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  Pseudoheterodyne near-field imaging at kHz repetition rates via quadrature-assisted discrete demodulation

Palato, S., Schwendke, P., Große, N., & Stähler, J. (2022). Pseudoheterodyne near-field imaging at kHz repetition rates via quadrature-assisted discrete demodulation. Applied Physics Letters, 120(13): 131601. doi:10.1063/5.0087187.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000A-3926-C Version Permalink: https://hdl.handle.net/21.11116/0000-000B-3FCC-A
Genre: Journal Article

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 Creators:
Palato, Samuel1, 2, Author           
Schwendke, Philipp1, 2, Author           
Große, Nicolai3, Author           
Stähler, Julia1, 2, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Institut für Chemie, Humboldt-Universität zu Berlin, Berlin, Germany, ou_persistent22              
3Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              

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 Abstract: Scattering-type scanning near-field optical microscopy enables the measurement of optical constants of a surface beyond the diffraction limit.
Its compatibility with pulsed sources is hampered by the requirement of a high-repetition rate imposed by lock-in detection. We describe a
sampling method, called quadrature-assisted discrete (quad) demodulation, which circumvents this constraint. Quad demodulation operates
by measuring the optical signal and the modulation phases for each individual light pulse. This method retrieves the near-field signal in the
pseudoheterodyne mode, as proven by retraction curves and near-field images. Measurement of the near-field using a pulsed femtosecond
amplifier and quad demodulation is in agreement with results obtained using a CW laser and the standard lock-in detection method.

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Language(s): eng - English
 Dates: 2022-02-022022-03-192022-03-312022-03
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/5.0087187
 Degree: -

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Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: 13 Volume / Issue: 120 (13) Sequence Number: 131601 Start / End Page: - Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223