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Ultra-High Repetition Rate Terahertz Time-Domain Spectroscopy for Micrometer Layer Thickness Measurement
2021
Sensors
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Their main difference compared to fiber-laser-driven systems is their ultra-high repetition rate of typically dozens of GHz. ...
Terahertz time-domain spectroscopy systems driven by monolithic mode-locked laser diodes (MLLDs) exhibit bandwidths exceeding 1 THz and a peak dynamic range that can compete with other state-of-the-art ...
Because of this fundamental property, we call this approach ultra-high repetition rate (UHRR) THz-TDS [18] . ...
doi:10.3390/s21165389
pmid:34450830
pmcid:PMC8400559
fatcat:gal37p7nkrh5vopcs7frmrwnc4
Solid-state-biased coherent detection of ultra-broadband terahertz pulses
2017
Optica
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Eventually, this may pave the way for the use of high-repetition-rate ultrafast lasers and commercially available electronics for the coherent detection of ultrashort THz pulses. ...
thin layer of ultraviolet fused silica. ...
Nowadays, research labs and companies own a wide portfolio of THz-time domain spectroscopy (THz-TDS) systems, performing field-resolved experiments with bandwidths up to 7 THz [5] [6] [7] . ...
doi:10.1364/optica.4.001358
fatcat:7q4trkdycvhcpjik74imo77nku
Non-Contact, Non-Destructive Testing in Various Industrial Sectors with Terahertz Technology
2020
Sensors
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In this article, we survey various non-contact, non-destructive testing methods by way of terahertz (THz) spectroscopy and imaging designed for use in various industrial sectors. ...
Material characterization, thickness measurement, and defect/corrosion assessment are demonstrated through the examples presented. ...
Thickness measurements have been demonstrated with both TDS and CW systems. In a TDS setup, reflections from the layer interfaces are identified as peaks in the time domain. ...
doi:10.3390/s20030712
pmid:32012901
pmcid:PMC7039230
fatcat:ecss3eoxerdu7efmak7ihh2fiy
Terahertz Nanoantennas for Enhanced Spectroscopy
[chapter]
2017
Terahertz Spectroscopy - A Cutting Edge Technology
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Terahertz spectroscopy has great potential for sensing a wide range of elementary excitations. ...
In this chapter, we show how terahertz nanoantennas can overcome the current limitations of terahertz spectroscopy such as low sensitivity and low spatial resolution. ...
Then, a 5-nm-thick adhesion layer of titanium was prepared using electron beam evaporation, with a 0.3-Å/s deposition rate in a high vacuum chamber (base pressure 10 −7 mbar). ...
doi:10.5772/66349
fatcat:asekbnp3cndtdolei757jmvylu
Note: High sensitivity pulsed electron spin resonance spectroscopy with induction detection
2011
Review of Scientific Instruments
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Instrum. 83, 124701 (2012) GaP based terahertz time-domain spectrometer optimized for the 5-8 THz range Appl. Phys. ...
Lett. 101, 181101 (2012) On the performance enhancement of adaptive signal averaging: A means for improving the sensitivity and rate of data acquisition in magnetic resonance and other analytical measurements ...
Frequency: 13.736 GHz, repetition rate: 1000 Hz. Averaging time 8 s. ...
doi:10.1063/1.3611003
pmid:21806239
fatcat:ycmxwpfuk5c4tobwwpies4lhye
THz metamaterials and plasmonics using 2D materials & highly conductive transparent oxides
[article]
2018
arXiv
pre-print
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Driven by a myriad of potential applications such as communications, medical imaging, security, spectroscopy, and so on, terahertz (THz) technology has emerged as a rapidly growing technological field ...
Therefore, there is wide interest in the community in employing novel naturally-occurring materials, such as 2D materials, as well as in designing artificial metamaterial structures for THz applications ...
ACKNOWLEDGMENTS The authors thank David Schurig and Ajay Nahata for useful discussions. The authors acknowledge the support from the NSF MRSEC program at the University of Utah under grant # ...
arXiv:1801.00851v2
fatcat:5crtw2njoberrcj4pso4oz4d6q
Broadband Terahertz Light–Matter Interaction Enhancement for Precise Spectroscopy of Thin Films and Micro-Samples
2018
Photonics
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time-domain spectroscopy (TDS) [12, 13] experiments. ...
Finally, we demonstrate the validity of our approach by time-domain spectroscopy of samples of a few µL. for spectroscopy, especially for biological systems, since the energy of the photon in the THz range ...
The authors are grateful to Sergey Mitryukovskiy and Garrett Curley for careful proofreading. ...
doi:10.3390/photonics5020011
fatcat:dhtkak2mfzfndl5gj2nqojlogu
High Throughput Laser Process of Transparent Conducting Surfaces for Terahertz Bandpass Ultrathin Metamaterials
2019
Scientific Reports
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In this paper, we present a novel Laser-based Metamaterial Fabrication (LMF) process for high-throughput fabrication of transparent conducting surfaces on dielectric substrates such as glass, quartz and ...
Terahertz (THz) imaging has attracted much attention within the past decade as an emerging nondestructive evaluation technique. ...
