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Fiber Coupled Transceiver with 6.5 THz Bandwidth for Terahertz Time-Domain Spectroscopy in Reflection Geometry

Robert B. Kohlhaas, Lars Liebermeister, Steffen Breuer, Marcel Amberg, David de Felipe, Simon Nellen, Martin Schell, Björn Globisch
2020 Sensors  
We present a fiber coupled transceiver head for terahertz (THz) time-domain reflection measurements.  ...  A record THz bandwidth of 6.5 THz and a peak dynamic range of up to 75 dB are achieved. In addition, we present THz imaging in reflection geometry with a spatial resolution as good as 130 µm.  ...  For this antenna geometry, a bandwidth of 6.5 THz in combination with a normalized spectral power of 90 dB at 1 THz is achieved.  ... 
doi:10.3390/s20092616 pmid:32375349 fatcat:fcuqphq33fflfenwj35mgsjari

Roadmap of Terahertz Imaging 2021

Gintaras Valušis, Alvydas Lisauskas, Hui Yuan, Wojciech Knap, Hartmut G. Roskos
2021 Sensors  
In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems.  ...  A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs  ...  THz Terahertz THz TDS Terahertz Time-domain Spectroscopy 30.  ... 
doi:10.3390/s21124092 fatcat:7q3u6kfpcvhpvokh32f3it2fny

Microscopic theory and numerical simulation of quantum well solar cells

Urs Aeberhard, Bernd Witzigmann, Fritz Henneberger, Yasuhiko Arakawa, Marek Osinski
2010 Physics and Simulation of Optoelectronic Devices XVIII  
We will also present experimental evidence indicating anisotropic emission in devices with highly-strained QWs.  ...  Return to Contents Conference 7597: Physics and Simulation of Optoelectronic Devices XVIII the only loss mechanism in the cell.  ...  We report the efficiency of CM in bulk PbSe and PbS using (ultrafast) TeraHertz time-domain spectroscopy (THz-TDS).  ... 
doi:10.1117/12.845478 fatcat:vxfg7swg3bh7rixxoa6qyhhx2u

2021 Index IEEE Transactions on Microwave Theory and Techniques Vol. 69

2021 IEEE transactions on microwave theory and techniques  
The Author Index contains the primary entry for each item, listed under the first author's name.  ...  -that appeared in this periodical during 2021, and items from previous years that were commented upon or corrected in 2021.  ...  Low-Loss Polytetrafluoroethylene Hexagonal Porous Fiber for Terahertz Pulse Transmission in the 6G Mobile Communication Window.  ... 
doi:10.1109/tmtt.2022.3156771 fatcat:7iov55dzdnbprgd42epirpfaia

Spaceborne laser instruments for high-resolution mapping

Anthony W. Yu, Michael A. Krainak, David J. Harding, James B. Abshire, Xiaoli Sun, Susan Valett, John Cavanaugh, Luis Ramos-Izquierdo, W. Andrew Clarkson, Norman Hodgson, Ramesh K. Shori
2010 Solid State Lasers XIX: Technology and Devices  
Both polarization-maintaining (PM) fibers and non-PM fibers have been employed with non-PM fiber systems requiring polarization sensing and control.  ...  All resulting visible lasers are single-axial-frequency with FWHM bandwidths less than 200 kHz, and are spatially pure with M² values less than 1.05.  ...  By increasing the gain, the mode-locked pulses are made narrower in the time-domain, thereby increasing their bandwidth.  ... 
doi:10.1117/12.843191 fatcat:6ouzsdkdknh63ordfsktdz3lqq

Sixth International Workshop on Specialty Optical Fibers and Their Applications (WSOF 2019): Conference Digest

Liang Dong, John Ballato
2019 Sixth International Workshop on Specialty Optical Fibers and Their Applications (WSOF 2019)  
Acknowledgments This work was done in the framework of the 4F project ("French laser Fibers for Factories of the Future") funded by BPI France (PIA program).  ...  This system could be directly set up on the production line in order to check, in real time that the extrusion process is functioning properly.  ...  Figure 3 (a) shows the measured time-domain waveform in this experimental configuration, demonstrating that THz pulse passed through the porous tube.  ... 
doi:10.1117/12.2557110 fatcat:jtbftehuzrbi5lupddv547q24m

Photoconductive Terahertz Emitters and Detectors for the Operation with 1550 nm Pulsed Fiber Lasers

Björn Globisch, Koch, Martin (Prof. Dr.)
The motivation for this study is the development of cost-efficient, flexible and rapid THz time-domain-spectroscopy (TDS) systems for the application in growing fields like non-destructive testing (NDT  ...  In this thesis, photoconductive terahertz (THz) emitters and detectors suitable for the excitation with femtosecond laser pulses centered on 1550 nm are investigated.  ...  ACKNOWLEDGMENTS This work was funded by the German Ministry for Education and Research under grant 13N13388.  ... 
doi:10.17192/z2017.0466 fatcat:pzw4aqspuna6plul2si7mipesu

