انتشار مدهاي TE0و TE1 در لايه ي نقره-كلريدنقره و ثبت قطبش هاي مختلف خطي، بيضوي و دايره اي باريكه ي ليزر تكفام در اين لايه

Propagating TE0 an‎d TE1 modes in Ag-AgCl film an‎d recording linear, elliptical, an‎d circular polarization of a monochrome laser beam in this film

فيزيك

In this dissertation, the formation of arranged silver nanostructures in a 235 nm-thick silver chloride (AgCl) waveguide layer under irradiation by the second harmonic wave of a Nd:YAG laser beam was investigated. The laser beams with linear polarization, right-han‎ded an‎d left-han‎ded elliptical polarization at 15° an‎d 30°, an‎d right-han‎ded an‎d left-han‎ded circular polarization were employed. To fabricate the Ag–AgCl layer, the AgCl film was first deposited on a flat glass substrate with a cutoff thickness of 235 nm for simultaneous propagation of TE0 an‎d TE1 modes, followed by the deposition of a 10 nm thick silver layer. During the laser exposure of the Ag-AgCl film, the formation of silver complex nanostructures was investigated by the observation of diffraction an‎d small-angle scattering patterns. The optical properties of the fabricated samples, including linear dichroism an‎d optical rotation, were measured. It was demonstrated that the induced anisotropy in the samples leads to optical rotation. Spectral measurements of absorption an‎d linear dichroism revealed that the samples irradiated with linear polarization an‎d left-han‎ded 15° elliptically polarized beams exhibit the highest linear dichroism, while no linear dichroism was observed in the samples irradiated with circularly polarized beams. The largest optical rotation occurs in the samples irradiated with a linearly polarized beam an‎d a 15° elliptically polarized beam. The optical rotation observed in the samples originates from anisotropy an‎d chirality. In the case of linearly polarized irradiation, the optical rotation originates from the induced optical anisotropy of the medium, whereas in the samples exposed to a 15° elliptically polarized beam, optical rotation arises from both anisotropy an‎d chirality.

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