Research Papers

Silicon-coated gold nanoparticles nanoscopy

[+] Author Affiliations
Yossef Danan, Tali Ilovitsh, Yehonatan Ramon, Zeev Zalevsky

Bar-Ilan University, Faculty of Engineering, Max and Anna Web Street, Ramat-Gan 5290002, Israel

Bar-Ilan University, The Bar-Ilan Institute of Nanotechnology and Advanced Materials, Max and Anna Web Street, Ramat-Gan 5290002, Israel

Dror Malka

Bar-Ilan University, Faculty of Engineering, Max and Anna Web Street, Ramat-Gan 5290002, Israel

Holon Institute of Technology, Faculty of Engineering, 52 Golomb Street, Holon 5810201, Israel

Danping Liu

Chongqing University, College of Communications Engineering, 131 Yubei Road, Shapingba, Chongqing 400030, China

J. Nanophoton. 10(3), 036015 (Sep 08, 2016). doi:10.1117/1.JNP.10.036015
History: Received June 9, 2016; Accepted August 17, 2016
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Abstract.  This paper presents a method for modifying the point spread function (PSF) into a doughnut-like shape, through the utilization of the plasma dispersion effect (PDE) of silicon-coated gold nanoparticles. This modified PSF has spatial components smaller than the diffraction limit, and by scanning the sample with it, super-resolution can be achieved. The sample is illuminated using two laser beams. The first is the pump, with a wavelength in the visible region that creates a change in the refractive index of the silicon coating due to the PDE. This creates a change in the localized surface plasmon resonance wavelength. Since the pump beam has a Gaussian profile, the high intensity areas of the beam experience the highest refractive index change. When the second beam (i.e., the probe) illuminates the sample with a near-infrared wavelength, this change in the refractive index is transformed into a change in the PSF profile. The ordinary Gaussian shape is transformed into a doughnut shape, with higher spatial frequencies, which enables one to achieve super-resolution by scanning the specimen using this PSF. This is a step toward the creation of a nonfluorescent nanoscope.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Yossef Danan ; Tali Ilovitsh ; Yehonatan Ramon ; Dror Malka ; Danping Liu, et al.
"Silicon-coated gold nanoparticles nanoscopy", J. Nanophoton. 10(3), 036015 (Sep 08, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.036015


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