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Nat Commun
2015[Jun]; 6
(?): 7249
PMID26105690
show ga
Imaging the optical properties of individual nanosystems beyond fluorescence can
provide a wealth of information. However, the minute signals for absorption and
dispersion are challenging to observe, and only specialized techniques requiring
sophisticated noise rejection are available. Here we use signal enhancement in a
high-finesse scanning optical microcavity to demonstrate ultra-sensitive imaging.
Harnessing multiple interactions of probe light with a sample within an optical
resonator, we achieve a 1,700-fold signal enhancement compared with
diffraction-limited microscopy. We demonstrate quantitative imaging of the
extinction cross-section of gold nanoparticles with a sensitivity less than
1?nm(2); we show a method to improve the spatial resolution potentially below the
diffraction limit by using higher order cavity modes, and we present measurements
of the birefringence and extinction contrast of gold nanorods. The demonstrated
simultaneous enhancement of absorptive and dispersive signals promises intriguing
potential for optical studies of nanomaterials, molecules and biological
nanosystems.
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