Scanning near-field optical microscope working with a CdSe/ZnS quantum dot based optical detector

  • Aigouy L
  • Samson B
  • Julié G
 et al. 
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We have developed a scanning near-field optical microscope that uses a subwavelength-sized silica sphere covered with CdSe/ZnS quantum dots as a fluorescent optical detector. Due to the good photostability of these semiconducting particles, we are routinely able to perform several successive scans without a noticeable decrease of fluorescence signals. As an example, we will show some images of the light immediately transmitted through 300 nm wide slits made in a thin gold film. We will also discuss the advantages of such fluorescent probes compared to other near-field optical techniques. ? 2006 American Institute of Physics.

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