NEWSLETTERof the International Consortium“Development of High-Power Terahertz
Science & Technology”
February 2017

№5

CONTENT

Editorial (Page 1)
How to contribute to the NewsletterNews from the members of the Consortium (Page 2)
New International Research Group at FIR UF.
Short paper (Page 3)
Dumbrajs O., “Generalized Self-Consistent Non-Stationary Theory of the
Gyrotron”
Presenting our collaborators (Page 6)
Institute of Solid-State Physics, University of Latvia
Announcements of scientific events (Page 7)
List of selected recent publications and patents (Page 16)
Selected news from the Net (Page 26)

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EDITORIAL: HOW TO CONTRIBUTE TO THE NEWSLETTER
Dear Reader,
We are inviting contributions to the following rubrics:
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Research highlights (annotations) presenting the projects pursued by the members of the Consortium.
Short regular papers.
Proposals for collaborative research work.
News from the participating institutions.
Information about conferences, symposia, workshops, seminars.
Programs and frameworks for an exchange of visits and mobility of researchers. Job opportunities(especially for young researchers, e.g. postdoctoral positions, specializations, internships).
Annotations of books, conference proceedings, software and internet resources. Additions to the list of therecent scientific publications and conference reports at the website of the Consortium (http://fir.ufukui.ac.jp/Website_Consortium/publist.html).
Information and announcements about awards and nominations.
Short presentations of laboratories and research groups belonging to the participating institutions.

Please submit your contributions to the Newsletter as well as requests for information to:Professor Toshitaka Idehara
Supervisor of International Cooperation
and Facilitator of the International
Consortium
FIR UFidehara@fir.u-fukui.ac.jp

Dr. Svilen Sabchevski
Editor of the website and the Newsletter
Institute of Electronics of the Bulgarian
Academy of Sciences (IE-BAS)sabch@ie.bas.bg

NEWS FROM THE MEMBERS OF THE CONSORTIUM
NEW INTERNATIONAL RESEARCH GROUP AT FIR UF
Recently, a new International Research Group has been established at the Faculty of Advanced
Researches and the Research Center for Development of Far-Infrared Region, University of Fukui (FIR
UF Center). In the beginning of December 2016, Professor Svilen Petrov Sabchevski, a Head of theLaboratory Plasma Physics and Engineering at the Institute of Electronics of the Bulgarian Academy of
Sciences (IE-BAS) joined the group as a Specially Appointed Professor. This group includes the following
researchers (pictured): Professor Toshitaka Idehara – Supervisor of the international collaboration and facilitator of theInternational Consortium Professor Svilen Petrov Sabchevski – Specially Appointed Professor
 Visiting Professors at FIR UF:
 Professor Olgierd Dumbrajs, University of Latvia (October – December 2016)
 Professor Michail Glyavin, Institute of Applied Physics, Russian Academy of Sciences (January 2017)
 Professor Alexei Kuleshov, O. Ya. Usikov Institute for Radiophysics and Electronics, National
Academy of Sciences of Ukraine (February-March 2017)
 Dr. Eduard Khutorian, O. Ya. Usikov Institute for Radiophysics and Electronics, National Academy of
Sciences of Ukraine (until December 2017)
 Dr. Ali Khumaeni.

MISSION Promote a broad and active international collaboration
 Strengthen the leading position of FIR UF as a managing organization and a facilitator of theInternational Consortium for Development of High-Power THz Science and Technology as well as inother current and prospective collaborations.

GOALS AND OBJECTIVES Development of novel advanced concepts and devices for high power science and technology.
 Accelerate the research leading to the development of novel high-performance radiation sources (subTHz and THz gyrotrons) for novel applications.

MEANS
 Theoretical, experimental and numerical studies of sub-THz and THz gyrotrons
 Computer Aided Design (CAD) of radiation sources and quasi-optical systems
 Application of the developed gyrotrons to novel fields of the fundamental research and the technologies

SHORT PAPER
Generalized Self-Consistent Non-Stationary Theory of the Gyrotron
Olgierd Dumbrajs
Institute of Solid State Physics, University of Latvia

For a long time, the gyrotron theory was developed assuming that the transit time of electrons throughthe interaction space Ttr  L / v z is much shorter than the cavity fill time  d . Correspondingly, it was
assumed that during this transit time the amplitude of microwave oscillations remains constant. In such acase the standard self-consistent nonstationary theory of the gyrotron can be used [1]





dp
2
 i   p  1 p  if  , 
d

(1)

2

2 f
f
1

i


f

I

pd
.
 2

2 0

(2)

