IR photothermal and spectroscopic analysis of proton-irradiated 4H-SiC

Hadi, Muhammad Salihi Abdul; Younes, J.; Soueidan, Maher; Kazan, M.

doi:10.1016/j.infrared.2021.103891

Cited by 5 publications

(2 citation statements)

References 44 publications

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“…The observed decrease in mode frequency with increasing temperature, followed by an increase in mode frequency and the appearance of an additional minimum at a higher frequency when the temperature exceeds 730 K, can be understood if the following is realized. Pure phonon anharmonicity and phonon-plasmon coupling are opposite effects in the sense that phonon anharmonicity leads to a decrease in the frequency of the phonon mode with increasing temperature [39,40], while the coupling between phonon and plasma oscillation modes increases the energy of the resulting phonon-plasmon mode above that of the pure longitudinal phonon mode [41]. Thus, the linear temperature dependence of the frequency of the E 1 symmetry mode observed in the temperature range 280-665 K indicates a typical three-phonon anharmonic process of a pure phonon and shows no effect of thermally injected free carriers in this temperature range [42][43][44].…”

Section: Resultsmentioning

confidence: 99%

Transition from surface phonon-polariton to surface phonon–plasmon-polariton by thermal injection of free carriers

El-Helou¹,

Wu²,

Bruyant³

et al. 2022

J. Phys.: Condens. Matter

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Surface phonon-polariton, surface plasmon-polariton, and surface phonon-plasmon-polariton are evanescent electromagnetic waves confined to the surfaces of different classes of materials, which gives each of them particular characteristics suitable for diverse applications. Natural or forced injection of free carriers in a dielectric may change the surface phonon-polariton into a surface phonon-plasmon-polariton. Understanding this effect provides an insight into the fundamental physics of surface electromagnetic waves on dielectrics and offers tools that can be used to develop new technologies. In this contribution, we experimentally study the transition from surface phonon-polariton to surface phonon-plasmon-polariton on a yttrium-doped aluminum nitride polycrystalline substrate by thermal injection of free carriers. We perform this study using reflectivity measurements in the far- and mid-infrared spectral range and at a variable temperature, taking the necessary precautions to eliminate any errors that may arise from measurement artifacts and inaccurate analysis of the spectra. We demonstrate that thermal injection of a significant free carrier density can tune the surface phonon-polariton into a much shorter mean free path surface phonon-plasmon-polariton.

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Section: Resultsmentioning

confidence: 99%

Transition from surface phonon-polariton to surface phonon–plasmon-polariton by thermal injection of free carriers

El-Helou¹,

Wu²,

Bruyant³

et al. 2022

J. Phys.: Condens. Matter

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“…This method is non-destructive, the same as the photoacoustic method [28][29][30][31][32][33], photopyroelectric method [34,35] and beam deflection spectrometry [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Investigations of the Thermal Parameters of Hybrid Sol–Gel Coatings Using Nondestructive Photothermal Techniques

et al. 2022

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This article presents the results of comparative investigations of thermal parameters of hybrid sol–gel coatings (named TMZ) prepared from tetraethyl orthosilicate and organically modified 3-methacryloxypropyltrimethoxysilane. The coatings were prepared with the addition of zirconium(IV) tetrapropoxide chelated with methacrylic acid. Two series of samples were investigated: the first series, TMZ-I, TMZ-II and TMZ-III, with different amounts of zirconium, and the second series, TMZ-I/Ce, TMZ-II/Ce and TMZ-III/Ce, with the addition of cerium nitrate. The influence of the amount of zirconium and cerium on the thermal parameters of the sol–gel coatings was next analyzed. Two non-destructive and photothermal techniques were used for this purpose: photothermal radiometry (PTR) and beam deflection spectroscopy (BDS). The thermal diffusivity and conductivity of the coatings were extracted from the frequency experiments and are presented and discussed. The two-layer model was applied to interpret the photothermal spectra. The results obtained using these two techniques are compared and discussed.

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Temperature dependence of the anisotropy of the infrared dielectric properties and phonon-plasmon coupling in n-doped 4H-SiC

Chahal,

Rahbany,

El-Helou

et al. 2024

Journal of Physics and Chemistry of Solids

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IR photothermal and spectroscopic analysis of proton-irradiated 4H-SiC

Cited by 5 publications

References 44 publications

Transition from surface phonon-polariton to surface phonon–plasmon-polariton by thermal injection of free carriers

Transition from surface phonon-polariton to surface phonon–plasmon-polariton by thermal injection of free carriers

Investigations of the Thermal Parameters of Hybrid Sol–Gel Coatings Using Nondestructive Photothermal Techniques

Temperature dependence of the anisotropy of the infrared dielectric properties and phonon-plasmon coupling in n-doped 4H-SiC

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