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Results of modelling and experimental investigation of electrodynamic characteristics of dielectric waveguide illuminators as radiating elements for millimeter-wave near-field microscopes are presented. Examples of characteristics of illumination at interaction of radiation with low-loss dielectrics and semiconductors.
High-resolution computer-controlled oscillator of 2-mm wave-range intended for the low temperature dielectrometer was designed and constructed. The proposed oscillator unit may be used as free-running source as well as phase locked source being included to the frequency synthesis system. Dependence of dielectric loss vs temperature for some diamond-like materials was measured using proposed oscillator...
The description of the precision temperature measurement unit for measuring temperature of the investigated samples in the low-temperature dielectrometer in the range of 0.3 − 300 K with an accuracy of 0.05 K is given. Four-wire measurement circuit on an alternating current with use of the semiconductor temperature sensor (semiconductor film resistance thermometer) in the whole temperature range is...
The paper presents the results of experimental investigation of the temperature dependence of dielectric losses of a number of high-resistance semiconductor materials at frequencies 110 – 144 GHz and 280 GHz in the temperature range 1 – 300 K by using the technique of the disk dielectric resonator with whispering gallery modes. Dielectric loss tangent of some materials is less than 10−5. Dielectric...
The paper presents the study results of the temperature dependence of the dielectric loss at millimeter waves in the temperature range of 1.0 ??? 300 K in some low-absorbing dielectric and semiconductor materials having the diamond-like crystal lattices. It is shown that the absorption maxima at helium temperatures in materials with a centrosymmetric lattice are primary associated with both intrinsic...
To meet requirements, which arise while design of equipment for research the dielectric parameters of low-loss materials in the millimeter waveband, the necessity of high-precision temperature stabilization and measurement appear. Despite the fact that a lot of attention [1,2] is devoted to this task already, it reminds still actual, due to a plenty of specific features, which each given measuring...
Study of liquids in a wide range of frequencies is the actual task for determination the change of their parameters. For this purpose, a number waveguide and resonant methods have been proposed [1]. In particular, solid-state dielectric resonators with partial filling them by liquid are used [2]. In this report the results of research the peculiarities of whispering gallery modes (WGM) in an axially...
Spectral and field characteristics of the open disk liquid resonator in the four-millimeter waveband are experimentally investigated. The resonator is made as the thin-walled cuvette filled by a liquid in which whispering gallery modes are excited. The construction of the resonator is convenient for studying of characteristics of disk resonators in view of possibility of change of its parameters and...
Investigation of some dielectric and semiconductor materials in the millimeter waveband and temperature range from helium to room temperature is carried out. The technique using the open disk resonator with whispering gallery modes was used. The character of the behavior of permittivity and loss tangent of materials is determined. Comparative analysis of the results is performed.
Description of the designed experimental stand for investigation of properties of metamaterials including left-handed media in open space and results of model experiments in the millimeter waveband is given.
The results of experimental study of spectral, power and field characteristics of spiral resonators with whispering gallery-like modes (WGM) in the millimeter wave band by means of the computerized measuring stand are presented. Design of tunable filters and systems with directional radiation on the base of such resonators is discussed.
Existing methods and facilities for quality testing of electronic industry products do not allow to realize the full-scale testing of such objects as integrated circuits and multilayer thin-film nanostructures etc. under conditions of their poor optical transparence. Near field-microscopy in microwave and millimeter wave bands allows overcoming this limitation owing to the opportunity to use the frequencies,...
Low temperature experiments on the interaction of electromagnetic field with liquid helium have produced a number of interesting and unexpected results that have yet to be explained in a conventional manner. One of such effects is the resonance absorption and radiation of electromagnetic waves in superfluid helium at a frequency f corresponding to the roton gap of the energy spectrum, ε = Δ/ħ. For...
Detection properties of planar microwave diodes have been investigated under the action of external magnetic field at room temperature. The diodes were fabricated from modulation doped semiconductor structures having planar asymmetrically and symmetrically narrowed n-n+ junctions. Their operation is based on non-homogeneous carrier heating by a microwave electric field. Frequency dependence of the...
The results of experimental study of spectral, power and field characteristics of single, half-disk, spiral resonators as well as coupled disk dielectric resonators (DDR) with whispering gallery modes (WGM) in the millimeter waveband by means of the computerized measuring stand are presented. Possibility of design of controlled EHF elements and modeling of microresonator structures on the basis of...
The results of experimental study of spectral, power and field characteristics of single, half-disk, spiral resonators and also coupled disk dielectric resonators (DDR) with whispering gallery modes (WGM) in millimeter wave band by means of the computerized measuring stand are presented. The possibility of design of controlled EHF elements on the basis of coupled DDRs for the probable application...
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