Reflection Shifts in Gold Nanoparticles
الموضوعات : فصلنامه نانوساختارهای اپتوالکترونیکی
1 - School of Engineering Science, College of Engineering, University of
Tehran, Enqelab Street, Tehran, Iran
الکلمات المفتاحية: temperature, Gold Nanoparticles, Photonics, Goos-Hanchen Shift, Imbert-Fedorov Shift, Particle Size,
ملخص المقالة :
Metal nanoparticles are widely researched for the fabrication of novel low
cost and more energy efficient optoelectronic devices. Optical properties of metal
nanoparticles are known to be different from their bulk counterparts. In this paper, with
an appropriate modification of Drude model, I provide an improved dielectric function
for gold nanoparticles which accounts for particle size as well as temperature effects. The
model is consequently used to investigate Goos-Hanchen and Imbert-Fedorov reflection
shifts of an oblique linearly polarized laser beam reflected from the nanoparticles in
various temperatures. It is shown that the beam light can contribute both spatial and
angular shifts depending on its state of polarity. The maximum shifts take place at grazing
angles when the polarization of light is set at TM and 45°. Study of the light deviations'
sensitivity to the temperature indicates that reflection shifts decrease linearly at higher
temperatures except in angular out-of-plane shift Θ𝐼𝐹 . The trend is incremental for
different nanoparticle size, keeping the distinct behavior of Θ𝐼𝐹 . Such results allow more
accurate prediction of many optical phenomena involving nanoscaled gold and may serve
as a delicate method to determine nanoparticles' size.
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