Dielectric tensor of monoclinic Ga2O3 single crystals in the spectral range 0.5–8.5 eV

C. Sturm; J. Furthmüller; F. Bechstedt; R. Schmidt-Grund; M. Grundmann

doi:10.1063/1.4934705

Temperature dependence of the dielectric tensor of monoclinic Ga2O3 single crystals in the spectral range 1.0–8.5 eV

Applied Physics Letters ◽

10.1063/1.4999763 ◽

2017 ◽

Vol 111 (8) ◽

pp. 082102 ◽

Cited By ~ 7

Author(s):

C. Sturm ◽

R. Schmidt-Grund ◽

V. Zviagin ◽

M. Grundmann

Keyword(s):

Temperature Dependence ◽

Single Crystals ◽

Spectral Range ◽

Dielectric Tensor

Download Full-text

Influence of two-photon processes on the nonlinear optical response of polydiacetylene single crystals in the near-resonant spectral range

Chemical Physics ◽

10.1016/0301-0104(95)00005-4 ◽

1996 ◽

Vol 204 (1) ◽

pp. 147-155 ◽

Cited By ~ 6

Author(s):

Wolfgang Schmid ◽

Thomas Vogtmann ◽

Markus Schwoerer

Keyword(s):

Single Crystals ◽

Spectral Range ◽

Nonlinear Optical ◽

Optical Response ◽

Nonlinear Optical Response ◽

Two Photon

Download Full-text

Time-resolved luminescence and excitation spectroscopy of Co-doped Gd3Ga3Al2O12 scintillating crystals

Scientific Reports ◽

10.1038/s41598-020-77451-x ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Viktorija Pankratova ◽

Anna P. Kozlova ◽

Oleg A. Buzanov ◽

Kirill Chernenko ◽

Roman Shendrik ◽

...

Keyword(s):

Single Crystals ◽

Spectral Range ◽

Luminescence Decay ◽

Luminescence Spectroscopy ◽

Bandgap Energy ◽

Decay Kinetics ◽

Excitation Spectra ◽

Absorption Bands ◽

Time Resolved ◽

Co Doped

AbstractCerium doped Gd3Ga3Al2O12 (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg2+, Ca2+) and tetravalent (Zr4+, Ti4+) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce3+, Gd3+ and excitonic absorption bands. The influence of the co-dopant ions on the Ce3+ luminescence decay kinetics is elucidated. The fastest luminescence decay was observed for the Mg2+ co-doped crystals under any excitation below bandgap energy indicating the perturbation of the 5d states of Ce3+ by Mg2+ ions. Synchrotron radiation was utilized for the luminescence excitation in the energy range from 4.5 to 800 eV. Special attention was paid to the analysis of Ce3+ excitation spectra in VUV and XUV spectral range where multiplication of electronic excitation (MEE) processes occur. Our results demonstrated that GGAG:Ce single crystals co-doped by Mg2+ ions as well as the GGAG:Ce crystal annealed in vacuum reveal the most efficient excitation of Ce3+ emission in VUV-XUV excitation range. The role of intrinsic defects in MEE processes in the co-doped as well as in the annealed GGAG:Ce single crystals is discussed.

Download Full-text

Ellipsometric Study of Anisotropy Permittivity of Hexagonal Manganites RMnO3 (R = Ho, Tm, Yb)

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.190.273 ◽

2012 ◽

Vol 190 ◽

pp. 273-276 ◽

Cited By ~ 1

Author(s):

A.A. Makhnev ◽

L.V. Nomerovannaya ◽

Natalia N. Loshkareva ◽

A.M. Balbashov

Keyword(s):

Single Crystals ◽

Absorption Edge ◽

Near Infrared ◽

Fundamental Absorption Edge ◽

Dielectric Tensor ◽

Broad Absorption ◽

Intense Band ◽

Broad Absorption Band ◽

Ellipsometric Study ◽

Hexagonal Manganites

The optical properties of single crystals of the hexagonal manganites RMnO3 (R = Ho, Tm, Yb) have been investigated by spectroscopic ellipsometry in the spectral range 0.6-5.0 eV. The measurements show a strong anisotropy of the diagonal elements of the dielectric tensor. It has been demonstrated that the optical absorption edge for the polarization Ec was determined by the intense band of O(2p)Mn (3d) transition centered near 1.6 eV, whereas this band for the polarization Ec was strongly suppressed and shifted toward higher energies by 0.15-0.20 eV. The spectral dependences of the ε1(E) and ε2(E) for HoMnO3, TmMnO3 and YbMnO3 single crystals were qualitatively similar. The broad absorption band at E<1.0 eV clearly appears at the energies below the fundamental absorption edge of all of study compounds. It is possible, the origin of the near-infrared ε2(E) absorption is associated with 4f-4f transitions of R3+ ions.

