Distinguishing local photoinduced forces from global photoacoustic interactions in homodyne infrared photoinduced force microscopy.
| Title: | Distinguishing local photoinduced forces from global photoacoustic interactions in homodyne infrared photoinduced force microscopy. |
|---|---|
| Authors: | Almajhadi, Mohammad A.1 (AUTHOR) m.almajhadi@uoh.edu.sa |
| Source: | Journal of Applied Physics. 12/28/2024, Vol. 136 Issue 24, p1-6. 6p. |
| Subject Terms: | *MICROSCOPY, *DIFFRACTION patterns, *PHOTOTHERMAL effect, *SPATIAL resolution, *ATOMIC excitation |
| Abstract: | The rise of tip-based optical force microscopy has transformed nanoscale optical and chemical imaging, enabling sub-10 nm spatial resolution by integrating optical excitation with atomic force microscopy. Photoinduced force microscopy (PiFM) stands out as a key technique, with applications in single-molecule imaging, Raman spectroscopy, and near-field electromagnetic characterization. However, the contrast mechanisms underlying homodyne PiFM, particularly in the infrared regime, remain underexplored. This study provides novel insights into the interpretation of PiF signals, focusing on homodyne IR-PiFM. Contrary to previous assumptions, we demonstrate that the linear dependence of the PiF signal on sample thickness in homodyne mode originates from global photoacoustic forces rather than localized photothermal effects. By minimizing global interactions through power reduction and tip–sample proximity, we achieve a spatial resolution of 11 nm, comparable to heterodyne PiFM. Our findings reveal that both homodyne and heterodyne modes are fundamentally sensitive to tip-enhanced near-field optical intensity, with similar dependencies on sample thickness. This work advances the understanding of the contrast mechanism of PiFM and demonstrates that both homodyne and heterodyne modes can achieve high-resolution imaging, paving the way for broader applications in nanoscale optical and chemical analysis. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Distinguishing local photoinduced forces from global photoacoustic interactions in homodyne infrared photoinduced force microscopy. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Almajhadi%2C+Mohammad+A%2E%22">Almajhadi, Mohammad A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> m.almajhadi@uoh.edu.sa</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Applied+Physics%22">Journal of Applied Physics</searchLink>. 12/28/2024, Vol. 136 Issue 24, p1-6. 6p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22MICROSCOPY%22">MICROSCOPY</searchLink><br />*<searchLink fieldCode="DE" term="%22DIFFRACTION+patterns%22">DIFFRACTION patterns</searchLink><br />*<searchLink fieldCode="DE" term="%22PHOTOTHERMAL+effect%22">PHOTOTHERMAL effect</searchLink><br />*<searchLink fieldCode="DE" term="%22SPATIAL+resolution%22">SPATIAL resolution</searchLink><br />*<searchLink fieldCode="DE" term="%22ATOMIC+excitation%22">ATOMIC excitation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The rise of tip-based optical force microscopy has transformed nanoscale optical and chemical imaging, enabling sub-10 nm spatial resolution by integrating optical excitation with atomic force microscopy. Photoinduced force microscopy (PiFM) stands out as a key technique, with applications in single-molecule imaging, Raman spectroscopy, and near-field electromagnetic characterization. However, the contrast mechanisms underlying homodyne PiFM, particularly in the infrared regime, remain underexplored. This study provides novel insights into the interpretation of PiF signals, focusing on homodyne IR-PiFM. Contrary to previous assumptions, we demonstrate that the linear dependence of the PiF signal on sample thickness in homodyne mode originates from global photoacoustic forces rather than localized photothermal effects. By minimizing global interactions through power reduction and tip–sample proximity, we achieve a spatial resolution of 11 nm, comparable to heterodyne PiFM. Our findings reveal that both homodyne and heterodyne modes are fundamentally sensitive to tip-enhanced near-field optical intensity, with similar dependencies on sample thickness. This work advances the understanding of the contrast mechanism of PiFM and demonstrates that both homodyne and heterodyne modes can achieve high-resolution imaging, paving the way for broader applications in nanoscale optical and chemical analysis. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1063/5.0239117 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 1 Subjects: – SubjectFull: MICROSCOPY Type: general – SubjectFull: DIFFRACTION patterns Type: general – SubjectFull: PHOTOTHERMAL effect Type: general – SubjectFull: SPATIAL resolution Type: general – SubjectFull: ATOMIC excitation Type: general Titles: – TitleFull: Distinguishing local photoinduced forces from global photoacoustic interactions in homodyne infrared photoinduced force microscopy. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Almajhadi, Mohammad A. IsPartOfRelationships: – BibEntity: Dates: – D: 28 M: 12 Text: 12/28/2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 00218979 Numbering: – Type: volume Value: 136 – Type: issue Value: 24 Titles: – TitleFull: Journal of Applied Physics Type: main |
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