Abstract
SummaryA new low‐temperature scanning tunneling microscopy technique with laser optics allows for optical excitation and spectroscopy at the level of a single atom or molecule.Shape and material of the microscope's tip prove essential for these investigations; thus, the tip is produced with nanoscale precision by Focused Ion‐Beam milling. The localized surface plasmon properties of the tips are engineered by altering the tip structures providing spectral tunability. Local optical excitation is performed by a wavelength‐tunable laser source. This tip‐enhanced resonance Raman spectroscopy provides a new approach for the atomic‐scale optical characterization of local electron‐phonon coupling and could ultimately lead to new nanoscale optoelectronic devices with exceptional high sensitivity and efficiency.
Highlights
A new low-temperature scanning tunneling microscopy technique with laser optics allows for optical excitation and spectroscopy at the level of a single atom or molecule
In order to produce very sharp tips with nanoscale precision (Fig. 2a), we have developed a nanofabrication method using a focused ion beam
We demonstrated that the scanning tunneling microscope junction allows direct observation of plasmon-driven reactions [10, 11]
Summary
Nanolight originates from localized surface plasmon excitation in metallic nanostructures. It possesses great potential for local optical spectroscopy down to the single-molecule level and for the enhancement of photophysical and photochemical processes such as solar energy conversion and photocatalytic reactions. Plasmonic nanogaps formed between metallic nanoparticles are of particular interest to fundamental physics and applications because of an extreme field enhancement (Fig. 1a). They enable single-molecule detection as well as an enhancement of photophysical and photochemical processes by orders of magnitude. 500 550 hv e vation of plasmon-induced phenomena in such tiny gaps remains challenging because conventional microscopy and spectroscopy can‘t uncover the microscopic structures and dynamics in detail due to insufficient spatial resolution
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