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Tip-Enhanced Stokes–Anti-Stokes Scattering from Carbyne

2022; American Chemical Society; Volume: 22; Issue: 8 Linguagem: Inglês

10.1021/acs.nanolett.2c00154

1530-6992

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

Ion-surface interactions and analysis

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.