Substrate-enhanced photothermal nano-imaging of surface polaritons in monolayer graphene
Samuel Berweger, Fabian Menges, Honghua Yang, Tao Jiang, Markus B. Raschke
Surface polaritons comprise a wealth of light-matter interactions with deep subwavelength scale confinement of electromagnetic modes. However, their nanoscale localized dissipation and thermalization processes are not readably accessible experimentally. Here, we introduce photo-thermal force microscopy to image the nonradiative surface plasmon polariton (SPPs) dissipation in monolayer graphene on SiO2. We demonstrate the real-space imaging of SPPs via photo-induced force detection, and by direct comparison with all-optical s-SNOM imaging we attribute this response to substrate dissipation-induced thermal expansion. This work illustrates that tip-sample nanocavity induced dissipative forces facilitate a direct mechanical detection of surface polariton interactions with monolayer sensitivity.
, Menges, F.
, Yang, H.
, Jiang, T.
and Raschke, M.
Substrate-enhanced photothermal nano-imaging of surface polaritons in monolayer graphene, APL Photonics
(Accessed June 10, 2023)