Optical Properties of Finely-Structured Particulates

1988 ◽  
Vol 132 ◽  
Author(s):  
Ping Sheng ◽  
Min-Yao Zhou ◽  
Zhe Chen ◽  
S. T. Chui
Keyword(s):  
Optical Properties ◽  
Far Infrared ◽  
Geometric Parameters

ABSTRACTWe show that rod-like particulates structured from interleaving layers of metal and insulator (or semiconductor) can exhibit novel infrared and far-infrared characteristics that are tunable through the variation of their geometric parameters. In particular, a dispersion of these particles can be made to absorb strongly at any prescribed far-infrared frequency by controlling their transverse dimensions and insulator fractions.

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.

Far Infrared Optical Properties of Amorphous As–Se System

1982 ◽  
Vol 21 (Part 1, No. 3) ◽  
pp. 418-423 ◽  
Author(s):  
Seinosuke Onari ◽  
Osamu Sugino ◽  
Michio Kato ◽  
Toshihiro Arai
Keyword(s):  
Optical Properties ◽  
Far Infrared ◽  
Infrared Optical Properties

Optical Properties by Far Infrared Ellipsometry

1968 ◽  
Vol 115 (1) ◽  
pp. 106 ◽  
Author(s):  
Charlie E. Jones ◽  
A. Ray Hilton
Keyword(s):  
Optical Properties ◽  
Far Infrared ◽  
Infrared Ellipsometry

scholarly journals On the Optical Properties of Thin‐Film Vanadium Dioxide from the Visible to the Far Infrared

2019 ◽  
Vol 531 (10) ◽  
pp. 1900188 ◽  
Author(s):  
Chenghao Wan ◽  
Zhen Zhang ◽  
David Woolf ◽  
Colin M. Hessel ◽  
Jura Rensberg ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Vanadium Dioxide ◽  
Far Infrared

Far Infrared Optical Properties of Pressed CdTe

1968 ◽  
Vol 7 (1) ◽  
pp. 213 ◽  
Author(s):  
C. M. Randall ◽  
R. D. Rawcliffe
Keyword(s):  
Optical Properties ◽  
Far Infrared ◽  
Infrared Optical Properties

Far infrared and microwave optical properties of vitreous As2Se3

1970 ◽  
Vol 8 (21) ◽  
pp. 1783-1787 ◽  
Author(s):  
P.C. Taylor ◽  
S.G. Bishop ◽  
D.L. Mitchell
Keyword(s):  
Optical Properties ◽  
Far Infrared
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