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5 October 2023 On-demand mid-IR to visible upconversion with a near-field microscope
Philippe Roelli, Isabel Pascual, Iris Niehues, Javier Aizpurua, Rainer Hillenbrand
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Proceedings Volume PC12654, Enhanced Spectroscopies and Nanoimaging 2023; PC126540Z (2023) https://doi.org/10.1117/12.2676823
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
S-SNOM has transformed into a key actor for nanoscale imaging and spectroscopy. Extension of its abilities beyond the mere infrared absorption would be interesting for numerous technological developments. Here, we use s-SNOM to study mid-IR to VIS sum-frequency generation (SFG), in which the sample’s SFG cross-section is enhanced by orders of magnitude by the microscope’s tip. Combining mid-IR and VIS illuminations on gold nanostructures and studying several molecular vibrations, we clarify the contribution of the tip onto this nonlinear optics process. Our work could also lead to a novel near-field microscopy modality where non-linear optical properties could be probed at the nanoscale.
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Philippe Roelli, Isabel Pascual, Iris Niehues, Javier Aizpurua, and Rainer Hillenbrand "On-demand mid-IR to visible upconversion with a near-field microscope", Proc. SPIE PC12654, Enhanced Spectroscopies and Nanoimaging 2023, PC126540Z (5 October 2023); https://doi.org/10.1117/12.2676823
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KEYWORDS
Mid-IR
Near field scanning optical microscopy
Microscopes
Upconversion
Sum frequency generation
Imaging spectroscopy
Vibration
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