First, for the given initial high frequency field distribution f ( ,0) Eq. (1) is solved and the electrontransverse momentum p ( ,0) is calculated. Next, Eq. (2) is solved and f ( , h ) is found, which is theninserted into Eq. (1). This process is repeated until the solution no longer depends on time.
If the condition Ttr   d does not hold, Eq. (1) should be modified and the generalized self-consistentnon-stationary theory of the gyrotron should be used [2]





(3)

2 f
f
I

i


f

pd .
 2

2 0

(4)

 2 p p2 i   p  1 p  if  , 
4  
2

Numerical implementation of solving the system (3) and (4) is significantly more complicated thansolving the system (1) and (2) [3].
It has been found that the theory free from the assumption about the frozen wave amplitude during theelectron transit time predicts some widening of the region of automodulation [4].
The topology of various regions (oscillations with constant amplitude, regular automodulation andchaos) shown in Fig. 1 is very similar to that presented in [5]. This could be expected because in the caseof stationary oscillations with constant amplitude the addition term with the partial time derivative in Eq.
(3) does not play any role. However, it plays a role in defining the boundary between the region of
stationary oscillations and the region of automodulation.
The boundaries between the regions of oscillations with constant amplitude and automodulation
determined with and without this additional term in Eq. (3) are shown in Fig. 2. Here, black, green and redlines show this boundary for the cases =0, =1.0 and =1.5, respectively. As the beam alpha increases,
so does the region of automodulation, mostly, in the region of large values of negative detunings.

Fig. 1. Zones of different kinds of oscillations are separated by solid lines. The normalized interaction
length =15 allows realizing the maximum orbital efficiency. The contours of constant orbital efficiencies
are shown by dashed lines. The point of the maximum orbital efficiency 0.7 is marked by the cross.

Fig. 2. Boundary between the regions of oscillations with constant amplitude and automodulation for threevalues of the beam alpha: =0 (black curve), =1.0 (green curve), and =1.5 (red curve). The first case(=0) represents results of the old theory in which the additional term in the equation for electron motion
was neglected. Dashed lines show the frequency shift of oscillations with respect to the cutoff frequency,
i.e. the frequency pulling.

The additional term in Eq. (3) may be important for the gyrotron development program at FIR UF
Center (University of Fukui, Japan). Let us mention three examples.
1) Competition between fundamental and higher harmonics.
The electron transit time through the resonator is the same for all harmonics, but the cavity decay time isdifferent. The condition Ttr   d holds better for higher harmonics than for the fundamental. To analyze
properly the mode competition one should use the system of equations (3) and (4) generalized tomultimode case.

2) Higher axial indices.
The condition Ttr   d holds better for lower axial indices. To analyze properly frequency tunability
based on excitation of modes with different axial indices one should use the system of equations (3) and(4).
3) Low-voltage gyrotrons (gyrotrino).
In the case of low-voltage gyrotrons the electron transit time through the resonator is long and thecondition Ttr   d may not hold.

References[1] N.A. Zavolsky, G.S. Nusinovich, and A.B. Pavelev, In: Gyrotrons (Academy of Sciences of USSR,
Gorky, 1989), p. 84 (in Russian).
[2] N.S. Ginzburg, A.S. Sergeev, I.V. Zotova, Phys. Plasmas, 22 (2015) 033101.
[3] O. Dumbrajs, H. Kalis, Phys. Plasmas, 22 (2015) 053113.
[4] O. Dumbrajs, G.S. Nusinovich, Phys. Plasmas 23 (2016) 083125.
[5] M.I. Airila, O. Dumbrajs, A. Reinfelds, U. Strautins, Phys. Plasmas, 8 (2001) 4608.
The author of this short paper, Professor Olgierd Dumbrajs was a Visiting Professor at the
University of Fukui and a member of the International Research Group at the Research Center for
Development of Far-Infrared Region (FIR UF) from October to December 2016. On 13 December
2016 he delivered a talk “Generalized self-consistent non-stationary theory of the gyrotron” at the
FIR UF seminar. The paper summarizes the main results presented and discussed there.

