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Measurement of electrodynamic characteristics of flat metal gratings in the teraherz range

heading: 
MICROWAVE AND TERAHERTZ TECHNOLOGY
Dzyubenko, MI, Kamenev, YE, Masalov, SA, Radionov, VP
Organization: 

O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
12, Proskura st., Kharkov, 61085, Ukraine
E-mail: mid41@ukr.net
https://doi.org/10.15407/rej2019.02.078
Language: russian
Abstract: 

Subject and purpose. The terahertz frequency range now attracts much attention of researchers and consumers in connection with the wide possibilities of using it for solving a number of problems in science, technology and medicine. Metal gratings with the period shorter than the wavelength are widely used in this range as partially transparent mirrors of lasers and in various quasi-optical devices. Determining the parameters of such gratings is an actual problem.

Methods and methodology. The method of experimental determining of the parameters (transmittance and phase shift) of metal gratings consisting of parallel conductors is presented in the paper. A THz laser with a smooth adjustment of the output of laser radiation from the resonator was used as a measuring device. The investigated metal grating serves as the exit mirror of this laser. The dihedral 90° mirror is the second mirror of the laser resonator. Adjustment of feedback is performed by rotating the dihedral mirror around the resonator axis. Laser radiation acquires elliptical polarization as a result of this. The angle of rotation of the dihedral mirror, which ensures the equality of the powers of the E and H polarizations of the laser radiation, is an experimental value for calculating the transmission coefficient of the investigated grating. The polarization ellipse of radiation at this angle of rotation serves as the basis for calculating the phase shift introduced by the grating.

Results. An experimental determination of the parameters of metal gratings made on a transparent substrate, having different structures was carried out as an approbation of the method. Comparison of the experimental data with theoretical calculations was carried out. Recommendations for increasing the reliability of measurements and further development of this method were developed during the tests.

Сonclusions. The proposed method makes it possible to determine the parameters of one-dimensional metal gratings without using metrological instruments.
Keywords: laser, metal grating, phase shift, resonator, terahertz range, transmittance

Manuscript submitted 12.02.2019
PACS: 42.60.By
Radiofiz. elektron. 2019, 24(2): 78-85
Full text  (PDF)

References: 

 

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