Measurement of the complex dielectric constant of a single gold nanoparticle

Stoller, Patrick; Jacobsen, Volker; Sandoghdar, Vahid

doi:10.1364/OL.31.002474

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Measurement of the complex dielectric constant of a single gold nanoparticle

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Stoller, P., Jacobsen, V., & Sandoghdar, V. (2006). Measurement of the complex dielectric constant of a single gold nanoparticle. Optics Letters, 31, 2474-2476. doi:10.1364/OL.31.002474.

Cite as: https://hdl.handle.net/21.11116/0000-0002-9B56-F

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 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.