Dielectric losses in CVD diamonds in the millimeter-wave range at temperatures 300?900 K

Паршин, В.В.; Garin, B.M.; Myasnikova, S.E.; Orlenekov, A. V.

doi:10.1007/s11141-005-0039-0

Cited by 17 publications

(7 citation statements)

References 12 publications

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“…Our previous study [12][13][14] have confirmed that the diamond sample with a more perfect inner structure, having the minimum number of relatively large-size microcaverns, has absorption closer to the theoretical curve up to 350 GHz. However, the studies of this sample in the 350-520 GHz range [6] clearly revealed the influence of the absorption scattering mechanism (Fig.…”

Section: Resultssupporting

confidence: 58%

“…The resonator spectrometer earlier developed at the IAP RAS, methods of measurement, and the results of studying various materials from 40 GHz up to 370 GHz are well described in [2][3][4][5][6]12]. So in present paper, a detailed description of the resonator excitation system and the frequency phase lock system, which were essentially modified for operation at the 350-520 GHz, is presented.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modern resonator spectroscopy at SubMM wavelengths

Паршин¹,

Tretyakov²,

Koshelev³

et al. 2013

2013 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves

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IntroductionThe resonance methods of investigations are widely used in precision spectroscopy in all frequency ranges due to their high sensitivity. But the resonance systems have different specific features in each range. In the millimeter (MM) and submillimeter (SubMM) ranges, classical open Fabry-Perot resonators with an emptyresonator Q-factor of about 10 6 (for reasonable sizes) are used for the gaseous and condensed media investigations [1][2][3][4][5][6][7][8].The present work based on the previous development is to our knowledge the first advancement of highsensitivity classical resonator spectroscopy to frequencies of up to 520 GHz. The resonator spectrometer earlier developed at the IAP RAS, methods of measurement, and the results of studying various materials from 40 GHz up to 370 GHz are well described in [2][3][4][5][6]12]. So in present paper, a detailed description of the resonator excitation system and the frequency phase lock system, which were essentially modified for operation at the 350-520 GHz, is presented.Also the first results obtained using the spectrometer in the extended frequency range are reported. Resonator spectrometer excitation system and frequency stabilization systemBackward wave oscillators (BWOs) are used as the sources of radiation with continuous frequency tuning. The sources are equipped with a precise digital frequency stabilization and control system based on the phase lock-in loop (PLL) system with the centimeters synthesizer harmonics used as the reference signal. It is worth mentioning that for broadband high-sensitivity MM and SubMM spectroscopy, BWOs remain the most convenient and reliable sources of radiation. A quasi-optical line forming the Gaussian beam is used for the resonator excitation. Fundamental TEM00q modes of the Fabry-Perot resonator are employed. A small-angle round smooth horn is used for transformation of the main generator waveguide mode TE01 to a quasi-optical Gaussian beam. Our quasi-optical line makes it possible to excite the parasitic TEMmnq modes at a level less than 10% of the TEM00q modes at all operation frequencies.The main characteristic of the frequency ranges above 370 GHz are, first of all, the decreasing (down to several milliwatts) BWO output power and the point-contact detectors sensitivity reducing. For the frequency range 350-520 GHz covered by an OB-32 BWO, a quasi-optical line Fig. 1. was developed. There are: (1) BWO in the magnet. (2) Waveguide junction from output waveguide with 1.2 ×2.4 mm 2 cross section to the waveguide with 0.55 × 1.1 mm 2 cross section. (3) Horn. (4) Beam splitter for the PLL system. (5) Attenuator. (6) 3-dB divider. (7) Terminating loads. (8) Transmission line of resonator response to bolometer. (9) Horn. (10) Multiplier-mixer of the PLL system. (11) Multiplier-amplifier of the cantimetre synthesizer signal in the PLL system. (12) Isolator 8-18 GHz. (13) Preamplifier (HEMT) of intermediate frequency (IF) in the PPL system.We would like to note that components 4-8 have been assembled from the excellent S...

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Section: Resultssupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Modern resonator spectroscopy at SubMM wavelengths

Паршин¹,

Tretyakov²,

Koshelev³

et al. 2013

2013 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves

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show abstract

“…In other words, it is not necessary to measure the idle-resonator Qfactor, i.e., it is not necessary to extract the studied sample from the resonator. It is fairly convenient to study temperature dependences of tan δ by placing the studied sample in heating or cooling fitting inside the resonator [6].…”

Section: Measuring the Dielectric Parametersmentioning

confidence: 99%

Instrumental complex and the results of precise measurements of millimeter- and submillimeter-wave propagation in condensed media and the atmosphere

Паршин

Tretyakov

Koshelev

et al. 2009

Radiophys Quantum El

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We describe an instrumental complex based on high-Q open Fabry-Perot resonators for the frequency band 36-370 GHz and present original measurement techniques and the latest results of measuring (i) refractive indices and losses of modern high-quality dielectrics for high-power electronics (with prognosis for up to the terahertz band) and general-purpose dielectrics including films, (ii) reflectivities of both antenna reflectors of cryogenic-receiver radiotelescopes and the so-called "hot" antennas for future Mercurian missions, and (iii) the atmospheric absorption for the development of high-precision wave-propagation models including the continuum absorption. The instrumentation and the measurement techniques are intended for studying condensed-media parameters at temperatures 80-900 K and atmospheric parameters at temperatures from −40 • C to +60 • C and humidities from 0 to 80%.

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“…This paper aims at determining the absorption properties of such materials in the millimeterwave range at temperatures up to the temperature of composition sintering, which exceeds 1000 • C. At such high temperatures, it is rather difficult to use the conventional waveguide methods of measuring dielectric properties of the materials. The use of the methods based on application of millimeter-wave beams also meets great technical difficulties caused by the necessity of using high-temperature heating devices [4][5][6]. In addition, the absorption of millimeter waves in metal-ceramic composite materials is, as a rule, great.…”

Section: Introductionmentioning

confidence: 99%

Absorption of microwaves in metal-ceramic powder materials

Eremeev

Plotnikov

Rybakov

et al. 2010

Radiophys Quantum El

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Sintering of metal-ceramic composites by microwave heating is a promising method for creation of functionally graded materials. In this paper, we study the absorption of microwaves in compacted mixtures of metal and dielectric powders. The coefficient of microwave absorption is calculated within the framework of the effective-medium approximation as a function of the mass fraction, dimensions, and temperature of metal particles. The experimental method for determination of the microwave absorption coefficient is proposed, which is based on measuring the temperature of the samples during their heating by microwaves in an oversized working chamber. The coefficients of microwave absorption in powder composites Al 2 O 3 -Ni, which were measured by the proposed method, are presented. An agreement between the theoretical and experimental results is demonstrated.

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Dielectric losses in CVD diamonds in the millimeter-wave range at temperatures 300?900 K

Cited by 17 publications

References 12 publications

Modern resonator spectroscopy at SubMM wavelengths

Modern resonator spectroscopy at SubMM wavelengths

Instrumental complex and the results of precise measurements of millimeter- and submillimeter-wave propagation in condensed media and the atmosphere

Absorption of microwaves in metal-ceramic powder materials

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