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Free keywords:
Physics, Optics, physics.optics
Abstract:
Super-resolution microscopy in the visible is an established powerful tool in
several disciplines. In the infrared (IR) spectral range, however, no
comparable schemes have been demonstrated to date. In this work, we
experimentally demonstrate super-resolution microscopy in the IR range
(λIR≈ 10-12 μm) using IR-visible sum-frequency generation.
We operate our microscope in a wide-field scheme and image localized surface
phonon polaritons in 4H-SiC nanostructures as a proof-of-concept. With this
technique, we demonstrate an enhanced spatial resolution of ∼λIR/9, enabling to resolve the polariton resonances in
individual sub-diffractional nanostructures with sub-wavelength spacing.
Furthermore we show, that this resolution allows to differentiate between
spatial patterns associated with different polariton modes within individual
nanostructures.
