The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Research Highlights
 Photonics research: Controlling photons with a photon
 Innovative photovoltaic materials: CsSn1-xPbxI3 nanocrystals as phase-stable perovskites
 Technology for visualizing flow of blood to aid neurosurgery in the human brain Computational intelligence-inspired clustering in Multi-access Vehicular Networks

Researcher Video Profiles
 Haruka Tanji-Suzuki, Associate Professor, Institute for Laser Science.
 Qing Shen, Professor, Graduate School of Informatics and Engineering.
 Kazuto Masamoto, Professor, Faculty of Informatics and Engineering.
 Celimuge Wu Associate Professor Graduate School of Informatics and Engineering.

Topics Theoretical aspects of cryptography: How do we know if the system is secure?
 Insights into quantum limits of materials: First observation of 100% valley-polarization in solids

News and Events
 Coherent Optical Science Seminar on Information Optics held at UEC, Tokyo
 UEC-ERATO Symposium on optical frequency combs and ultrashort pulse lasers
 The 33rd AWCC Seminar / IEEE Distinguished Microwave Lecture is held at UEC, Tokyo.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Photonics research: Controlling photons with a photon
Photons are considered to be ideal information carriers and expected to play important roles in quantum
communication and information processing, where quantum mechanics allows for absolutely secure
cryptographic key distribution as well as computation much faster than conventional computers. In order totake full advantage of quantum information carried by photons, it is important to make them directly interact
with each other for information processing.
However, photons generally do not interact with one another. So it is necessary to mediate such interactions
with matter to realize effective photon-photon interaction, but light-matter interaction is usually extremely
weak in normal media.
Haruka Tanji-Suzuki and colleagues at the Institute for Laser Science, the University ofElectro-Communications, Tokyo, are currently working to develop all-optical quantum devices that are
sensitive to a single photon input, such as a single photon switch in which an incoming photon switches thestate of another photon.
In order to realize the strong light-matter interaction that is necessary for such devices, Tanji-Suzuki uses alaser-cooled ensemble of 87Rb atoms (~10 uK) trapped within a high-finesse optical resonator (finesse~50000) in an ultrahigh-vacuum chamber. Notably, in order to switch a photon with a photon in such a system,
the researchers use an effect known as 'vacuum-induced transparency' observed recently by Tanji-Suzuki et al.,in which an electromagnetic field as weak as a vacuum field (light with no photons) is shown to alter the
optical properties of atoms.
"The realization of such all-optical single-photon devices will be a large step towards deterministic
multi-mode entanglement generation as well as high-fidelity photonic quantum gates that are crucial for
all-optical quantum information processing," says Tanji-Suzuki.

Vacuum chamber with high-finesse optical resonator and cold atoms.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Reference
・Authors: Haruka Tanji-Suzuki, Wenlan Chen, Renate Landig, Jonathan Simon,
Vladan Vuletic
・Title of original paper: Vacuum-Induced Transparency
・Journal, volume, pages and year: Science, 333, 1266-1269, 2011
・Digital Object Identifier (DOI): 0.1111/micc.12285
・Affiliations: Department of Physics, Harvard university; Department of Physics,
MIT-Harvard Center for Ultracold Atoms, and Research Laboratory ofElectronics, Massachusetts Institute of Technology
・Department website: http://kjk.office.uec.ac.jp/Profiles/55/0005461/prof_e.html
・Researcher Video Profiles:
http://www.ru.uec.ac.jp/e-bulletin/researcher-video-profiles/2018/haruka-tanji-suzuki.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Innovative photovoltaic materials: CsSn1-xPbxI3 nanocrystals as phase-stable
perovskites
CsSnI3 is a prototype inorganic halide perovskite that has recently been proposed as a strong candidate forphotovoltaic applications because of its unique properties as a semiconductor.
However, pure Sn perovskites are extremely unstable, quickly losing their single crystallinity and degrading
into inactive phases on exposure to air in less than five minutes.
Now, Qing Shen and colleagues at University of Electro-Communications, Tokyo, report that alloying CsSnI3
nanocrystals (NCs) with CsPbI3 significantly improves the phase stability of the Sn perovskites.
The alloyed CsSn1-xPbxI3 NCs (particle size 10~15 nm) were synthesized using a scalable hot-injection
method recently developed by Shen et al. where a mixture of SnI2 and PbI2 is dissolved in trioctylphosphineand rapidly injected into an octadecene solution containing Cs precursor at 120 to 170 °C. The reaction wasallowed to proceed for approximately 5 s, after which it was rapidly cooled to room temperature. The resulting
NCs were precipitated with methyl acetate and redispersed in hexane.
Notably, the resulting phases of the alloyed NCs can be stable for months, and far more superior to the parent
CsSnI3 (< 5 minutes).
The successful synthesis of these stable Sn/Pb perovskites opens up newopportunities to improve the stability of other amazing but susceptible
perovskite materials, and further expands their possibilities for practicalapplications.

