Journal
OPTICS LETTERS
Volume 31, Issue 16, Pages 2474-2476Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.31.002474
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A differential interference contrast microscopy technique that employs a photonic crystal fiber as a white-light source is used to measure both the real and the imaginary part of the complex dielectric constant of single 10 and 15 nm gold nanoparticles over a wavelength range of 480 to 610 run. Noticeable deviations from bulk gold measurements are observed at short wavelengths and for individual particles even after taking into account finite-size surface damping effects. (c) 2006 Optical Society of America.
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