PRESENTING OUR MEMBERS

SPOTLIGHT ON THE INSTITUTE OF SOLID STATE
PHYSICS, UNIVERSITY OF LATVIAThe University of Latvia’s Institute of Solid State Physics (ISSP) is a member of the International
Consortium for Development of High-Power Terahertz Science and Technology and has active
collaborations with many research partners worldwide. The main research topics of the Institute are:Functional materials for electronics and photonics.
The R&D activities are focused on new materials for light emitters, sensors, materials for photonic
applications in information and communications technologies, technology development for synthesis andgrowth of large single crystals. Special attention will be given to prototyping of photonic andmicroelectronic devices based on the developed materials in close cooperation with Latvian SMEs.
Nanotechnology, nanocomposites and ceramics.
This broad research field covers novel nanomaterials and nanostructures, nanoceramics and polymer
nanocomposites, lead-free ferroelectric ceramic materials, materials for batteries, hydrogen production
and storage, as well as for thermoelectric devices. In particular, the research includes investigations ofdifferent nanowire based applications, studies of glass ceramics for numerous photonic applications,development of lead-free multiferroic materials, new sodium ion batteries and new materials andinnovative technologies for hydrogen energetics.
Thin films and coating technologies.
The main activities are directed towards R&D of the so-called Green Thin Film Nanotechnologies
based on such vacuum technologies as physical and chemical vapour deposition (PVD & CVD) andpulsed laser deposition (PLD) as well as organic and inorganic spray wet technologies. Development of
infrastructure, technological processes and a search for new applications in the field are also of higheconomical priority for Latvia, which has one of the largest vacuum technology industries among theBaltic countries.
Theoretical and experimental studies of materials structure and properties.
Development of existing and novel theoretical and experimental tools are of crucial importance forcharacterisation, testing and studying of (nano-)materials structural, electronic, magnetic and opticalproperties. These tools include high performance computing, x-ray absorption and optical spectroscopies,
scanning/electron/optical microscopy and methods for characterisation of structure.
The Institute of Solid State Physics (ISSP) is the EUROfusion partner representing Latvia’s fusion
research initiatives. The Latvian contribution to the European fusion programme began in 2000 in theform of cost-sharing actions and the Association EURATOM-University of Latvia was established in
2001. The ISSP is a member of the European Gyrotron Consortium (EGYC) (which consists of several
European Fusion Laboratories, namely KIT - Germany, CRPP - Switzerland, HELLAS - Greece, CNR Italy, and USTUTT- Germany), and and Thales Electron Devices (TED), France.
For more detail about Latvian R&D contribution to gyrotron development please visit:
http://www.cfi.lu.lv/projekti/eurofusion/

ANNONCEMENTS OF SCIENTIFIC EVENTSThe 6th International Workshop on Far-Infrared Technologies(IW-FIRT 2017) and The 2nd International Symposium on
Development of High Power Terahertz Science and Technology(DHP-TST 2017)(7-9 March 2017, University of Fukui, Fukui, Japan)
The International Workshops on Far-Infrared Technologies (IW-FIRT) has been held five times in the past:
1999, 2002, 2010, 2012 and 2014. In these workshops, it was aimed to discuss the recent development andfuture directions of far-infrared and terahertz science and technologies with a special emphasis on highpower radiation sources in this frequency region and their applications. On the other hand, the first
International Symposium on Development of High Power Terahertz Science and Technology (DHP-TST2013) was held in 2013 for discussion of the development of gyrotrons in sub-THz to THz band and theirapplications. This symposium was associated with the International Consortium "Promoting International
Collaboration for Development and Application of Submillimeter Wave Gyrotrons," which consisted of
six overseas institutions and three domestic institutions including FIR UF as the moderator institute. This
International Consortium was reorganized and expanded in 2015 to the new International Consortium for"Development of High-Power Terahertz Science and Technology” (Visit: http://fir.u-fukui.ac.jp/
Website_Consortium/), which consists of thirteen institutions from the world including FIR UF as thefacilitator institute. We feel that it is the time to organize IW-FIRT and DHP-TST as a joint meeting to
update our knowledge and understanding in this rapidly developing field. Therefore, we organize the Sixth
International Workshop on Far-Infrared Technologies (IW-FIRT 2017) and The 2nd International
Symposium on Development of High Power Terahertz Science and Technology (DHP-TST 2017) jointly,
rather than organize them separately. An important aspect of this joint meeting is to discuss the present
status and future prospect of application of high power terahertz technologies.
The joint workshop and symposium consist of invited talks, oral presentations, a panel discussion and aposter session with the following scope of topics:
1) Development of high power radiation sources in the far-infrared region,2) Application of high power terahertz technologies especially to the following topics:2-1) Terahertz spectroscopy;2-2) Magnetic resonance phenomena in the far-infrared region;2-3) Material development with high-power FIR sources.
3) Other subjects related to the far-infrared region.
For information about the past workshops of IW-FIRT and DHP-TS please follow the links:
5th IW-FIRT 2014, 4th IW-FIRT 2012, 3rd IW-FIRT 2010, and DHP-TST 2013
For more details please visit the official site of IW-FIRT 2017:
http://fir.u-fukui.ac.jp/IWFIRT/IWFIRT2017/index.html