Stable CsSn1-xPbxI3 perovskite
nanocrystals.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Reference
・Authors: Feng Liu, Chao Ding, Yaohong Zhang, Taichi Kamisaka,
Taro Toyoda, Teresa Ripolles-Sanchis, Shuzi Hayase, Takashi Minemoto,
Kenji Yoshino, Songyuan Dai, Masatoshi Yanagida, Hidenori Noguchi, andQing Shen.
・Title of original paper: Colloidal Synthesis of Air-Stable Alloyed CsSn1-xPbxI3
Perovskite Nanocrystals for Use in Solar Cells
・Journal, volume, pages and year: Journal of the American Chemical Society,
139, 16708 (2017).
・Digital Object Identifier (DOI): 10.1021/jacs.7b08628
・Affiliations: Faculty of Informatics and Engineering, The University ofElectro-Communications.
・Shen Lab website: http://www.shen.es.uec.ac.jp/index.htm
・Researcher Video Profiles:
http://www.ru.uec.ac.jp/e-bulletin/researcher-video-profiles/2018/qing-shen.ht
ml

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Technology for visualizing flow of blood to aid neurosurgery in the humanbrain
Neurosurgeons conduct vascular recanalization for treatment of cerebrovascular diseases. Successful surgery
necessitates surgery the minimization of flow disturbances due to blood during surgical intervention. However,monitoring the flow of blood under surgery is difficult due to a lack of imaging tools for visualizing
microcirculation in the brain.
Now, Kazuto Masamoto at the University of Electro-Communications, Tokyo, and colleague at National
Institute of Radiological Sciences in Japan have developed fluorescent imaging-based visualization tools forimaging and analyzing cerebral microcirculation.
The principle of the present method is to automatically calculate the distance for movements of fluorescent
tracers (e.g., indocyanine green) which were intravenously injected, from movies of the fluorescence. The
distance is divide by the rate acquired, resulting in an approximate of the velocity of the fluorescent tracers oneach pixel.
The researchers first confirmed the accuracy of their
method using phantom-tubes with known flow velocities
from the injection of fluorescent dyes that imitated themicrocirculation conditions of the body. Then, animalmodels were used to validate the methods.
"we successfully measured flow velocity in the brain
surface of anesthetized rats and mice," says Masamoto.
"We are starting collaborative works with medical
doctors to test the feasibility of our method for humanbrains under neurosurgery."A. Extracted vasculature of the mouse brain surface
by using a cross-correlation analysis of time-intensitychanges in fluorescent signals. B. Typical results formeasured time-intensity changes of pixel intensity
averaged over artery (red), vein (blue) and tissue(green) areas. C. A map of transit-time of fluorescentdyes on each pixel. D. Calculated blood flow velocity
map.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Reference
・Authors: Hoshikawa R, Kawaguchi H, Takuwa H, Ikoma Y, Tomita Y,
Unekawa M, Suzuki N, Kanno I, Masamoto K.
