1973
DOI: 10.1063/1.1662498
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Radiation temperature and radiation power of thermal phonon radiators using diamond as transmission medium

Abstract: Thermal phonon radiators allow short pulses of incoherent thermal phonon beams to generate in a simple manner and the center frequency of the broad frequency distribution of the emitted phonons to vary up to the acoustic cutoff frequencies. This paper reports experimental investigations of the connection between radiation temperature and radiation power using films of several metals (copper, nickel, gold, and lead) as phonon radiators on diamond. The measured dependencies of the radiation temperature on the ra… Show more

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Cited by 56 publications
(10 citation statements)
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“…The observation of phonon resonances in thin A1-junction films [37] gives evidence for the presence of a damping mechanism in the boundary. Without damping the perpendicular transmission (10) [38,39,7]. The physical reason for the comparatively small influence of phonon boundary splitting on the total phonon transmission is due to the fact that phonon splitting is a dissipative process and enters the characteristic acoustic boundary impedance as imaginary term.…”
Section: Results For the Phonon Yieldmentioning
confidence: 99%
“…The observation of phonon resonances in thin A1-junction films [37] gives evidence for the presence of a damping mechanism in the boundary. Without damping the perpendicular transmission (10) [38,39,7]. The physical reason for the comparatively small influence of phonon boundary splitting on the total phonon transmission is due to the fact that phonon splitting is a dissipative process and enters the characteristic acoustic boundary impedance as imaginary term.…”
Section: Results For the Phonon Yieldmentioning
confidence: 99%
“…It was heated by electric current pulses with a duration ∆t = 0.2 µs at a repetition rate of 3 kHz. The pulse power density P was of 5-16 kW/cm 2 that corresponds to the heater temperature T h of 17-25 K calculated from the acoustic mismatch theory [16]. The generated nonequilibrium phonons propagate through the GaAs substrate, reach the DMS nanostructure and heat the spin system of the magnetic ions.…”
Section: Samples and Experimental Proceduresmentioning
confidence: 99%
“…We assume these transitions account for the further 40 mV. It is important to note that the second offset, V (2) 0 , is therefore a measure of the superlattice's resolution (0.8 meV = 40 mV × e/n) in detecting acoustic phonons.…”
Section: Resultsmentioning
confidence: 99%
“…Nonequilibrium phonons are generated by applying electrical pulses of 50-100 ns duration to the heater. The temperature of the heater, T h , is calculated using mismatch theory [2] from which P = 524(T 4 h − T 4 l )W m −2 , where P is the power per unit area applied to the film and T l is the lattice temperature. By applying electrical pulses of between 0.5 and 5 V across the film, the characteristic temperature of the phonon energy distribution could be varied between 7 and 13 K. The resulting change in the tunnel current due to the phonon pulse is measured using a high speed digitiser/signal averager as both a function of applied bias V and heater temperature.…”
Section: Methodsmentioning
confidence: 99%