The Program At-A-Glance (tentative)

Molecular Photoscience Research Center
International Symposium“Recent Advances in Terahertz Molecular Science”
March 10, 2017 Takigawa Memorial Hall, Kobe University
Scope:
This one-day symposium, a post-conference of IW-FIRT 2017/DHP-TST 2017 in the University of Fukui,
will be held on March 10, 2017, at Kobe University to discuss the recent progresses of the spectroscopic
applications of the THz region in molecular science. The THz region is an important frequency region to
explore structures, interactions, and dynamics of various molecular systems in the fields of chemistry,
biology, physics, and material science. The symposium provides an international forum for discussing
advances at the forefront of THz research in informal atmosphere.
Discussion topics:• THz ESR under strong magnetic field• Applications of THz spectroscopy to various molecular systems such as polymers•

and biological systems
Bioscience in magnetic resonance

Venue:
Takigawa Memorial Hall, Rokkodai 2nd campus, Kobe University

Invited speakers and tentative titles:
Mark Sherwin (UC Santa Barbara)
Joo-Hiuk Son (University of Seoul)"Terahertz molecular spectroscopy and its applications in cancer diagnosis"
Masayuki Hagiwara (Osaka University)
Kohji Yamamoto (University of Fukui)"Application of a metal parallel-plate waveguide to terahertz spectroscopy"
Keiichiro Shiraga (Kyoto University)"Characterization of hydration state and hydrogen-bond network in the biomolecular solutions and theepithelial cells"
Yoshihiko Kanemitsu (Kyoto University)"THz spectroscopy as a new characterization tool for solar-cell materials and devices"
Eiji Ohmichi (Kobe University)"Development of mechanically detected terahertz electron spin resonance technique"Toshiro Kohmoto (Kobe University)"Observation of ultrafast spin dynamics in antiferromagnetic transition metal oxides by pump-probe andterahertz spectroscopies"
Harumi Sato (Kobe University)"Higher-Order Structure of Biodegradable Polyesters Studied by Terahertz Spectroscopy"
Yasuhiro Kobori (Kobe University)"Electron Spin Polarization Imaging of Photoinduced Charge-Separated States in Photosynthetic
Proteins”
For more details, please visit: http://www.research.kobe-u.ac.jp/mprc/seminar/conference/RATHzMS/

10th International Workshop “Strong Microwaves andTerahertz Waves: Sources and Applications”
Nizhny Novgorod, Russia, July 17–22, 2017
This Workshop, organized by the Institute of Applied Physics of the Russian Academy in Sciences in
Nizhny Novgorod, Russia, will be held from July 17 to July 22, 2017 on board of a river boat startingfrom Nizhny Novgorod, Russia.

The Workshop will consist of four strongly interrelated topical symposia:
Symposium S: High power microwave sources;
Symposium H: Current drive and plasma heating by microwaves in nuclear fusion devices;
Symposium T: Extreme and nonlinear terahertz science (metamaterials for strong THz generation andfrequency conversion, nonlinear effects in THz frequencies, high power THz sources);
Symposium A: High power microwave and terahertz applications (including accelerators, radars, gas
discharges, materials processing, biomedical applications etc.)
This workshop is a continuation of the “Strong Microwaves in Plasmas” workshops held every three
years since 1990. The adjusted title reflects gradual changes in the workshop contents towards a
broader range of frequencies and applications. The scope of the workshop covers a wide circle ofresearch activities of both fundamental and applied importance. The workshop is highlyinterdisciplinary in nature; it opens ample opportunities for the interaction between the researchers
working in high-power microwave electronics and plasma physics, with strong emphasis on thedevelopment of diverse applications. A three-year cycle chosen for the workshop provides theparticipants with the possibility of accumulating significant results of their research.
For more detail visit the official website of the Workshop:
http://www.smp.sci-nnov.ru/
Please address all correspondence to the Scientific Secretary of the Workshop,
Dr. Sergey Mishakin
Institute of Applied Physics, RAS
46 Ulyanov St.,
Nizhny Novgorod 603950 Russia
Tel. +7 831 416 4621; Fax +7 831 416 0616
E-mail: smp@ipfran.ru

