Abstract
We demonstrate a high-spatial-resolution imaging and spectroscopy tool using
a solid immersion lens (SIL), a hemispherical lens made of high refractive index
glass (n ~2). Photoluminescence (PL) images of single CdSe nanocrystals confirm a
numerical aperture enhancement factor of ~2, close to the refractive index of the
SIL. In particular, a bare-eye observation of PL signals emitted by single
nanocrystals with ~10 µm<sup>-2</sup> densities was possible over an
~30 µm diameter region. In addition, the PL spectra of single CdSe
nanocrystals were successfully measured at room temperature. Thus, this SIL
microscope ensures a simple but powerful method for nanostructure spectroscopy.
© 2011 Optical Society of Korea
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