Extending the functions of scanning near-field optical microscopy
2014
Advanced optical setups are continuously developed to gain deeper insight into microscopic matter. In this paper
we report the expansion of a home-built parabolic mirror assisted scanning, near-field optical microscope (PMSNOM)
by introducing four complementary functions. 1) We integrated a scanning tunneling feedback function
in addition to an already existent shear-force feedback control mechanism. Hence a scanning tunneling
microscope (STM)-SNOM is realized whose performance will be demonstrated by the tip-enhanced Raman
peaks of graphene sheets on a copper substrate. 2) We integrated an ultrafast laser system into the microscope
which allows us to combine nonlinear optical microscopy with hyperspectral SNOM imaging. This particular
expansion was used to study influences of plasmonic resonances on nonlinear optical properties of metallic
nanostructures. 3) We implemented a polarization angle resolved detection technique which enables us to
analyze the local structural order of α-sexithiophene (α-6T). 4) We combined scanning photocurrent microscopy
with the microscope. This allows us to study morphology related optical (Raman and photoluminescence) and
electrical properties of optoelectronic systems. Our work demonstrates the great potential of turning a SNOM
into an advanced multifunctional microscope.
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