Temperature dependence of free carriers and optical phonons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LiInSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>in the terahertz frequency regime

Liang, Qijun; Wang, Shanpeng; Tao, Xutang; Dekorsy, Thomas

doi:10.1103/physrevb.92.144303

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…Different works [46,47], studying gold nanoparticles, claimed that interband terms should have minimal or no effect on plasmon absorption with temperature since interband transition energies (typically of the order of the eV) are very high compared to vibrational energy (∼ 10 −2 eV). Our results and some recent experimental works performed on different materials (ultrathin Au films [15], bis(ethylenedithio)tetrathiafulvalene [48], BSTS [49], LiInSe [14],) suggest a temperature dependence for interband terms contradicting the previous statement. Usually a parametric approach is preferred [48,14] to fit the experimental observations, performed by an ad hoc change of Lorentz-Drude parameters.…”

Section: Temperature Dependent Ld Modelscontrasting

confidence: 99%

“…Our results and some recent experimental works performed on different materials (ultrathin Au films [15], bis(ethylenedithio)tetrathiafulvalene [48], BSTS [49], LiInSe [14],) suggest a temperature dependence for interband terms contradicting the previous statement. Usually a parametric approach is preferred [48,14] to fit the experimental observations, performed by an ad hoc change of Lorentz-Drude parameters. On the contrary, we preferred to reduce the number of free parameters, keeping the TD for Drude parameters.…”

Section: Temperature Dependent Ld Modelscontrasting

confidence: 99%

“…The reason could lie on the complexity to explain the temperature dependence (TD, hereafter) of damping and optical phonons for complex band structures [13,4]. Recently some experimental works have preferred a parametric approach to describe the TD of optical properties of matter [14,15], by varying ad hoc TDLD parameters instead of using analytical formulae.…”

Section: Introductionmentioning

confidence: 99%

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The temperature dependence of optical properties of tungsten in the visible and near-infrared domains: an experimental and theoretical study

Minissale¹,

Pardanaud²,

Bisson³

et al. 2017

J. Phys. D: Appl. Phys.

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The knowledge of optical properties of tungsten at high temperatures is of crucial importance in fields such as nuclear fusion or aerospace applications. The optical properties of tungsten are well known at room temperature, but little has been done at temperatures comprised between 300 K and 1000 K in the visible and near-infrared domains. Here we investigate the temperature dependence of tungsten reflectivity from the ambient to high temperatures (<1000 K) in the 500-1050 nm spectral range, a region where interband transitions have a strong contribution. Experimental measurements, performed via a spectroscopic system coupled with a laser remote heating, show that the tungsten reflectivity increases with temperature and wavelength. We have described these dependences through a Fresnel and two Lorentz-Drude models. The Fresnel model reproduces accurately the experimental curve at a given temperature, but it is able to simulate the temperature dependency of reflectivity only thanks to an ad hoc choice of temperature formulae for the refractive indexes. Thus, a less empirical approach is preferred based on Lorentz-Drude models to describe the interaction of light and charge carriers in the solid. The first Lorentz-Drude model, which includes a temperature dependency on intraband transitions, fits experimental results only qualitatively. The second Lorentz-Drude model includes in addition a temperature dependency on interband transitions. It is able to reproduce quantitatively the experimental results, highlighting a non-trivial dependence of interband transitions as a function of temperature. Eventually, we use these temperature dependent Lorentz-Drude models to evaluate the total emissivity of tungsten from 300 K to 3500 K and we compare our experimental and theoretical findings with previous results.

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Section: Temperature Dependent Ld Modelscontrasting

confidence: 99%

Section: Temperature Dependent Ld Modelscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The temperature dependence of optical properties of tungsten in the visible and near-infrared domains: an experimental and theoretical study

Minissale¹,

Pardanaud²,

Bisson³

et al. 2017

J. Phys. D: Appl. Phys.

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“…Lithium niobate crystals have a phonon vibration at 7.7 THz which contributes the major absorption for our interest frequency range [29]. THz polarized along the ordinary shows a higher absorption coefficient than those polarized along the extraordinary polarization at 300 K. In order to clarify the variation of the refractive index and absorption coefficient with the temperature [30], we plot the differences in refractive index and absorption coefficient for extraordinary polarization as a function of the temperature change, shown in Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

