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Apertureless scanning near-field optical microscopy: a comparison between homodyne and heterodyne approaches

Lewis Gomez 1 Renaud Bachelot 2, 1 Alexandre Bouhelier 1 Gary Wiederrecht 1 Shih-Hui Chang 1 Stephen Gray 1 Feng Hua 3 Seokwoo Jeon 3 John Rogers 3 Miguel Castro 4 Sylvain Blaize 2 Ilan Stefanon 2 Gilles Lerondel 2 Pascal Royer 2
1 ANL - Argonne National Laboratory [Lemont]
2 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique
ICD - Institut Charles Delaunay
3 University of Illinois at Urbana-Champaign [Urbana]
4 UPR-M - University of Puerto Rico at Mayagüez
Abstract : In coherent homodyne apertureless scanning near-field optical microscopy (ASNOM) the background field cannot be fully suppressed because of the interference between the different collected fields, making the images difficult to interpret. We show that implementing the heterodyne version of ASNOM allows one to overcome this issue. We present a comparison between homodyne and heterodyne ASNOM through near-field analysis of gold nanowells, integrated waveguides, and a single evanescent wave generated by total internal reflection. The heterodyne approach allows for the control of the interferometric effect with the background light. In particular, the undesirable background is shown to be replaced by a controlled reference field. As a result, near-field information undetectable by a homodyne ASNOM is extracted by use of the heterodyne approach. Additionally, it is shown that field amplitude and field phase can be detected separately.
Keywords : Image formation theory Scanning microscopy Destructive interference Near field optics Optical fields Scanning electron microscopy Tapered fibers Total internal reflection
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https://hal-utt.archives-ouvertes.fr/hal-02295930
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Submitted on : Tuesday, September 24, 2019 - 3:49:07 PM
Last modification on : Wednesday, October 20, 2021 - 2:42:17 PM

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Lewis Gomez, Renaud Bachelot, Alexandre Bouhelier, Gary Wiederrecht, Shih-Hui Chang, et al.. Apertureless scanning near-field optical microscopy: a comparison between homodyne and heterodyne approaches. Journal of the Optical Society of America B, Optical Society of America, 2006, 23 (5), pp.823. ⟨10.1364/JOSAB.23.000823⟩. ⟨hal-02295930⟩

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