・Title of original paper: Dynamic Flow Velocity Mapping from Fluorescent Dye
Transit Times in the Brain Surface Microcirculation of Anesthetized Rats andMice.
・Journal, volume, pages and year: Microcirculation. 23(6):416-425. (2016)
・Digital Object Identifier (DOI): 0.1111/micc.12285
・Affiliations: Faculty of Informatics and Engineering, Brain Science Inspired
Life Support Research Center, University of Electro-Communications
・Department website: http://kjk.office.uec.ac.jp/Profiles/55/0005461/prof_e.html
・Researcher Video Profiles:
http://www.ru.uec.ac.jp/e-bulletin/researcher-video-profiles/2018/kazuto-masa
moto.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Computational intelligence-inspired clustering in Multi-access Vehicular
Networks
There is an increasing demand for distributing large amounts of digital information to vehicles on the move.
However, the current widely used cellular networks are not sufficient due to limited bandwidth in dense
vehicle environments. Recently, vehicular ad hoc networks (VANETs) have attracted great interest for
improving communications between vehicles using infrastructure-less wireless technologies. IEEE 802.11p isthe default standard for providing vehicle-to-vehicle (V2V) communications in VANETs.
However, there are two main technical obstacles for the integration of LTE with IEEE 802.11p. First, theselection of gateway nodes must take into account the overall network performance of the LTE as well as theV2V. Second, route creation from a vehicle to a gateway is challenging due to vehicle mobility and varying
node density. The vehicle mobility and inter-vehicle wireless link quality must be carefully considered for theselection of routes. For certain hours or road segments, vehicles are densely deployed, and therefore thenumber of concurrent sending nodes are huge. In IEEE 802.11p, the increase in the number of sending nodes
leads to performance degradation due to an exponential backoff based contention scheme at the MAC layer.
To resolve these issue, Celimuge Wu and colleagues at the University of Electro-Communications, Tokyo,
have proposed a two-level clustering approach where cluster head nodes in the first level try to reduce theMAC layer contentions for vehicle-to-vehicle (V2V) communications, and cluster head nodes in the second
level are responsible for providing a gateway functionality between V2V and LTE.
A fuzzy logic-based algorithm is employed in the first-levelclustering, and a Q-learning algorithm is used in thesecond-level clustering to tune the number of gateway nodes.
"Extensive simulation results under various Network
conditions show that the proposed protocol can achieve 23%
throughput improvement in high-density scenarios comparedto the existing approaches," says Wu.

Integration of LTE and IEEE 802.11p with clustering(the edge cluster head nodes are generated by the
first-level clustering, and the gateway cluster headnodes are generated by the second-level clustering).