Temperature dependent refractive index and absorption coefficient of congruent lithium niobate crystals in the terahertz range

Zhou

Huang

et al. 2015

Opt. Express

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Optical rectification with tilted pulse fronts in lithium niobate crystals is one of the most promising methods to generate terahertz (THz) radiation. In order to achieve higher optical-to-THz energy efficiency, it is necessary to cryogenically cool the crystal not only to decrease the linear phonon absorption for the generated THz wave but also to lengthen the effective interaction length between infrared pump pulses and THz waves. However, the refractive index of lithium niobate crystal at lower temperature is not the same as that at room temperature, resulting in the necessity to re-optimize or even re-build the tilted pulse front setup. Here, we performed a temperature dependent measurement of refractive index and absorption coefficient on a 6.0 mol% MgO-doped congruent lithium niobate wafer by using a THz time-domain spectrometer (THz-TDS). When the crystal temperature was decreased from 300 K to 50 K, the refractive index of the crystal in the extraordinary polarization decreased from 5.05 to 4.88 at 0.4 THz, resulting in ~1° change for the tilt angle inside the lithium niobate crystal. The angle of incidence on the grating for the tilted pulse front setup at 1030 nm with demagnification factor of −0.5 needs to be changed by 3°. The absorption coefficient decreased by 60% at 0.4 THz. These results are crucial for designing an optimum tilted pulse front setup based on lithium niobate crystals.

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“…At 300 K, CSP has a more strongly varying absorption than the other crystals, which competes with a strong background absorption that is reduced by cooling. The temperature-dependent absorption results from higher free-carrier concentrations at higher temperatures [29]. A Lorentzian function is used to fit the data, with extracted center frequencies plotting in Figure 2(f).…”

Section: Refractive Index and Absorptionmentioning

confidence: 99%

Carrier transport and electron–lattice interactions of nonlinear optical crystals CdGeP₂, ZnGeP₂, and CdSiP₂

et al. 2021

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Terahertz time-domain spectroscopy is employed to investigate temperaturedependent properties of bulk chalcopyrite crystals (CdGeP2, ZnGeP2 and CdSiP2). The complex spectra provide the refraction and absorption as a function of temperature, from which electron-phonon coupling and average phonon energies are extracted and linked to the mechanics of the A-and B-site cations. Also, AC conductivity spectra provide carrier densities and electron scattering times, the temperature dependence of which is associated with unintentional shallow dopants. Temperature dependence of the scattering time are converted into carrier mobility and modeled with microscopic transport mechanisms such as polar optical phonon, acoustic phonons, deformation potential, ionized impurity and dislocation scattering. Hence, analysis links the THz optical and electronic properties to relate microscopic carrier transport and carrier-lattice interactions.

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Temperature dependence of free carriers and optical phonons inLiInSe2in the terahertz frequency regime

Cited by 5 publications

References 22 publications

The temperature dependence of optical properties of tungsten in the visible and near-infrared domains: an experimental and theoretical study

The temperature dependence of optical properties of tungsten in the visible and near-infrared domains: an experimental and theoretical study

Temperature dependent refractive index and absorption coefficient of congruent lithium niobate crystals in the terahertz range

Carrier transport and electron–lattice interactions of nonlinear optical crystals CdGeP₂, ZnGeP₂, and CdSiP₂

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Temperature dependence of free carriers and optical phonons inLiInSe2in the terahertz frequency regime

Cited by 5 publications

References 22 publications

The temperature dependence of optical properties of tungsten in the visible and near-infrared domains: an experimental and theoretical study

The temperature dependence of optical properties of tungsten in the visible and near-infrared domains: an experimental and theoretical study

Temperature dependent refractive index and absorption coefficient of congruent lithium niobate crystals in the terahertz range

Carrier transport and electron–lattice interactions of nonlinear optical crystals CdGeP2, ZnGeP2, and CdSiP2

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Carrier transport and electron–lattice interactions of nonlinear optical crystals CdGeP₂, ZnGeP₂, and CdSiP₂