Abstract
Raman scattering signal can be enhanced through localization of incident field into sub-wavelength hot-spots through plasmonic nanostructures (surface-enhanced raman scattering—SERS). Recently, further enhancement of SERS signal via quantum objects are proposed by Postaci (Nanophotonics 7:1687, 2018) without increasing the hot-spot intensity (silent-enhancement) where this suggestion prevents the modification of vibrational modes or the breakdown of molecules. The method utilizes path interference in the nonlinear response of Stokes-shifted Raman modes. In this work, we extend this phenomenon to tune the spectral position of silent-enhancement factor where the multiple vibrational modes can be detected with a better signal-to-noise ratio, simultaneously. This can be achieved in two different schemes by employing either (i) graphene structures with quantum emitters or (ii) replacing quantum emitters with graphene spherical nano-shell in Postaci (Nanophotonics 7:1687, 2018). In addition, the latter system is exactly solvable in the steady-state. These suggestions not only preserve conventional nonlinear Raman processes but also provide flexibility to enhance (silently) multiple vibrational Raman modes due to the tunable optical properties of graphene.
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Ramazan Sahin, Mehmet Emre Tasgin, Asli Gencaslan and Taner Tarik Aytas acknowledge support from TUBITAK-Project No. 121F030.
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Gencaslan, A., Aytas, T.T., Asif, H. et al. Silent-enhancement of multiple Raman modes via tuning optical properties of graphene nanostructures. Eur. Phys. J. Plus 137, 1330 (2022). https://doi.org/10.1140/epjp/s13360-022-03560-3
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DOI: https://doi.org/10.1140/epjp/s13360-022-03560-3