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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 375-378 |
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Moeini M, Talebi R. Inducing dichroism and birefringence in Ag-AgCl thin films by irradiating Nd: YAG laser with elliptical and circular polarization. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :375-378
URL: http://opsi.ir/article-1-2382-en.html
URL: http://opsi.ir/article-1-2382-en.html
1- Department of Physics, University of Isfahan, Isfahan
2- Department of Physics, University of Isfahan, Isfahan, Quantum optics group, Department of Physics, University of Isfahan, Isfahan
2- Department of Physics, University of Isfahan, Isfahan, Quantum optics group, Department of Physics, University of Isfahan, Isfahan
Abstract: (1083 Views)
By irradiating light to the surface of the Ag-AgCl thin film, ordered periodic nanostructures are formed. Ag-AgCl thin film is a light-sensitive medium that optical activity and anisotropy can be induced by irradiating low power laser beam. In this report, in order to induce optical activity and anisotropy in Ag-AgCl thin films, this layer is exposed to normal incidence of Nd: YAG laser beam with elliptically and circularly polarized light. Furthermore, optical properties of nanostructures, such as birefringence and dichroism, have been experimentally investigated. Circular birefringence and circular dichroism of nanostructures are due to optical activity and linear birefringence and linear dichroism are due to the anisotropy of the nanostructures. Experimental results show that by increasing polarization angle of the elliptically polarized light (the more it becomes elliptical), the contribution of linear dichroism decreases. It shows that increasing the angular polarization of the incident beam reduces the anisotropy of the periodic nanostructures.
Keywords: Surface Plasmon resonance, Elliptical polarization, Nd: YAG laser, Ag-AgCl thin films, Optical rotation
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