Shapes of oxygen absorption lines in the microwave frequency region

1963 ◽  
Vol 68 (11) ◽  
pp. 3431-3435 ◽  
Author(s):  
L. F. Stafford ◽  
C. W. Tolbert
Keyword(s):  
Microwave Frequency ◽  
Frequency Region ◽  
Absorption Lines ◽  
Oxygen Absorption

CLASSICAL ELECTROMAGNETICALLY-INDUCED TRANSPARENCY-LIKE SWITCHING CONTROLLED BY POLARIZATION IN METAMATERIALS

2013 ◽  
Vol 22 (01) ◽  
pp. 1350004 ◽  
Author(s):  
XING RI JIN ◽  
JINWOO PARK ◽  
HAIYU ZHENG ◽  
YOUNGPAK LEE ◽  
JOO YULL RHEE ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetically Induced Transparency ◽  
Microwave Frequency ◽  
Dielectric Substrate ◽  
Frequency Region ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Incident Electromagnetic Wave ◽  
Induced Transparency

The classical electromagnetically-induced transparency (EIT)-like switching in metamaterials was experimentally demonstrated in the microwave-frequency region. The metameterial unit cell consists of two identical split-ring resonators, which are arranged on both sides of a dielectric substrate with 90°-rotation asymmetry. In our scheme, the classical EIT-like switching can be achieved by changing the polarization of the incident electromagnetic wave.

The Rotational Spectrum of Monothioformic Acid. I. cis-and trans-HC(:O)SH1,2

1976 ◽  
Vol 31 (5) ◽  
pp. 422-437
Author(s):  
William H. Hocking ◽  
Gisbert Winnewisser
Keyword(s):  
Frequency Region ◽  
Absorption Lines ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Astrophysical Interest ◽  
Rotational Spectra ◽  
Measured Line ◽  
Centrifugal Distortion Constants ◽  
Cis And Trans ◽  
Line Positions

Abstract The rotational spectra of the two abundant isomers of monothioformic acid, cis- and trans- HC(:O)SH, have been assigned in the frequency region 8 -250 GHz. Over 90 a-type transitions and over 60 b-type transitions have been measured for each rotamer. The a-type transitions belong to the qRK , qQ1, qQ2, qQ3 and qQ4 branches and the b-type absorption lines encompass the Ka = 1 - 0, 2 - 1, 3 - 2, 4 - 3 and 5 - 4 rotational sub-bands. The rotational constants and all quartic and sextic centrifugal distortion constants have been determined for each rotamer using Watson's reduced Hamiltonian. In addition to the measured line positions the frequencies of some selected low-J transitions, not observed in this work but of potential astrophysical interest, have been listed as an aid in the interstellar search for monothioformic acid.

Experiments of Negative-Index Refraction in Optical Frequency Region

2010 ◽  
Vol 437 ◽  
pp. 575-579
Author(s):  
Jia Bi Chen ◽  
Bin Ming Liang ◽  
Da Wei Zhang ◽  
Song Lin Zhuang
Keyword(s):  
Photonic Crystal ◽  
Smart Materials ◽  
Microwave Frequency ◽  
Frequency Region ◽  
Optical Frequency ◽  
Negative Index ◽  
Transmitted Beam ◽  
Negative Index Materials ◽  
New Class ◽  
Significant Attention

Recently, significant attention has been devoted to a new class of smart materials – so-called negative-index materials (NIM). There are some direct experimental demonstrations of NIM in the microwave frequency region, but not in optical frequency region. Here we report a kind of optical negative-index material which is 2D photonic crystal and, by measuring the refractive angle of the transmitted beam through a prism fabricated from this material, we determine the effective n. These experiments directly confirm this material is an optical negative-index one.

The use of saturation dip absorption in microwave spectroscopy and in microwave frequency stabilization

1969 ◽  
Vol 47 (21) ◽  
pp. 2431-2433 ◽  
Author(s):  
C. C. Costain
Keyword(s):  
Laser Field ◽  
Microwave Frequency ◽  
Frequency Stabilization ◽  
Microwave Spectroscopy ◽  
Absorption Lines ◽  
Microwave Frequencies

An experiment is described which shows that the saturation dip technique (often termed the Lamb dip, in the laser field) can be used at microwave frequencies to identify the centers of absorption lines very precisely. The use of this technique in microwave spectroscopy is illustrated and the possibility of using this technique to stabilize oscillators is discussed.

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