Tip-Enhanced Stokes-Anti-Stokes Scattering from Carbyne.

Tip-Enhanced Stokes-Anti-Stokes Scattering from Carbyne.
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来自卡宾的尖端增强斯托克斯 - 反斯托克斯散射

DOI:
10.1021/acs.nanolett.2c00154
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发表时间:
2022-04-27
期刊:
影响因子:
10.8
通讯作者:
Novotny, Lukas
Novotny, Lukas
中科院分区:
材料科学1区
文献类型:
--
作者:
Tschannen, Cla Duri;Frimmer, Martin;Vasconcelos, Thiago L.;Shi, Lei;Pichler, Thomas;Novotny, Lukas

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碳炔是碳原子的线性链,是碳的真正一维同素异形体,也是已知最强的拉曼散射体。在这里,我们使用尖端增强的拉曼散射(TERS),以进一步提高拉曼响应的单碳炔链内的双壁碳纳米管限制。我们观察到的反斯托克斯散射增加了3290倍的反斯托克斯/斯托克斯比相对于远场测量的22倍增强。TERS条件下的反斯托克斯/斯托克斯比的功率依赖性指示由激发声子介导的相干斯托克斯-反斯托克斯散射。共振效应和激光诱导加热的作用进行了讨论,并概述了潜在的机会。
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.
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