Overview
Terahertz (THz) science and technologies have rapidly advanced in recent years, attracting attention
owing to its wide array of applications in THz spectroscopy of materials, THz sensing, and nondestructive evaluation of industrial products. The Molecular Photoscience Research Center, Kobe
University and Research Center for Development of Far-Infrared Region, University of Fukui, have both
dedicated to the development of THz science and technology for more than ten years as Centers of
Excellence in this field. In the Philippine setting, pioneering THz-related research activities havecommenced in the University of the Philippines (Diliman and Los Banos), mainly in collaboration withthese Japanese institutes. These local THz research works have steadily grown and has expanded to active
research work at the De La Salle University.
As such, it is high time to formally announce and showcase this active collaborative link between thetwo countries by holding the 1st Philippines-Japan THz Workshop (PJTW 2017) Structure of theworkshop. This workshop aims to promote THz science and technology as a viable research area and toencourage young researchers and students to participate and present their works. The organizers hope that
this small workshop will further strengthen the ties between the THz research communities of Japan and
the Philippines.

Philippines-Japan THz Workshop 2017
De La Salle University Science and Technology Complex
Laguna Boulevard, LTI Spine Road, Barangays Biñan and Malamig, Biñan City, Laguna

Theme THz spectroscopy and sensing
 THz components (emitter, detector, waveguide, etc)
 THz material science (molecules, solid state materials, liquid meta-materials, nonlinear THz response,etc.) Theory and Modeling associated with THz science and technology
 Others, associated with THz science and technology
For more details please visit: http://www.dlsu.edu.ph/conferences/terahertz/2016/

LAPD18 Symposium is organized by Institute of Plasma Physics of the Czech Academy of Sciences. It
will take place in Hotel DUO in Prague, Czech Republic from Sunday, 24 September 2017 (evening) toThursday, 28 September 2017. The LAPD18 Symposium is the continuation of a biennial series thatbegan at Kyushu University in 1983. It brings together physicists and chemists in diverse areas of laserbased plasma diagnostics including the physics of nuclear fusion, laser physics and low-temperatureplasma chemistry and physics. The symposium aims to promote cross-pollination of these fields via
fruitful discussion, and covers all diagnostics using electromagnetic waves (lasers and microwaves)
applied to fusion plasmas, industrial process plasmas, environmental plasmas, plasmas for medical
applications, atmospheric plasmas, plasmas in liquids and other plasma applications. Topics on hardware
developments related to laser-aided plasma diagnostics are also welcome. Instrumentation developments
related to laser-aided plasma diagnostics also received emphasis in the program.
For more information visit: http://indico.ipp.cas.cz/event/5/

OTHER UPCOMING CONFERENCES
42st International Conference on Infrared, Millimeter and Terahertz Waves, will be held from August27-Sept. 1st in Cancun, Mexico.
http://www.irmmw-thz2017.org/

German THz Conference 2017
At the Ruhr University Bochum, Bochum, Germany from March 29 to 31, 2017.
http://www.thz2017.rub.de/IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling andOptimization for RF, Microwave, and Terahertz Applications, May 17-19, 2017 Pabellon de Mexico,
Sevilia, Spain.
http://www.nemo-ieee.org/
IEEE MTT-S International Microwave Bio Conference, May 15-17, 2017, Lindholmen ConferenceCentre, Goteborg, Sweden.
http://www.imbioc-ieee.org/
International Conference on Microwaves for Intelligent Mobility (ICMIM 2017), 19-21 March, Nagoya,
Aichi, Japan.
http://www.icmim-ieee.org/
Second International Conference on Terahertz Emission, Metamaterials and Nanophotonics(TeraMetaNano-2), May 28 – June 2, 2017, Palazzo Carnoldi, Venice, Italy
http://www.mifp.eu/SCHOOLS/TERAMETANANO-2/index.html
IEEE Wireless Power Transfer Conference (WPTC), Taipei, Taiwan, 10-12 May, 2017.
http://www.wptc2017.org/

