Local strain in monolayer molybdenum disulfide (MoS2) on an evaporated Au surface is studied by scanning tunneling microscopy (STM) induced excitonic luminescence on a length scale of 10 nm.
We study the plasmon modes of gold nanorods (as short
as ∼100
nm) on a nonmetallic conductive substrate using scanning tunneling
microscope-induced light emission (STM-LE) with a nonplasmonic tungsten
tip at room temperature in high vacuum (10–7 mbar).
The far-field light is identified as the radiative decay of plasmon
modes on the nanorods excited by inelastic electron tunneling. The
spatial intensity distributions of the first three longitudinal multipolar
modes on nanorods are spatially resolved on the order of 10–20
nm. These intensity distributions are related to the radiative electromagnetic
local density of states and agree very well with numerical simulations.
We discover that the presence of the tungsten tip with a high-dielectric
constant influences the line shapes of the plasmon spectra and enhances
the strength of the plasmon peaks.
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