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Proceedings Paper

Plasma dispersion effect assisted nanoscopy based on tuning of absorption and scattering resonances of nanoparticles
Author(s): Yossef Danan; Tali Ilovitsh; Danping Liu; Hadar Pinhas; Moshe Sinvani; Yehonatan Ramon; Jonathan Azougi; Alexandre Douplik; Zeev Zalevsky
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Paper Abstract

In this paper we present gold nanoparticles coated with silicon that switch the order between the scattering and the absorption magnitude at the resonance peak and tune the plasmon resonance over the spectrum. This is obtained by modifying the refractive index of the silicon coating of the nanoparticle by illuminating it with a pumping light due to the plasma dispersion effect in silicon. We also report how changing the diffraction limited point spread function through the utilization of plasma dispersion effect of the above mentioned silicon coated nanoparticles allows doing imaging with sub wavelength resolution. The plasma dispersion effect can increase the absorption coefficient of the silicon, when illuminated with a focused laser beam and as explained above it can also tune the absorption versus scattering properties of the nanoparticle. Due to the Gaussian nature of the laser illumination which has higher intensity at its peak, the plasma dispersion effect is more significant at the center of the illumination. As a consequence, the reflected light from probe beam at the near infra-red region has a sub wavelength dip that overlaps with the location of the pump illumination peak. This dip has a higher spatial frequency than an ordinary Gaussian, which enables to achieve super resolution.

Paper Details

Date Published: 22 April 2016
PDF: 10 pages
Proc. SPIE 9721, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII, 97210J (22 April 2016); doi: 10.1117/12.2210800
Show Author Affiliations
Yossef Danan, Bar-Ilan Univ. (Israel)
Tali Ilovitsh, Bar-Ilan Univ. (Israel)
Danping Liu, Chongqing Univ. (China)
Hadar Pinhas, Bar-Ilan Univ. (Israel)
Moshe Sinvani, Bar-Ilan Univ. (Israel)
Yehonatan Ramon, Bar-Ilan Univ. (Israel)
Jonathan Azougi, Bar-Ilan Univ. (Israel)
Alexandre Douplik, Ryerson Univ. (Canada)
Zeev Zalevsky, Bar-Ilan Univ. (Israel)

Published in SPIE Proceedings Vol. 9721:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII
Alexander N. Cartwright; Dan V. Nicolau; Dror Fixler, Editor(s)

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