ICMTT 2017: 19th International Conference on Microwave and Terahertz Technology, Bangkok, Thailand
August 30 - 31, 2017.
https://www.waset.org/conference/2017/08/bangkok/ICMTT
ICMTT 2018 : 20th International Conference on Microwave and Terahertz Technology, New York, USA
June 4 - 5, 2017.
https://www.waset.org/conference/2018/06/new-york/ICMTTICMST 2017 : 19th International Conference on Microwave Science and Technology, London, United
Kingdom, July 25 - 26, 2017https://www.waset.org/conference/2017/07/london/ICMST
27th International Conference “Microwave and Communication Technology”, 10-17 Sept 2017,
Ekaterinburg, Russia
http://agora.guru.ru/display.php?conf=CriMiCo_2016&page=conference&PHPSESSID=bdq7g5ikucaaeg
okhc5lvghuu6
Spring PIERS 2017 22-25 May 2017, St Petersburg, Russia.
http://www.piers.org/piers2017StPetersburg/files/callforpapers.pdf
Fall PIERS 2017(Progress in Electromagnetics Research Symposium), 19-22 November 2017, Singapore.
http://www.piers.org/piers2017Singapore/files/callforpapers.pdf
Eighteenth International Vacuum Electronics Conference, IVEC 2017, 24-26 Apr 2017, London, United
Kingdom
http://www.ivec2017.org/
44th IEEE International Conference on Plasma Science (ICOPS 2017), 21-25 May, 2017, Atlantic City,
New Jersey, United States of America (USA).
http://www.shu.edu/international-conference-plasma-science/index.cfm
SMOT 2017 (International Symposium on Microwave and Optical Technology) 26-28 Jun, 2017, Seoul,
Korea.
http://ismot2017.org/
16th International Conference on Microwave and High Frequency Heating 18-21 September 2017, Delft,
The Netherlands.
http://www.ampere2017.nl/Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 30 Jan - 2 Feb 2016,
San Francisco, California, USA.
http://spie.org/PWO/conferencedetails/thz-rf-mm-submm-wave-technology
20th International Summer School on Vacuum, Electron and Ion Technologies (VEIT 2017), 25-29 Sep
2017, Sozopol, Bulgaria.
http://www.veit.dir.bg/sozopol.htm

The 2017 IEEE International Conference on Antennas and Applications (IEEE CAMA 2017), 4-6 Dec
2017, Tsukuba, Ibaraki, Japan.
http://ewh.ieee.org/r10/tokyo/aps/CAMA2017/

LIST OF SELECTED RECENT PUBLICATIONS
Bibliography and links to selected recent publications on topics related to the research
field of the International ConsortiumThis is a cumulative list of selected publications in a chronological order as collected from various bibliographicaland alert services and published after October 2016, i.e. after issuing the previous Newsletter #4

A. Publications by authors from the institutions participating in the International Consortium
Idehara T., Hiromoto N., Sakai K., Tani M., Tominaga K., “Preface: Special Issue”Frontiers in THz
Technology II,” Journal of Infrared, Millimeter, and Terahertz Waves, vol. 37, n. 12 (2016) 1157–1157.
DOI:10.1007/s10762-016-0319-0.
http://link.springer.com/article/10.1007%2Fs10762-016-0319-0
Skalyga V.A., Izotov I.V., Mironov E.A., Voitovich A.V., Palashov O.V., “Design of permanent magnet
trap for high current gas dynamic ECR ion sources with plasma heating by gyrotron radiation withfrequency up to 45 GHz,” AIP Conference Proceedings, vol. 1771 (2016) 070014. DOI:10.1063/
1.4964238.
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4964238
Viktorov M.E., Shalashov A.G., Golubev S.V., Gospodchikov E.D., Mansfeld D.A., Vodopyanov A.V.,
Zaitsev V.V., “Kinetic instabilities in a mirror-confined plasma sustained by high-power microwave
radiation,” AIP Conference Proceedings, vol. 1771 (2016) 030005. DOI:10.1063/1.4964161.
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4964161
Koshelev M.A., Tsvetkov A.I., Morozkin M.V., Glyavin M.Yu., Tretyakov M.Yu., “Molecular Gas
Spectroscopy Using Radioacoustic Detection and High-Power Coherent Subterahertz Radiation Sources,”
Journal of Molecular Spectroscopy, vol. 331 (2016) 9-16. DOI:10.1016/j.jms.2016.10.014.
http://www.sciencedirect.com/science/article/pii/S0022285216302892
Ginzburg N.S., Rozental R.M., Sergeev A.S., Zotova I.V., Tarakanov V.P., “Chaotic millimeter wave
generation in a helical-waveguide gyro-TWT with delayed feedback,” Physics of Plasmas, vol. 23, n.10
(2016) 103106. DOI:10.1063/1.4964918.
http://scitation.aip.org/content/aip/journal/pop/23/10/10.1063/1.4964918
Vlasov S.N., Koposova E.V., "Diffraction Theory of Two-Mirror Echelette Resonators," Radiophysics andQuantum Electronics, vol. 59, n.4, (2016) 310–316. pp. DOI: 10.1007/s11141-016-9699-1.
http://link.springer.com/article/10.1007/s11141-016-9699-1
Fukunari M., Wongsuryrat N., Yamaguchi T., Komurasaki K., Koizumi H., “Design of a Millimeter-Wave
Concentrator for Beam Reception in High-Power Wireless Power Transfer", Journal of Infrared,
Millimeter, and Terahertz Waves", vol. 38, n. 2 (2016) 176–190. DOI: 10.1007/s10762-016-0327-0.
http://link.springer.com/article/10.1007/s10762-016-0327-0

