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Issue 14, 2018
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Improving Luttinger-liquid plasmons in carbon nanotubes by chemical doping

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Abstract

We realized the real-space imaging of Luttinger-liquid plasmons in semiconducting single-walled carbon nanotubes (s-SWCNTs) and studied the effects of chemical-doping-induced charge carrier density modulation on plasmons. Using scattering-type scanning near-field optical microscopy (s-SNOM), we compared the Luttinger-liquid plasmonic behavior in pre- and post-HNO3-doped SWCNTs. Raman measurements revealed that the physical mechanism is P-type doping. Through HNO3 doping, we effectively increased the charge carrier density in s-SWCNTs and achieved quantum plasmons simultaneously with strong confinement (λ0/λp ≈ 70) and high quality factor (Q ≈ 20). The combination of high quality factor and strong subwavelength confinement in Luttinger-liquid plasmons is critical to the future application of plasmonic devices.

Graphical abstract: Improving Luttinger-liquid plasmons in carbon nanotubes by chemical doping

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Article information


Submitted
12 Jan 2018
Accepted
06 Mar 2018
First published
07 Mar 2018

Nanoscale, 2018,10, 6288-6293
Article type
Communication

Improving Luttinger-liquid plasmons in carbon nanotubes by chemical doping

X. Tian, Q. Gu, J. Duan, R. Chen, H. Liu, Y. Hou and J. Chen, Nanoscale, 2018, 10, 6288
DOI: 10.1039/C8NR00310F

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