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Reference
・[1] Celimuge Wu, Tsutomu Yoshinaga, Xianfu Chen, Lin Zhang, Yusheng Ji,"Cluster-Based Content Distribution Integrating LTE and IEEE 802.11p with
Fuzzy Logic and Q-Learning", IEEE Computational Intelligence Magazine,
Vol. 13, Issue 1, pp. 41-50, Feb. 2018.
・Website: http://comp.is.uec.ac.jp/wp/clmg-en
・Researcher Video Profiles:
http://www.ru.uec.ac.jp/e-bulletin/researcher-video-profiles/2018/celimuge-wu.
html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Haruka Tanji-Suzuki, Associate Professor, Institute for Laser Science.
Controlling photons with a photon using cold atoms in an optical resonator
Haruka Tanji-Suzuki is devising methods for controlling photons withphotons that are considered to be ideal information carriers in quantum
information science. In order to take full advantage of quantum
information carried by photons, it is important for them to directlyinteract with each other for information processing. But achieving thisis a challenge. "We are using matter to mediate interaction between
photons," says Tanji. "However, light-matter interaction is extremely weak in normal media. We confine
matter inside resonators to enhance light-matter interaction, which in turn allows strong photon-photon
interaction."
Tanji and her colleagues use laser-cooled atoms trapped inside an optical resonator. She wants to develop all
optical quantum devices that are sensitive to a single photon input, such as single photon switches, where
incoming photons switch the states of other photons.
"The realization of such all-optical single photon devices will be a major step towards all optical quantum
information processing that calls for advanced devices such as high-fidelity photonic quantum gates."
Further information
Haruka Tanji-Suzuki
Associate Professor, Institute for Laser Science, University of Electronic Communications, Tokyo.
Haruka Tanji-Suzuki website: http://www.ils.uec.ac.jp/~tanji/index-e.htm
Research Highlight:
http://www.ru.uec.ac.jp/e-bulletin/research-highlights/2018/photonics-research-controlling-photons-with-a-photon.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Qing Shen, Professor, Graduate School of Informatics and Engineering.
Perovskite semiconductor nanomaterials for next generation solar cells.
Qing Shen fabricates semiconductor nanomaterials and nanostructures
for next generation solar cells. "Research on inexpensive and highefficiency solar cells shows potential for solving problems related toenergy and the environment," says Shen. "In particular, perovskite
solar cells are attracting attention recently."
A high solar efficiency of over 20% has been reported by using a halogenated perovskite layer of several 100
nm thickness as the light absorbing layer of solar cells. This has attracted great attention. However,improvements in their durability and efficiency are major challenges.
Perovskite nanocrystals show potential for resolving these problems. This is because semiconductor
nanocrystals have unique properties compared with conventional bulk materials.
Recently, Shen has developed a unique method and succeeded in producing inorganic perovskite nanocrystals
with non-radiative transition free loss and 100% luminescence quantum yield. In addition, she also succeededin the preparation of very stable perovskite nanocrystals by this method.
When these nanocrystals were applied to solar cells, the energy conversion efficiency reached 11.3% and thedevices were stable even after more than two months.
Future research includes exploring the basic properties of these materials as well as applications to solar cells
and LEDs.
Further information
Qing Shen, Professor, Graduate School of Informatics and Engineering, University ofElectro-Communications, Tokyo.
Qing Shen laboratory: http://www.shen.es.uec.ac.jp/index.htm
Research Highlight:
http://www.ru.uec.ac.jp/e-bulletin/research-highlights/2018/innovative-photovoltaic-materials-cssn1-xpbxi3-nanocrystals-as-phase-stable-perovskites.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Kazuto Masamoto, Professor, Faculty of Informatics and Engineering.
Visualizing the flow of blood in the body
Kazuto Masamoto developing technology to visualize the flow ofblood in the brain. "We believe that if we can easily see the flow ofblood in the brain at home, then we will be able to prevent diseases ofthe brain," says Masamoto. "That key technology in the measurement
systems is the use of light."
Currently, it is necessary to use hospital facilities to measure blood flow in the brain of humans. So, at thisstage, Masamoto is conducting his research on visualizing the flow of blood using animal models. In addition
to blood flow imaging, he is also studying communication of blood with surrounding cells.