Santos R.D., Ozawa S., Mag-usara V., Azuma S., Tuico A., Copa V., Salvador A., Yamamoto K., Somintac
A., Kurihara K., Kitahara H., Tani M., Estacio E., "Cherenkov-phase-matched nonlinear optical detection
and generation of terahertz radiation via GaAs with metal-coating," Opt. Express, vol. 24 (2016) 2498024988. DOI: 10.1364/OE.24.024980.
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-22-24980

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Sheng Yu, Qixiang Zhao, Tianzhong Zhang, Youwei Yang, Yanyan Zhang, Zhipeng Wang, “(Invited
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Shaping in a Low-Q Cavity," IEEE Trans. on Electron Devices, vol. 63, n. 10 (2016) 4081-4087.
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traveling-wave amplifiers operating at different frequency multiplications,” Physics of Plasmas, vol. 24, n.
1 (2017) 1070-664X. DOI: 10.1063/1.4974270.
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Smith D.R., Gowda V.R., Yurduseven O., Larouche S., Lipworth G., Urzhumov Y., Reynolds M., “Ananalysis of beamed wireless power transfer in the Fresnel zone using a dynamic, metasurface aperture,”
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C. PATENTS
Method and apparatus for exchanging communication signals
US 9461706 B1
Inventors: Robert Bennett, Paul Shala Henry, Farhad Barzegar, Irwin Gerszberg, Donald J Barnickel,
Thomas M. Willis
Publication date: Oct 4, 2016
https://www.google.com/patents/US9461706
Electron beam gun with kinematic coupling for high power RF vacuum devices
US 9502203 B1
Inventors: Philipp Borchard
Publication date: Nov 22, 2016
http://www.google.com/patents/US9502203
Large-Scale Space-Based Solar Power Station: Power Transmission Using Steerable Beams
United States Patent Application 20160380486
Inventors: Hajimiri S.A, Atwater H.A., Pellegrino S., Abiri B., Bohn F.
Publication date: Dec 29, 2016.
http://www.freepatentsonline.com/y2016/0380486.html
High power terahertz photoconductive antenna array

US 20160377803 A1
Inventors: Dong Ho Wu, Benjamin Graber
Publication date: Dec 29 2016
http://www.freepatentsonline.com/y2016/0377803.html
Method for the Chemical Strengthening of Glass
US 9505654
Inventors: Vladislav Sklyarevich, Mykhaylo Shevelev
Publication date: Nov 29, 2016
https://www.google.com/patents/US9505654

NEWS FROM THE NET (OUR BROADER HORIZONTS)
NEWS FROM MITNOVEL SOURCES OF COHERENT RADIATION USING METAMATERIALS AND INTENSEELECTRON BEAMS

Recently, Professor Richard Temkin and his colleagues at MIT have presented experimental results [1]that demonstrate the generation of reversed Cherenkov radiation when an intense electron beam is passing
through a waveguide loaded by a metamaterial. They have observed power levels up to 5 MW at afrequency of 2.40 GHz using a one microsecond electron beam of 490 keV in a magnetic field with anintensity of 400 G. The authors comment that contrary to the expectations the output power is not
generated in the Cherenkov mode but is due to a Cherenkov-cyclotron (or anomalous Doppler) instability
induced by the presence of the magnetic field, which is used for guiding the electron beam trough, thestructure. The resonance frequency is equal to the Cherenkov frequency minus the cyclotron frequency.
The potential applications of this first experimental demonstration of coherent microwave generation froma continuous electron beam interacting with a metamaterial structure are discussed in [2]. This work is acontinuation of the research of novel sources of coherent radiation that utilize metamateial structures andintense electron beams [3-4].
[1] J.S. Hummelt, X. Lu, H. Xu, I. Mastovsky, M.A. Shapiro, and R. J. Temkin, “Coherent CherenkovCyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide,” Phys. Rev. Lett., 117(2016) 237701. DOI: 10.1103/PhysRevLett.117.237701.
[2] M. Buchanan, “Focus: Better Microwaves from a Metamaterial”, Physics 9, 141 (December 2, 2016).
Visit: https://physics.aps.org/articles/v9/141[3] J.S. Hummelt, S.M. Lewis, M.A. Shapiro and R.J. Temkin, "Design of a Metamaterial-Based
Backward-Wave Oscillator," IEEE Trans. on Plasma Science, vol. 42, no. 4 (2014) 930-936.
DOI:10.1109/TPS.2014.2309597.
[4] J. Hummelt, Xueying Lu, Haoran Xu, M. Shapiro and R. Temkin, "High power microwave generationfrom a metamaterial waveguide," 2016 IEEE International Vacuum Electronics Conference (IVEC),
Monterey, CA, 2016, pp. 1-3. DOI: 10.1109/IVEC.2016.7561790.
The 2017 terahertz science and technology roadmap
Recently a large panel of researchers (from 32 institutions worldwide) has published a roadmap for afurther development of the terahertz science and technology (see the link below). Its aim is to present thecurrent State-of-the-Art in this broad field of research and to provide an opinion on the challenges andopportunities that the future holds. This topical review consists of 18 sections that cover most of the key
areas of THz science and technology. This paper and the references therein is a useful resource thatprovides a wide-ranging introduction to the capabilities of THz radiation and surveys the most important
well established as well as novel and prospective applications.
S.S. Dhillon et al., “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50(2017) 043001 (49pp). DOI:10.1088/1361-6463/50/4/043001.
Open Access:
http://iopscience.iop.org/article/10.1088/1361-6463/50/4/043001/pdf