Fast Tunable Terahertz Absorber Based on a MEMS-driven Metamaterial

Mingkai Liu, Mohamad Susli, Dilusha Silva, Gino Putrino, Hemendra Kala, Shuting Fan, Michael Cole, Lorenzo Faraone, Vincent P. Wallace, Willie J. Padilla, David. A. Powell, Mariusz Martyniuk (+1 others)
2017 Conference on Lasers and Electro-Optics   unpublished
In this work we show that by imbuing extremely highly confined polaritons with orbital angular momentum it is possible to induce new electronic selection rules in a controllable fashion.  ...  We demonstrate an athermally synchronized distributed feedback laser cascaded with microring filters on a silicon photonic platform, with >10dB extinction ratio and a synchronized wavelength shift of 0.02  ...  We report extreme nonlinear carrier dynamics in highly n-doped InGaAs thin film using terahertz time-domain spectroscopy.  ... 
doi:10.1364/cleo_qels.2017.fm1g.5 fatcat:optnllbc4vhfffpv6agyokdjae

Wireless Terahertz Communications: Optoelectronic Devices and Signal Processing

Tobias Harter
Moreover, a THz communication system using an optoelectronic receiver and a photonic local oscillator is shown for the first time, and a new class of devices for THz transmitters and receivers is investigated  ...  which enables a monolithic co-integration of THz components with advanced silicon photonic circuits.  ...  causal in the time domain [172] .  ... 
doi:10.5445/ksp/1000128941 fatcat:i76kddjtffholch6yp2uyo3auq

ErAs:In(Al)GaAs photoconductors for 1550 nm-based Terahertz time domain spectroscopy systems

Uttam Nandi
ErAs:In(Al)GaAs photoconductors have proven to be outstanding devices for photonic terahertz (0.1 THz-10 THz) generation and detection.  ...  TDS measurements and emitted THz power proves that In(Al)GaAs with 0.8 ML ErAs precipitates is suitable for fabricating high-performance THz devices. THz characterization sho [...]  ...  For fiber-coupled, table-top systems with >6 THz bandwidth with 1000 time trace average (∼1 min), the results obtained are better or competitive than all the other material systems.  ... 
doi:10.26083/tuprints-00019407 fatcat:kkon3n74mngi3dwz7ll52wr4ke

Terahertz quantum-cascade lasers for spectroscopic applications

Benjamin Malte Röben, Technische Universität Berlin, Technische Universität Berlin, Holger T. Grahn
In contrast, a newly developed method to utilize QCLs as sources for THz Fourier transform spectrometers enables highly sensitive spectroscopy over a significantly larger bandwidth of at least 72 GHz with  ...  A QCL fabricated in this manner allows for spectroscopy at a maximal resolution in the MHz to kHz range, but its accessible bandwidth is usually limited to a few GHz.  ...  TDS: Commercially available THz time-domain spectrometer [14]. HR FTS: Figure 2 Figure 2 . 2 : 222 Illustrations of the most important active region designs for THz QCLs.  ... 
doi:10.14279/depositonce-7267 fatcat:6uysq53b25dmrjljzrn5d3623a

Tunable lasers on a polymer-based hybrid photonic integration platform [article]

David De Felipe Mesquida, Technische Universität Berlin, Technische Universität Berlin, Klaus Petermann
Many approaches have been investigated in literature in order to offer integrated solutions that allow both their miniaturization and their co-integration with other optical functionalities in photonic  ...  Semiconductor tunable lasers as miniaturized optical sources with the agility to operate at different wavelengths are key elements in a large variety of applications, ranging from telecom to sensing.  ...  The dual DBR PIC has also been used for the photonic generation of THz signals in a CW Terahertz spectroscopy system.  ... 
doi:10.14279/depositonce-10148 fatcat:2ucv5xv2lzdqbn7pdwwzxemtoi

Power pulsing of the CALICE tile hadron calorimeter

Mathias Reinecke
2016 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)  
In this talk I will describe the scientific aims of DUNE, focussing on the experimental challenges in constructing an operating very large liquid argon time projection chamber detectors.  ...  For example, we now know that neutrinos have a mass, providing clear evidence for physics beyond the our current understanding.  ...  Especially the Timepix3 detector, which is optimized for this mode, provides very complete information for every detected particle. Every pixel measures time and deposited energy.  ... 
doi:10.1109/nssmic.2016.8069748 fatcat:zjgd7dmfdbhntb4kfwdtrlejhi

Accurate characterisation of Resonant Tunnelling Diodes for high-frequency applications

Razvan Morariu
Recent scientific advancements regarding the generation and detection of terahertz (THz) radiation have led to a rapid increase in research interest in this frequency band in the context of its numerous  ...  Even though the unique capabilities of RTD devices have been experimentally proven in the realisation of compact NDR oscillators and detectors, with fundamental frequencies of about 2 THz, and high-sensitivity  ...  Jepsen, "Reflection terahertz time-domain imaging for analysis of an 18th century neoclassical easel painting," Applied Optics, vol. 54, no. 16, pp. 5123- 5129, 2015. [65] S.  ... 
doi:10.5525/gla.thesis.81966 fatcat:53lfa4ixendsdk25qrpmpjswei

Barium Titanate Photonic Crystal Electro-Optic Modulators for Telecommunication and Data Network Applications

Peter Girouard
2016 unpublished
spacing while larger bandwidths are obtained in thinner film devices with wider electrode gap spacing.  ...  These findings were supported by calculations of the film thickness dependent half-wave voltage and electro-optic bandwidth. In order to  ...  The procedure for coupling the fiber to the waveguide is detailed in Appendix B.  ... 
doi:10.21985/n29t0k fatcat:jdxst2a2dnabnh44cl46he5bne
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