scholarly journals Glassy dynamics of sorbitol solutions at terahertz frequencies

2013 ◽  
Vol 15 (28) ◽  
pp. 11931 ◽  
Author(s):  
Juraj Sibik ◽  
Evgenyi Y. Shalaev ◽  
J. Axel Zeitler
Keyword(s):  
Glassy Dynamics ◽  
Terahertz Frequencies

Modelling and simulation of novel liquid-infiltrated PCF biosensor in Terahertz frequencies

2020 ◽  
Vol 14 (6) ◽  
pp. 411-416
Author(s):  
Nurul Awadah Nadiah Binti Suhaimi ◽  
Izaddeen Kabir Yakasai ◽  
Emeroylariffion Abas ◽  
Shubi Kaijage ◽  
Feroza Begum
Keyword(s):  
Modelling And Simulation ◽  
Terahertz Frequencies

scholarly journals Estimation methods to extract complex permittivity from transmission coefficient in the terahertz band

2021 ◽  
Vol 53 (8) ◽  
Author(s):  
Chuang Yang ◽  
Jian Wang ◽  
Cheng Yang
Keyword(s):  
Transmission Coefficient ◽  
Iterative Algorithm ◽  
Complex Permittivity ◽  
Free Space ◽  
Estimation Methods ◽  
Extraction Technique ◽  
Initial Value ◽  
Terahertz Band ◽  
Terahertz Frequencies

AbstractIn this paper, the characteristics of the transmission coefficient (S$$_{21}$$ 21 ) measured in free-space at terahertz frequencies are analyzed. The analysis results are used to estimate the permittivity of the material under test, and the estimated permittivity is adopted as an initial-value for the iterative algorithm to extract the complex permittivity of the material from the S$$_{21}$$ 21 . The iterative extraction technique based on the estimation is efficient, while the iterative extraction technique without the estimation is inefficient. Various known materials in the literature are used to validate the technique in the terahertz band.

scholarly journals Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

2021 ◽  
Author(s):  
Michael Janssen ◽  
Heino Falcke ◽  
Matthias Kadler ◽  
Eduardo Ros ◽  
Maciek Wielgus ◽  
...  
Keyword(s):  
Black Holes ◽  
Event Horizon ◽  
Galactic Nuclei ◽  
Galactic Centre ◽  
Radio Jets ◽  
Long Baseline ◽  
Wide Range ◽  
Terahertz Frequencies ◽  
Source Structure ◽  
Centaurus A

AbstractVery-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimetre wavelengths have the power to reveal the launching and initial collimation region of extragalactic radio jets, down to 10–100 gravitational radii (rg ≡ GM/c2) scales in nearby sources1. Centaurus A is the closest radio-loud source to Earth2. It bridges the gap in mass and accretion rate between the supermassive black holes (SMBHs) in Messier 87 and our Galactic Centre. A large southern declination of −43° has, however, prevented VLBI imaging of Centaurus A below a wavelength of 1 cm thus far. Here we show the millimetre VLBI image of the source, which we obtained with the Event Horizon Telescope at 228 GHz. Compared with previous observations3, we image the jet of Centaurus A at a tenfold higher frequency and sixteen times sharper resolution and thereby probe sub-lightday structures. We reveal a highly collimated, asymmetrically edge-brightened jet as well as the fainter counterjet. We find that the source structure of Centaurus A resembles the jet in Messier 87 on ~500 rg scales remarkably well. Furthermore, we identify the location of Centaurus A’s SMBH with respect to its resolved jet core at a wavelength of 1.3 mm and conclude that the source’s event horizon shadow4 should be visible at terahertz frequencies. This location further supports the universal scale invariance of black holes over a wide range of masses5,6.

Heterodyne measurements of a NbN superconducting hot electron mixer at terahertz frequencies

1999 ◽  
Vol 9 (2) ◽  
pp. 3757-3760 ◽  
Author(s):  
P. Yagoubov ◽  
M. Kroug ◽  
H. Merkel ◽  
E. Kollberg ◽  
J. Schubert ◽  
...  
Keyword(s):  
Hot Electron ◽  
Terahertz Frequencies
Sign in / Sign up

Export Citation Format

Share Document