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説明:

Graphene-based photonic structures have emerged as fertile ground for the controlled manipulation of surface plasmon polaritons (SPPs), providing a two-dimensional platform with low optoelectronic losses. In principle, nanostructuring graphene can enable further confinement of nanolightenhancing light-matter interactions in the form of SPP cavity modes. In this study, we engineer nanoscale plasmonic cavities composed of self-assembled C60 arrays on graphene. Using scattering-type scanning near-field optical microscopy (s-SNOM) in conjunction with first-principles density functional theory (DFT) calculations, we show that C60 assemblies behave as molecular plasmonic cavities, giving rise to precisely defined hole-doped regions within continuous samples of graphene. By tuning the deposition conditions of C60, the lateral dimensions of molecular cavities can be tailored to the SPP wavelength. Finite-element simulations verify the existence of SPP cavity modes, revealing a real-space pattern characteristic of confined SPPs. Thus, our study provides a straightforward scheme for tailoring SPP mode volume by leveraging molecular self-assembly.

権利情報:

• In Copyright
  

  This document is the Accepted Manuscript version of a Published Article that appeared in final form in Nano Letters, copyright © 2025 American Chemical Society. To access the final published article, see https://doi.org/10.1021/acs.nanolett.5c03062.

キーワード: Graphene, Surface plasmon polaritons (SPPs), Scanning near-field optical microscopy (s-SNOM)

刊行年月日: 2025-09-24

出版者: American Chemical Society (ACS)

掲載誌:

• Nano Letters (ISSN: 15306984) vol. 25 issue. 38 p. 14043-14050

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology
• Basic Energy Sciences DE-SC0019443
• Core Research for Evolutional Science and Technology JPMJCR24A5
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Japan Science and Technology Agency

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.nanolett.5c03062

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更新時刻: 2026-07-29 10:51:19 +0900

MDRでの公開時刻: 2026-09-11 14:26:04 +0900