The 79th JSAP Autumn Meeting, 2018

Presentation information

Oral presentation

4 JSAP-OSA Joint Symposia 2018 » 4.1 Plasmonics and Nanophotonics

[18a-211B-1~7] 4.1 Plasmonics and Nanophotonics

Tue. Sep 18, 2018 9:15 AM - 11:45 AM 211B (211-2)

Prabhat Verma(Osaka Univ.)

10:15 AM - 10:30 AM

[18a-211B-5] Plasmon activated forbidden phonon modes in defect-free graphene by tip-enhanced nano-confined light

〇(PC)Maria Balois1, Norihiko Hayazawa1,2,3,4, Satoshi Yasuda5, Katsuyoshi Ikeda6, Bo Yang2, Emiko Kazuma2, Yasayuki Yokota2, Yousoo Kim2, Takuo Tanaka1,4,7 (1.RIKEN - RAP, 2.RIKEN - SISL, 3.NIP - UP Diliman, 4.Tokyo Inst. of Tech., 5.JAEA, 6.Nagoya Inst. of Tech, 7.RIKEN - Mets Lab)

Keywords:tip-enhanced Raman spectroscopy, graphene

High photon confinement and the field gradient effect can alter selection rules in Raman spectroscopy. We report the first observation of the forbidden combination Raman modes in defect-free monolayer graphene on an Au(111) substrate whose Raman peak lies at 2919.1 cm-1.The occurrence of the forbidden combination Raman modes alongside the D and D’ modes is due to the nano confined light generated at the tip apex that, in turn, generates a strong field gradient.