scholarly journals Low-Temperature Optical Properties of Silicate Particles in the Far-Infrared Region

2001 ◽  
Vol 53 (2) ◽  
pp. 243-250 ◽  
Author(s):  
Hiroki Chihara ◽  
Chiyoe Koike ◽  
Akira Tsuchiyama
Keyword(s):  
Optical Properties ◽  
Low Temperature ◽  
Far Infrared ◽  
Infrared Region

scholarly journals Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

Optical Properties of Doped Cd1−xMnxTe

1986 ◽  
Vol 89 ◽  
Author(s):  
Y. Lansari ◽  
N. C. Giles ◽  
J. F. Schetzina ◽  
P. Becia ◽  
D. Kaiser
Keyword(s):  
Optical Properties ◽  
Low Temperature ◽  
Spectral Range ◽  
Room Temperature ◽  
Far Infrared ◽  
Optical Quality ◽  
Structural Quality ◽  
Reflectance Measurements ◽  
Low Temperature Photoluminescence

AbstractThe introduction of phosphorus and arsenic dopants into bulk Cd1−xMnx Te crystals grown by the Bridgman-Stockbarger technique has been studieA-with respect to the resulting optical properties. Samples with a Mn composition in the range 0.10 < x < 0.30, both as-grown and annealed, were investigated. A combination of room temperature transmittance and reflectance measurements over the spectral range from the ultraviolet to the far infrared has been used to gain information concerning the structural quality of the samples. Low temperature photoluminescence measurements (1.6−5 K) were used to determine optical quality and excitonic energies.

Reststrahlen of Alkali Halides in the Far-Infrared Region

1973 ◽  
Vol 51 (17) ◽  
pp. 1898-1899
Author(s):  
A. F. Leung
Keyword(s):  
Optical Properties ◽  
Harmonic Oscillator ◽  
Alkali Halides ◽  
Far Infrared ◽  
Infrared Region ◽  
Oscillator Model ◽  
Simple Harmonic Oscillator ◽  
Harmonic Oscillator Model

The assumption in deriving the Lyddane–Sachs–Teller relation and the simple harmonic oscillator model do not hold well in the understanding of the optical properties of alkali halides in the far-infrared region.

THE LOW-TEMPERATURE OPTICAL PROPERTIES OF TTF-TCNQ IN THE FAR-INFRARED

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1469-C3-1472
Author(s):  
J. E. Eldridge ◽  
F. E. Bâtes
Keyword(s):  
Optical Properties ◽  
Low Temperature ◽  
Far Infrared

Optical Properties of the Quaternary II–VI Mixed Crystals in the Far Infrared Region

1985 ◽  
Vol 128 (2) ◽  
pp. 389-400 ◽  
Author(s):  
V. M. Burlakov ◽  
A. P. Litvinchuk ◽  
V. N. Pyrkov ◽  
G. G. Tarasov ◽  
N. I. Vitrikhovskii
Keyword(s):  
Optical Properties ◽  
Far Infrared ◽  
Infrared Region ◽  
Mixed Crystals
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