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Thermoelectric nanospectroscopy for the imaging of molecular fingerprints

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Bibliographic Details
Title: Thermoelectric nanospectroscopy for the imaging of molecular fingerprints
Authors: Ulrich Georg, Pfitzner Emanuel, Hoehl Arne, Liao Jung-Wei, Zadvorna Olga, Schweicher Guillaume, Sirringhaus Henning, Heberle Joachim, Kästner Bernd, Wunderlich Jörg, Venkateshvaran Deepak
Source: Nanophotonics, Vol 9, Iss 14, Pp 4347-4354 (2020)
Publisher Information: De Gruyter, 2020.
Publication Year: 2020
Collection: LCC:Physics
Subject Terms: nanospectroscopy, photothermoelectric effect, s-snom, Physics, QC1-999
Description: We present a nanospectroscopic device platform allowing simple and spatially resolved thermoelectric detection of molecular fingerprints of soft materials. Our technique makes use of a locally generated thermal gradient converted into a thermoelectric photocurrent that is read out in the underlying device. The thermal gradient is generated by an illuminated atomic force microscope tip that localizes power absorption onto the sample surface. The detection principle is illustrated using a concept device that contains a nanostructured strip of polymethyl methacrylate (PMMA) defined by electron beam lithography. The platform’s capabilities are demonstrated through a comparison between the spectrum obtained by on-chip thermoelectric nanospectroscopy with a nano-FTIR spectrum recorded by scattering-type scanning near-field optical microscopy at the same position. The subwavelength spatial resolution is demonstrated by a spectral line scan across the edge of the PMMA layer.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2192-8606
2192-8614
Relation: https://doaj.org/toc/2192-8606; https://doaj.org/toc/2192-8614
DOI: 10.1515/nanoph-2020-0316
Access URL: https://doaj.org/article/4658de40c22e47ae8a050b5cdf47967b
Accession Number: edsdoj.4658de40c22e47ae8a050b5cdf47967b
Database: Directory of Open Access Journals
Description
Abstract:We present a nanospectroscopic device platform allowing simple and spatially resolved thermoelectric detection of molecular fingerprints of soft materials. Our technique makes use of a locally generated thermal gradient converted into a thermoelectric photocurrent that is read out in the underlying device. The thermal gradient is generated by an illuminated atomic force microscope tip that localizes power absorption onto the sample surface. The detection principle is illustrated using a concept device that contains a nanostructured strip of polymethyl methacrylate (PMMA) defined by electron beam lithography. The platform’s capabilities are demonstrated through a comparison between the spectrum obtained by on-chip thermoelectric nanospectroscopy with a nano-FTIR spectrum recorded by scattering-type scanning near-field optical microscopy at the same position. The subwavelength spatial resolution is demonstrated by a spectral line scan across the edge of the PMMA layer.
ISSN:21928606
21928614
DOI:10.1515/nanoph-2020-0316