The authors would also like to acknowledge University of Iowa Microfabrication Facility (UIMF) for providing the sputtering and evaporation facilities for deposition of ultra-thin Al and Cu films. ...
doi:10.1038/s41598-019-38949-1
pmid:30816138
pmcid:PMC6395646
fatcat:aypguh2rzndbrfr56c7zu3ykum
Studies of Terahertz Sources and Their Applications
[chapter]
2022
Intelligent Electronics and Circuits - Terahertz, IRS, and Beyond [Working Title]
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The contributed chapter discuss the applications of terahertz radiations and its generation mechanism through laser plasma interactions. ...
The methods of generation of terahertz radiations from plasma wake field acceleration, higher harmonic generation and the laser beat wave plasma frequency are reviewed. ...
Non damaging testing The penetration length of radiations are measured by THz time-domain spectroscopy. The safety and penetrable properties of THz waves are useful for nondestructive testing. ...
doi:10.5772/intechopen.101685
fatcat:lrwefmlbafhfredegfd5v24miu
Diffraction-limited ultrabroadband terahertz spectroscopy
2016
Scientific Reports
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The strong focusing of ultrabroadband THz radiation provided by our approach is essential for investigating single micrometer-scale objects such as graphene flakes or living cells, and besides for achieving ...
Applying this concept to a large-area photoconductive emitter, we demonstrate diffraction-limited ultra-broadband spectroscopy system up to 14.5 THz with a dynamic range of 10 3 . ...
Terahertz spectroscopy in the time-domain is widely used for fundamental investigations of condensed and biological matter as well as for a broad range of applications. ...
doi:10.1038/srep24811
pmid:27142959
pmcid:PMC4855139
fatcat:g3wqr7jhvbf5jjutypbhtz24ea
Terahertz Imaging Systems With Aperture Synthesis Techniques
2010
IEEE transactions on microwave theory and techniques
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Active multichannel measurement method is found to be promising for real-time applications among the various terahertz imaging techniques and is chosen as a basis for the imaging instruments presented ...
The described instruments employ a multichannel high-sensitivity heterodyne architecture and aperture filling techniques, with close to real-time image acquisition time. ...
The authors would like to thank OFS Fitel Denmark ApS for supplying us with the DCF fiber modules. ...
doi:10.1109/tmtt.2010.2050246
fatcat:wjjtshpp3respd7icskkdz72yy
Electrical scanning probe microscopy of electronic and photonic devices: connecting internal mechanisms with external measures
2016
Nanotechnology Reviews
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Electrical scanning probe microscopy (SPM) techniques have been developed and deployed to measure, with nanometric spatial resolution and high quantitative accuracy, the two-dimensional profiles of dopant ...
capacitance microscopy of non-volatile memory devices, scanning voltage microscopy of terahertz quantum cascade lasers, and scanning voltage microscopy of interband cascade lasers. ...
All parameters refer to pulsed operation at a repetition rate of 1 kHz and a pulse width of 250 ns for L-J-V measurements. ...
doi:10.1515/ntrev-2015-0035
fatcat:i4at47ryi5curlzixrjpm4pv7e
Terahertz-bandwidth characteristics of coplanar transmission lines on low permittivity substrates
1994
IEEE transactions on microwave theory and techniques
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In addition, for the coplanar waveguide structures, waveforms corresponding to the even and odd modes have been individually resolved in the time domain for lines fabricated on the GaAs and membrane substrates ...
Pulse-propagation characteristics for the coplanar lines on the low-permittivity substrates have been compared in both the time and frequency domains with the transmission behavior of lines on GaAs substrates ...
Smith of the Massachusetts Institute of Technology, Lincoln Laboratory for providing lowtemperature grown GaAs layers. ...
doi:10.1109/22.339773
fatcat:eqyhskelrbef7nsj7p4yg4s3za
Optoelectronic characterization of transmission lines and waveguides by terahertz time-domain spectroscopy
2000
IEEE Journal of Selected Topics in Quantum Electronics
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Starting with the early optoelectronic generation and detection of single-mode, subpicosecond electrical pulses on coplanar transmission lines, their complete characterization by THz time-domain spectroscopy ...
The importance of dielectric materials characterization is explained and illustrated by THz-TDS measurements of high substrates. ...
ACKNOWLEDGMENT It has been the author's pleasure to have worked with the following outstanding scientists for various lengths of time, while we developed and demonstrated the usefulness of the optoelectronic ...
doi:10.1109/2944.902161
fatcat:ceuf45tudrcmlcdfcnevikb4lu
Breakthroughs in Photonics 2009
2010
IEEE Photonics Journal
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Mutig for his assistance with this manuscript and J. A. Lott, S. A. Blokhin, G. Fiol, N. N. Ledentsov, and A. M. Nadtochiy for contributing to the work at TU Berlin. ...
Time-domain spectroscopy has become a standard tool for the generation and detection of singlecycle terahertz pulses, but in most cases, the pulse energy is quite low. ...
The pulse repetition rate still sets a limit on the signal-to-noise ratio for attosecond pump-probe measurements, and therefore, other streaking techniques have resulted in time-resolved measurements with ...
doi:10.1109/jphot.2010.2048944
fatcat:4wnfxni2qzcwnfatprdbmqvqfy
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