linear Fano resonances take place in a double resonance scheme. However, hot spot enhancement is limited with the modification of the vibrational modes, the breakdown of the molecule, and the tunneling regime. Here, we present a method which can circumvent these limitations. Our analytical model and solutions of 3D Maxwell equations show that: enhancement due to the localized field can be multiplied by a factor of 10(2)-10(3). Moreover, this can be performed without increasing the hot spot intensity which also avoids the modification of the Raman modes. Unlike linear Fano resonances, here, we create a path interference in the nonlinear response. We demonstrate on a single equation that enhancement takes place due to cancellation of the contributing terms in the denominator of the SERS response. Our method can be implemented on an atomic force microscope tip, decorated (or "contaminated") with appropriate quantum emitters.

Subject Keywords

Fano resonance, Surface enhanced Raman scattering, Hot spot, Nonlinear plasmonics, Plasmon modes

URI

https://hdl.handle.net/11511/38319

Journal

NANOPHOTONICS

DOI

https://doi.org/10.1515/nanoph-2018-0089

Collections

Department of Physics, Article

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Citation Formats

S. Postaci, B. C. Yildiz, A. Bek, and M. E. TAŞGIN, “Silent enhancement of SERS signa without increasing hot spot intensities,” NANOPHOTONICS, pp. 1687–1695, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38319.