Recent achievements include the development of image analysis software to simultaneously visualize bloodflow by introducing pigments into blood vessels. Based on the preliminary results, he is working with brain
surgeons to investigate how his approach could be used during surgery.
Further information
Kazuto Masamoto, Professor, Faculty of Informatics and Engineering, University of Electro-Communications,Tokyo.
Research Highlight:
http://www.ru.uec.ac.jp/e-bulletin/research-highlights/2018/technology-for-visualizing-flow-of-blood-to-aid-n
eurosurgery-in-the-human-brain.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Celimuge Wu, Associate Professor Graduate School of Informatics andEngineering.
Multi-access Vehicular Networks"My research is mainly focusing on vehicular networks," says
Celimuge Wu. "Vehicular communication is very important for
supporting intelligent transport systems, autonomous driving, and othersuch infrastructure."
Wu's approach used computational intelligence to improve networking
performance, for example using fuzzy logic to improve the networking performance. "We have developed a
new kind of approach which integrates LTE with fuzzy logic and we have got significant improvement of
34% in a content distribution from the cloud to vehicles.
In the future, Wu and colleagues will consider using deep learning to support multiple traffics of wider
complex environments by using neural networks.
Further information
Celimuge Wu
Associate Professor
Graduate School of Informatics and Engineering, University of Electro-Communications, Tokyo
Celimuge Wu website: http://comp.is.uec.ac.jp/wp/clmg-en
Research Highlight:
http://www.ru.uec.ac.jp/e-bulletin/research-highlights/2018/computational-intelligence-inspired-clustering-inmulti-access-vehicular-networks.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Theoretical aspects of cryptography: How do we know if the system is secure?
Mitsugu Iwamoto, Associate professor, Department of Informatics, Graduate School of Informatics andEngineering, University of Electro-Communications, Tokyo.
Theoretical research on cryptography plays a central role in the development of information security because
only mathematical proofs can rigorously guarantee the accuracy of security models. Namely, how can we be
sure if the system is secure?
Most of security systems consist of several combinations of the basic building blocks (primitives) of
cryptography, such as symmetric-key cryptography, public-key cryptography, and authentication systems.
From a mathematical perspective, security of cryptographic primitives is classified into two paradigms:
computational security and information-theoretic security.
"Roughly speaking, under computational security, we assume that adversaries are computers (theoretically,
Turing machines), and we believe that the primitive is secure because it takes such as long time (e.g., morethan the age of universe!) in breaking the system by the computers," explains Iwamoto. "Computational
security is very nice trick, since it allows us to realize public-key cryptography which is one of the mostimportant inventions in the history of communications, but it becomes vulnerable if faster computation, e.g.,invention of quantum computers, are eventually available."
Information-theoretic security, on the other side, tries to guarantee the security against adversaries withunbounded computing power, that is, computational power is independent of the security. This requirement is
so severe that several important cryptographic primitives such as public-key cryptography are not available
under this setting. However, due to its strong requirement for security, information-theoretically secure
primitives are very important for protecting the data which must be kept secret very long time.
Iwamoto and colleagues are conducting research in many field including information-theoretic security. It isnotable that cryptography has been extensively studied since computationally secure cryptography such as
RSA (the first public-key cryptography) and DES (data encryption standard, the first standard ofsymmetric-key encryption adopted by NIST), was invented in late 70's.
In particular, the theory of cryptography has been developed along with the discussion of security notions,which suggest to us why and how we can say "the cryptosystem is secure". On the other hand, study of
security notions for information-theoretically secure cryptography has not been explored so deeply although it
was initiated by Shannon in 1950 far before the invention of computationally secure cryptography.
Recently, however, there is a much greater realization in the importance of information-theoretic security due
to needs for long-term security. Therefore, Iwamoto and colleagues investigated the information-theoretic
The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

