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

Lewis Gomez, Renaud Bachelot, Alexandre Bouhelier, Gary P. Wiederrecht, Shih Hui Chang, Stephen K. Gray, Feng Hua, Seokwoo Jeon, John A. Rogers, Miguel E. Castro, Sylvain Blaize, Ilan Stefanon, Gilles Lerondel, Pascal Royer

研究成果: Article同行評審

76 引文 斯高帕斯(Scopus)

摘要

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, nearfield 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.

原文English
頁(從 - 到)823-833
頁數11
期刊Journal of the Optical Society of America B: Optical Physics
23
發行號5
DOIs
出版狀態Published - 2006 五月

All Science Journal Classification (ASJC) codes

  • 統計與非線性物理學
  • 原子與分子物理與光學

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