Nanoscale probing of thermally excited evanescent fields in an electrically biased graphene by near-field optical microscopy

Kuan Ting Lin, Hirofumi Nema, Qianchun Weng, Sunmi Kim, Kenta Sugawara, Taiichi Otsuji, Susumu Komiyama, Yusuke Kajihara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This paper demonstrates nanoscale infrared thermal imaging in electrically biased bilayer graphene (BLG) by using a scattering-type scanning near-field optical microscope (s-SNOM). s-SNOM provides a noncontact technique to detect the thermally excited electromagnetic evanescent fields (∼21 THz) generated on the surface of a Joule-heated BLG. With increasing bias current, a strong near-field signal appears mainly in the sub-micrometer-sized constricted region. The temperature mapping of the graphene film can be derived from the infrared near-field signals, and shows good agreement with the finite-element simulation. Hence, we prove that s-SNOM is a potential infrared nano-thermography for the graphene device.

Original languageEnglish
Article number096501
JournalApplied Physics Express
Volume13
Issue number9
DOIs
Publication statusPublished - 2020 Sep 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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