Measurement of the complex dielectric constant of a single gold nanoparticle |
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Authors: | Stoller Patrick Jacobsen Volker Sandoghdar Vahid |
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Institution: | Laboratory of Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland. |
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Abstract: | 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 nm. 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. |
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