Download Full-text

Determination of the dielectric constant of YBa2Cu3O7−δ single crystals in the 10 μm spectral range by SEW phase spectroscopy

Physics Letters A ◽

10.1016/0375-9601(88)90779-7 ◽

1988 ◽

Vol 133 (3) ◽

pp. 163-166 ◽

Cited By ~ 8

Author(s):

A.F. Goncharov ◽

G.N. Zhizhin ◽

S.A. Kiselev ◽

L.A. Kuzik ◽

V.A. Yakovlev

Keyword(s):

Dielectric Constant ◽

Single Crystals ◽

Spectral Range

Download Full-text

Обертонное комбинационное рассеяние света в монокристаллах танталата лития

Журнал технической физики ◽

10.21883/os.2019.10.48352.168-19 ◽

2019 ◽

Vol 127 (10) ◽

pp. 532

Author(s):

С.Д. Абдурахмонов ◽

В.С. Горелик

Keyword(s):

Raman Scattering ◽

Single Crystal ◽

Single Crystals ◽

Raman Spectra ◽

Spectral Range ◽

Lithium Tantalate ◽

Raman Scattering Spectrum ◽

Scattering Intensity ◽

Scattering Spectrum ◽

Scattering Geometry

AbstractOvertone bands in the spectral range of 1300−1920 cm^–1 have been found in Raman scattering spectrum of lithium tantalate single crystals. The Raman spectra were recorded in the 180° scattering geometry. The intensity of overtone transitions differs for different samples and, in some cases, is comparable with the Raman scattering intensity at the fundamental modes of a lithium tantalate single crystal.

Download Full-text

Polarized IR reflectance spectroscopy methods for the orientation of monoclinic single crystals: Tutton salts as a case example

Macedonian Journal of Chemistry and Chemical Engineering ◽

10.20450/mjcce.2014.477 ◽

2014 ◽

Vol 33 (1) ◽

pp. 27 ◽

Cited By ~ 2

Author(s):

Vladimir Ivanovski

Keyword(s):

Single Crystals ◽

Reflectance Spectra ◽

Dielectric Tensor ◽

Cross Polarization ◽

Crystal Axis ◽

X Ray ◽

Principal Axes ◽

Ir Reflectance ◽

Ray Methods ◽

Low Symmetry

Investigation of polarized IR reflectance spectra of single crystals is important in the course of obtaining vibrational, optical and dielectric properties of solid state samples. Diffraction X-ray methods are usually employed for crystal orientation. In this work, two IR reflectance methods are proposed as a supplement in testing the orientation of the b crystal axis and by that the ac crystal plane, in respect to the morphology of monoclinic single crystals. The methods were tested on two Tutton salt single crystals: K2Ni(SO4)2·6H2O and K2Ni(SeO4)2·6H2O and were further compared with the cross-polarization IR reflectance method. Both methods rely on the symmetry and optical properties of monoclinic single crystals. One of them takes into account the fact that one of the principal axes of the dielectric tensor is symmetry fixed, while the other employs the conditions for the appearance of an isosbestic-like point i.e. isosbestic-like region in the polarized IR reflectance spectra of single crystals with low symmetry.

Download Full-text

Эффект Фарадея в феррит-шпинели CoFe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- в ИК-диапазоне

Письма в журнал технической физики ◽

10.21883/pjtf.2019.12.47912.17768 ◽

2019 ◽

Vol 45 (12) ◽

pp. 19

Author(s):

А.В. Телегин ◽

Ю.П. Сухоруков ◽

В.Д. Бессонов ◽

С.В. Наумов

Keyword(s):

Single Crystals ◽

Spectral Range ◽

Faraday Effect ◽

Infrared Range ◽

Q Factor ◽

Physical Mechanisms

The spectral, temperature and field dependences of the Faraday effect for single crystals of ferrimagnetic spinel CoFe2O4 are studied in the infrared range. It is shown that the magneto-optical q-factor of CoFe2O4 varies from -600/dB до +200/dB in the spectral range from 1.5 μm to 10 μm and weakly depends on temperature from 200 K to 300 K. The physical mechanisms responsible for the observed Faraday effect are proposed.

Download Full-text

Пропускание кристаллов CsI, AgCl, КРС-5, КРС-6 в терагерцовой области спектра

Оптика и спектроскопия ◽

10.21883/os.2021.06.50992.1831-21 ◽

2021 ◽

Vol 129 (6) ◽

pp. 773

Author(s):

И.А. Каплунов ◽

Г.И. Кропотов ◽

В.Е. Рогалин ◽

А.А. Шахмин

Keyword(s):

Single Crystals ◽

Attenuation Coefficient ◽

Spectral Range ◽

Spectral Region ◽

Optical Quality ◽

Thz Radiation

The spectral dependences of the transmittance of CsI, AgCl, KRS-5 and KRS-6 single crystals in the infrared (IR) and terahertz (THz) ranges have been measured. The spectral dependences of the absorption (attenuation) coefficient of these crystals were calculated in the spectral range of 200–3000 μm. It was found, that these crystals are transparent in the millimeter range, which makes it possible to use materials when working with THz radiation. It should be noted that, in contrast to the IR spectral region, the optical quality of the surface of the crystal samples practically does not affect the transmission in the millimeter range.

Download Full-text