The resonant heating of heavy water solutions under the terahertz pulse irradiation
In a recent paper by Yang, et al. significant differences between the properties of heavy and usual water
irradiated by terahertz pulses have been observed. The main highlights of this study are: (i) A resonant
heating of heavy water solution under terahertz pulse irradiation is observed; (ii) The resonant frequencies
exhibit a large difference between heavy water and normal water; (iii) Several rotational collective modes
are addressed as the mechanisms of the resonant phenomena; (iv) The specific location of the resonantpeak is dependent on the intensity of the terahertz pulse; (v) The shifting of peak location stems fromdifferent efficiency of each resonant mode under different pulse intensities.
For more detail see the paper:
Yang Rong-Yao, et al. “The resonant heating of heavy water solutions under the terahertz pulse
irradiation,” Journal of Molecular Liquids, vol. 229 (2017) 148–152. DOI: 10.1016/j.molliq.2016.12.064.
http://www.sciencedirect.com/science/article/pii/S0167732216325065
Record 34Gbit/second Wi-Fi data transmission at a 500 GHz range
Japanese researchers from Tokyo Institute of Technology have succeeded to boost the speed of Wi-Fi datatransmissions to 34 Gbps (Gigabits per second) by harnessing the 500 GHz frequency band of theelectromagnetic spectrum, which falls within the Terahertz range. Such high frequencies are attractive
because they have ultra-wide bandwidth (several tens of GHz) and offer short-range speeds of more than
100 Gbps. For more detail, please visit:
http://www.ispreview.co.uk/index.php/2016/12/terahertz-wifi-moves-closer-scientists-achieve-speeds34gbps.html
and the original paper:
Oshima N., Hashimoto K., Suzuki S., Asada M., “Wireless data transmission of 34 Gbit/s at a 500-GHz
range using resonant-tunnelling-diode terahertz oscillator,” Electronics Letters, vol. 52, n. 22 (2016)
1897-1898. DOI: 10.1049/el.2016.3120.
http://digital-library.theiet.org/content/journals/10.1049/el.2016.3120
First metal-free metamaterial that can absorb electromagnetic energy without heating
Electrical engineers at Duke University have created an electromagnetic metamaterial made without
metal. It has the ability of to absorb electromagnetic energy without heating. Such material could findnumerous applications in imaging, sensing, lighting and other advanced technologies. The concept of an
all-dielectric metasurface absorber offers a new route for control of the emission and absorption ofelectromagnetic radiation from surfaces with potential applications in energy harvesting, imaging, andsensing..
https://pratt.duke.edu/about/news/dielectric-metamaterial
See the original paper at:
Xinyu Liu, Kebin Fan, Ilya V. Shadrivov, and Willie J. Padilla, "Experimental realization of a terahertz
all-dielectric metasurface absorber," Opt. Express 25, 191-201 (2017). DOI: 10.1364/OE.25.000191.
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-1-191&origin=search
Terahertz radiation could speed up computer memory by 1000 times!

A team of Russian scientists from the Moscow Institute of Physics and Technology in a collaboration
with their colleagues from the Netherlands and Germany have developed a method for speeding up thecomputer memory using terahertz waves. For more detail, please see the original paper:
S. Bairel, et al., “Nonlinear spin control by terahertz-driven anisotropy fields,” Nature Photonics, 10,(2016) 715–718. DOI:10.1038/nphoton.2016.181.
http://www.nature.com/nphoton/journal/v10/n11/full/nphoton.2016.183.html