Photo-induced dipole and thermal forces for spectroscopic nanoimaging

Junghoon Jahng

doi:10.1117/12.2675658

5 October 2023 Photo-induced dipole and thermal forces for spectroscopic nanoimaging

Junghoon Jahng

Proceedings Volume PC12654, Enhanced Spectroscopies and Nanoimaging 2023; PC126540X (2023) https://doi.org/10.1117/12.2675658
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Photo-induced force microscopy (PiFM) is a scan probe technique that offers images with spectroscopic contrast at a spatial resolution in the nanometer range. PiFM utilizes the non-propagating, enhanced near field at the apex of a sharp tip to locally induce a polarization in the sample, which in turn produces an additional force acting on the cantilevered tip. This photo-induced force, though in the pN range or less, can be extracted from the oscillation properties of the cantilever, thus enabling the generation of photo-induced force maps. Since its inception in 2010, the PiFM technique has grown into a useful nano-spectrocopic tool that has expanded its reach in terms of imaging capabilities and applications. Nonetheless, the precise physical mechanism underlying the generation of photo-induced force is still a matter of ongoing research and debate, and a definitive explanation has yet to be established. In this talk, we discuss the physical origin of the PiFM signal, highlighting the contributions from dipole–dipole forces as well as forces that derive from photo-thermal processes.

Conference Presentation

Citation Download Citation

Junghoon Jahng "Photo-induced dipole and thermal forces for spectroscopic nanoimaging", Proc. SPIE PC12654, Enhanced Spectroscopies and Nanoimaging 2023, PC126540X (5 October 2023); https://doi.org/10.1117/12.2675658

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