Measurement of far-infrared optical constants by ATR

1985 ◽  
Vol 6 (4) ◽  
pp. 287-306 ◽  
Author(s):  
S. Ikawa ◽  
T. Ohba ◽  
S. Tanaka ◽  
Y. Morimoto ◽  
K. Fukushi ◽  
...  
Keyword(s):  
Optical Constants ◽  
Far Infrared

Far-infrared optical constants of a selection of zincblende structure crystals at 300 K

1991 ◽  
Vol 32 ◽  
pp. 303-310 ◽  
Author(s):  
K.A. Maslin ◽  
C. Patel ◽  
T.J. Parker
Keyword(s):  
Optical Constants ◽  
Far Infrared ◽  
Selection Of

Development of short-wavelength far-infrared lasers and measurement of optical constants

2005 ◽  
Vol 153 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Kazuya Nakayama ◽  
Hisaki Tazawa ◽  
Shigeki Okajima ◽  
Kazuo Kawahata ◽  
Kenji Tanaka ◽  
...  
Keyword(s):  
Short Wavelength ◽  
Optical Constants ◽  
Far Infrared ◽  
Infrared Lasers ◽  
Far Infrared Lasers

scholarly journals Far-infrared continuum absorption of forsterite and enstatite at low temperatures

2019 ◽  
Vol 625 ◽  
pp. A61
Author(s):  
Harald Mutschke ◽  
Pierre Mohr
Keyword(s):  
Low Temperatures ◽  
Optical Constants ◽  
Laboratory Data ◽  
Measurement Data ◽  
Far Infrared ◽  
Absorption Bands ◽  
Lack Of Information ◽  
Temperature Dependences ◽  
Cold Dust ◽  
Infrared Continuum

Context. The far-infrared continuum opacity of cold dust is an important quantity for the study of debris disks in planetary systems and of protoplanetary disks. Forsterite and enstatite are considered to be the most abundant crystalline dust species in such environments. Aims. The optical constants of these minerals at wavelengths above 80 μm, which govern the opacity, and their temperature dependence are poorly known. Our aim is to fill in this lack of information with new laboratory data. Methods. We present spectroscopic transmission measurements on forsterite and enstatite single crystals of up to 10 mm thickness at wavelengths between 45 and 500 μm and for temperatures down to 10 K. We compare our results to literature data originating from powder transmission and from reflection spectroscopy. Results. The imaginary parts of the refractive indices calculated from the measurements show very strong temperature dependences, which to that extent are not seen in reflection-based data or in powder measurement data. The temperature dependences can be described by a simple theoretical model taking the contributions of single-phonon absorption and phonon difference processes into account. We also observe, for the first time, enstatite absorption bands at 87.5 μm and 116.6 μm wavelengths. Conclusions. The single-crystal optical constants of forsterite and enstatite predict an extremely small submillimeter opacity of crystalline silicate dust at low temperatures, which would make these particles almost invisible in the thermal radiation of cold dust. Thus, it is important to understand why absorption measurements with mineral powders resulted in much higher opacity values.

scholarly journals Far-infrared optical constants of ZnO and ZnO/Ag nanostructures

RSC Advances ◽  
2014 ◽  
Vol 4 (40) ◽  
pp. 20902-20908 ◽  
Author(s):  
Reza Zamiri ◽  
Avito Rebelo ◽  
Golriz Zamiri ◽  
Atena Adnani ◽  
Ajay Kuashal ◽  
...  
Keyword(s):  
Optical Constants ◽  
Far Infrared ◽  
Cost Effective ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Ag Nanoparticle ◽  
Wet Chemical ◽  
Wet Chemical Precipitation

We report on the synthesis of ZnO nanoplates and ZnO nanoplate/Ag nanoparticle heterostructures via a simple and cost effective wet chemical precipitation method.

The optical constants of pure fused quartz in the far-infrared

1978 ◽  
Vol 18 (3) ◽  
pp. 215-219 ◽  
Author(s):  
T.J. Parker ◽  
J.E. Ford ◽  
W.G. Chambers
Keyword(s):  
Optical Constants ◽  
Far Infrared ◽  
Fused Quartz

Far-Infrared Radiation Modulators Using High-Tc Superconductors

1998 ◽  
Vol 120 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Z. M. Zhang
Keyword(s):  
Thin Films ◽  
Experimental Study ◽  
Normal State ◽  
Infrared Radiation ◽  
Optical Constants ◽  
Far Infrared ◽  
High Tc Superconductors ◽  
High Tc ◽  
Future Experimental Study ◽  
Far Infrared Radiation

The potential of using high-Tc superconductors as intensity modulators for far-infrared radiation is investigated in this work. Reflectance and transmittance for several design structures are computed using the published optical constants of the superconductor YBa2Cu3O7 and substrate materials. Notable differences in the reflectance and transmittance between the superconducting state and the normal state are illustrated. The best results are obtained based on the reflectance of thin films (10 nm–50 nm thick) on thin substrates (less than 100 μm thick) and for radiation incident on the substrate. This study demonstrates that high-Tc superconductive thin films can be used to build far-infrared radiation modulators. Future experimental study is recommended in order to materialize this promising thermo-optical device.

Sign in / Sign up

Export Citation Format

Share Document