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RESONATOR METHOD FOR DETERMINATION OF LOSSES IN ONE-DIMENSIONAL METAL GRATINGS IN TERAHERTZ RANGE

heading: 
MICROWAVE AND TERAHERTZ TECHNOLOGY
Dzyubenko, MI, Kamenev, YE, Radionov, VP, Litvina, ZY
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

Kharkiv national university of Air Force
61023, Kharkiv-23, 77/79 Sumska str.
https://doi.org/10.15407/rej2018.02.069
Language: russian
Abstract: 

Subject and purpose. The terahertz frequency range currently attracts much attention due to the wide possibilities of its application for solving a number of problems in science, technology, and medicine. In this range, metal gratings with the period shorter than the wavelength are widely used as partially transparent mirrors of lasers and in various quasi-optical devices. The determination of the parameters of such gratings is an actual problem.

Methods and methodology. The method of experimental comparison of the parameters (losses and transmittance) 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. The adjustment of feedback is performed by rotation of the dihedral mirror around the resonator axis. The angle of rotation of the dihedral mirror, which provides the maximum power of laser radiation, characterizes the transmittance coefficient of the investigated grating. The value of the maximum power of laser radiation characterizes the magnitude of the losses in the investigated grating. This allows one to compare the grating parameters experimentally without the use of metrological instruments.

Results. An experimental comparison of the parameters of metal gratings with different structures was carried out as an approbation of the method. Recommendations for the increase of the measurement reliability and further advancement of this method were developed.

Conclusions. The proposed method is an effective tool for comparing the transmittance and loss factors in one-dimensional metal gratings for their control and culling. In addition, this method can serve as a measuring device, when reference gratings with known parameters are used for comparison.
Keywords: laser, losses, metal grating, resonator, terahertz range

Manuscript submitted 31.01.2018
PACS 42.60.By​
Radiofiz. elektron. 2018, 23(2): 69-75
Full text  (PDF)

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