Tip-Enhanced Stokes–Anti-Stokes Scattering from Carbyne Article Swipe

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Carbyne Scattering Stokes problem Stokes parameters Materials science Stokes shift Physics Nanotechnology Chemistry Chemical physics Optics Fluorescence Organic chemistry Thermodynamics Carbene Finite element method Catalysis

Cla Duri Tschannen , Martin Frimmer , Thiago L. Vasconcelos , Lei Shi , Thomas Pichler , Lukáš Novotný ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.1021/acs.nanolett.2c00154 · OA: W4223961045

Carbyne, a linear chain of carbon atoms, is the truly one-dimensional allotrope of carbon and the strongest known Raman scatterer. Here, we use tip-enhanced Raman scattering (TERS) to further enhance the Raman response of a single carbyne chain confined inside a double-walled carbon nanotube. We observe an increase of the anti-Stokes scattering by a factor of 3290 and a 22-fold enhancement of the anti-Stokes/Stokes ratio relative to far-field measurements. The power dependence of the anti-Stokes/Stokes ratio under TERS conditions is indicative of coherent Stokes-anti-Stokes scattering mediated by an excited phonon. The role of resonance effects and laser-induced heating are discussed and potential opportunities are outlined.