Persons

The one-dimensional waveguide photonic structure - the photonic crystal with the controlled frequency characteristics - has been implemented. The tuning of the center frequency of the low-loss transmission window of the photonic crystal was achieved by selecting the parameters of irregularity I in the photonic crystal, while the control of the transmission value at selected frequency was performed by changing voltage on Pin-diode. The possibility of implementing the microwave device in the X-band with the pass band of 70 MHz at the 3 dB-level and with the transmission coefficient adjustable in the band from 1.5 dB to 25 dB with changing the voltage on PIN-diode from 0 to 700 mV, based on the waveguide photonic crystal, has been shown.

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The computer simulation and experimental investigation of the frequency dependencies of the reflectance and transmittance of photon crystals based on the microstrip lines in the 0–20 GHz frequency band have been performed. The investigations were conducted for the photon crystal with the irregularity, introduced as the changed geometry size of the stripline conductor or changed substrate permittivity of one of the sequence microstrip sections. A good agreement between the calculations and the experimental results has been obtained. The possibility for application of open microwave transmission lines for realizing the parameters measurement method of the material, which acts as irregularity in photon crystal, has been demonstrated.

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The possibility of determination of thickness and electro-physical parameters of thin nanometer and sub-micrometer dielectric and metal films in the sandwich-like structures, using the results of measurements on the reflection and transmission spectra of optical and microwave radiation, has been shown. The measurement results for the refractive index of SnO films in the thickness range from 40 nm to 2,8 µm, and the conductivity of cuprum films applied to the glass substrates have been presented.

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