Simple experimental setup for double-pulse and two-dimensional terahertz spectroscopy

2020 ◽  
Vol 128 (19) ◽  
pp. 195107
Author(s):  
B. E. Knighton ◽  
S. A. Sorenson ◽  
J. A. Johnson
Keyword(s):  
Terahertz Spectroscopy ◽  
Double Pulse ◽  
Experimental Setup ◽  
Two Dimensional

scholarly journals Terahertz characterization of two-dimensional low-conductive layers enabled by metal gratings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Prashanth Gopalan ◽  
Yunshan Wang ◽  
Berardi Sensale-Rodriguez
Keyword(s):  
Optical Transmission ◽  
Terahertz Spectroscopy ◽  
Design Guidelines ◽  
Two Dimensional ◽  
Highly Sensitive ◽  
Transmission Measurements ◽  
Metal Gratings ◽  
Low Sensitivity ◽  
Non Destructive

AbstractWhile terahertz spectroscopy can provide valuable information regarding the charge transport properties in semiconductors, its application for the characterization of low-conductive two-dimensional layers, i.e., σs <  < 1 mS, remains elusive. This is primarily due to the low sensitivity of direct transmission measurements to such small sheet conductivity levels. In this work, we discuss harnessing the extraordinary optical transmission through gratings consisting of metallic stripes to characterize such low-conductive two-dimensional layers. We analyze the geometric tradeoffs in these structures and provide physical insights, ultimately leading to general design guidelines for experiments enabling non-contact, non-destructive, highly sensitive characterization of such layers.

scholarly journals Two-color two-dimensional terahertz spectroscopy: A new approach for exploring even-order nonlinearities in the nonperturbative regime

2021 ◽  
Vol 154 (15) ◽  
pp. 154203
Author(s):  
Michael Woerner ◽  
Ahmed Ghalgaoui ◽  
Klaus Reimann ◽  
Thomas Elsaesser
Keyword(s):  
Terahertz Spectroscopy ◽  
Two Dimensional ◽  
New Approach ◽  
Even Order

scholarly journals Исследование параметров двумерного электронного газа в квантовых ямах InGaN/GaN методом терагерцового плазмонного резонанса

2021 ◽  
Vol 55 (11) ◽  
pp. 1059
Author(s):  
Е.Р. Бурмистров ◽  
Л.П. Авакянц
Keyword(s):  
Quantum Wells ◽  
Terahertz Spectroscopy ◽  
Radiation Power ◽  
Electron Gas ◽  
Femtosecond Laser Pulses ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Plasmon Resonances ◽  
Dimensional Electron Gas

A new approach to determining the parameters of a two-dimensional electron gas in InGaN/GaN quantum wells is proposed. It is based on the method of terahertz spectroscopy with time resolution, within the framework of which the terahertz frequencies of two-dimensional plasmon resonances excited in the studied samples of InGaN/AlGaN/GaN heterostructures by femtosecond laser pulses at a wavelength of 797 nm were recorded. Oscillating behavior of the output terahertz radiation power with minima in the frequency range 1−5 THz is shown, which is associated with the excitation of plasmon oscillations in a two-dimensional electron gas localized in an InGaN/GaN quantum well. During the processing of terahertz spectra, the effect of renormalization of the effective mass of two-dimensional electron gas, as well as phase modulation near the frequencies of plasmon resonances with an increase in the temperature of the sample from 90 to 170 K, was found. The proposed method is non-contact and can be used in a wide temperature range.

scholarly journals Two-dimensional-Raman-terahertz spectroscopy of water: Theory

2012 ◽  
Vol 136 (9) ◽  
pp. 094516 ◽  
Author(s):  
Peter Hamm ◽  
Janne Savolainen
Keyword(s):  
Terahertz Spectroscopy ◽  
Two Dimensional

Two-Dimensional Terahertz Spectroscopy of Collective Excitations in Solids

2021 ◽  
Author(s):  
Brittany E. Knighton ◽  
Megan F. Nielson ◽  
Lauren R. Davis ◽  
Aldair Alejandro ◽  
Emma Nelson ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Collective Excitations ◽  
Two Dimensional

scholarly journals Ultrafast two-dimensional terahertz spectroscopy of elementary excitations in solids

2013 ◽  
Vol 15 (2) ◽  
pp. 025039 ◽  
Author(s):  
Michael Woerner ◽  
Wilhelm Kuehn ◽  
Pamela Bowlan ◽  
Klaus Reimann ◽  
Thomas Elsaesser
Keyword(s):  
Terahertz Spectroscopy ◽  
Two Dimensional ◽  
Elementary Excitations

Experimental Validation of Towed Underwater Cable Model

2019 ◽  
Author(s):  
Jan Vidar Grindheim ◽  
Antonio Carlos Fernandes ◽  
Joel Sena Sales Junior ◽  
Inge Revhaug
Keyword(s):  
Steady State ◽  
Experimental Validation ◽  
Experimental Results ◽  
Experimental Setup ◽  
Two Dimensional ◽  
Cable Model ◽  
Governing Equations ◽  
Current Channel ◽  
Steady State Condition ◽  
Wet Weight

Abstract Towed underwater cable models have been validated using experimental results performed in the current channel at Laboratório de Ondas e Correntes (LOC) at COPPE/UFRJ, Rio de Janeiro. The numerical simulators utilize a Finite Difference Method to solve the Partial Differential Equations describing the dynamics of a towed underwater cable under tension. A non-dimensional analysis of the system dynamics for the two-dimensional case has been performed, with non-dimensional governing equations being presented. The experimental setup consists of two cable sections of ∼1.5 m length each, the first having 3 mm diameter and slightly positive wet weight while the second section has 2.5 mm diameter and slight negative wet weight. With the cable in steady-state condition, the towpoint is moved 0.50 m sideways and the time for the cable to return to straight tow is measured. Further, the cable depths at midpoint and tail are measured in steady-state. Experiments are performed at currents ranging from 0.17 to 0.47 m/s. The presented experimental results are compared to the numerical results. Reasonable agreements are obtained.

Terahertz Spectroscopy of Two-Dimensional Semimetal in Three-Layer InAs/GaSb/InAs Quantum Well

JETP Letters ◽  
2019 ◽  
Vol 109 (2) ◽  
pp. 96-101 ◽  
Author(s):  
S. S. Krishtopenko ◽  
S. Ruffenach ◽  
F. Gonzalez-Posada ◽  
C. Consejo ◽  
W. Desrat ◽  
...  
Keyword(s):  
Quantum Well ◽  
Terahertz Spectroscopy ◽  
Two Dimensional
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