security notions from the computational security viewpoint. The researchers have two main concerns: finding
the relationship among security notions of information-theoretically secure cryptography; and what would
happen by combining information-theoretically secure cryptosystems with other ones. These problems weretackled in the case of symmetric-key cryptography and key-agreement.
The research showed relationships among the information-theoretic security notions. "Technically, it isinteresting to find security gaps among the security notions called indistinguishability," says Iwamoto.
"Traditionally, computational cryptography requires indistinguishability of messages whereas
information-theoretic security requires no information leakage from ciphertexts. We captured both notions
from the viewpoint of indistinguishability, and we clarified that information-theoretic security notion requires
higher security than the indistinguishability in computational security notion, even if the adversary's
computing power is infinite."

Reference
・Authors: Mitsugu Iwamoto, Kazuo Ohta, and Junji Shikata

・Title of original paper: Security Formalizations and Their Relationships for Encryption and Key
Agreement in Information-Theoretic Cryptography
・Journal, volume, pages and year: IEEE Transactions on Information Theory, vol. 64,
issue 1 pp. 654-685(2018).
・Digital Object Identifier (DOI): DOI: 10.1109/TIT.2017.2744650
・Affiliations: Department of Informatics, Graduate School of Informatics and Engineering,
University of Electro-Communications
・Department website: https://www.uec.ac.jp/eng/education/ie_graduate/j/index.html

Associate Professor: Mitsugu, IWAMOTO (Ph. D. from The University of Tokyo 2004/03)
Current research areas: Information Security, Cryptography, Information Theory
Current research subjects: Information Theoretic Security
Personal website:
http://ohta-lab.jp/users/mitsugu/index-e.html
http://kjk.office.uec.ac.jp/Profiles/11/0001044/prof_e.html

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Insights into quantum limits of materials: First observation of 100%
valley-polarization in solids
Yuki Fuseya, Department of Engineering Science, University of Electro-Communications, Tokyo.
"A fundamental understanding of spin orbit coupling in crystals is a major area of research in modern solidstate physics," explains Yuki Fuseya. "Such knowledge plays a critical role in the development of devices
made using materials including topological insulators, and multilayers composites for spintronics andmultiferroics. I am looking at the transport properties of bismuth to shed light on spin orbit coupling in
crystals."Specifically, the quantum limit is the state of electrons under high magnetic fields, where the properties ofsolids are believed to be drastically changed due to quantum effects. However, it has been challenging to carryout precise measurements under high magnetic fields, so that, the properties of solids at the quantum limit stillrequire clarification.
With this background, Yuki Fuseya and colleagues at Wuhan National High Magnetic Field Center, China,
Los Alamos National Laboratory, USA, and Ecole Supérieure de Physique et de Chimie Industrielles, France,
discovered an unexpected sharp increase in the conductivity of bismuth. The researchers proved this to be the
100% valley-polarized state, which has not been achieved in any other solid placed under magnetic fields.
In their experiments, the researchers measured the transverse magnetoresistance for magnetic fields up to 65
Tesla (T) under rotating external magnetic fields maintained to be perpendicular to the direction of electric
current that was passed through the bismuth. The angular dependence of magnetoresistance obtained by thesemeasurements was compared with theoretical analysis based on the extended Dirac electron model.
According to the previous theorical reports, the conductivity of bismuth is believed to "decrease" rapidly at
the quantum limit. In contrast, the current measurements showed the conductivity to "increase" sharply atapproximately 50 T, and more detailed theoretical analysis showed this observation to be due to the fact that
one or two of the valleys become totally empty, that is, 100% valley-polarized state.
"This findings offer new possibilities ofcontrolling the degrees of freedom of valleys ofbismuth, and new innovations in the field of'valleytronics'."

Angle resolved magnetoresistance of bismuth.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Reference
・Authors: Zengwei Zhu, Jinhua Wang, Huakun Zuo, Benoît Fauqué, Ross D. McDonald, Yuki Fuseya, andKamran Behnia

・Title of original paper: Emptying Dirac valleys in bismuth using high magnetic field
・Journal, volume, pages and year: Nature Communications 8, 15297 (2017).
・Digital Object Identifier (DOI): DOI: 10.1038/ncomms15297
・Affiliations: Department of Engineering Science, University of Electro-Communications

Associate Professor: Yuki, FUSEYA (Dr. Sc. From Osaka University 2004/03)
Current research areas: Theoretical condensed matter physics, solid state physics
Current research subjects: Spin-orbit coupling in solids, quantum transport
Phenomena
Personal website: http://www.kookai.pc.uec.ac.jp/

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

Coherent Optical Science Seminar on Information Optics held at UEC, Tokyo
Coherent Optical Science Seminar on Information Optics was held on 21 May 2018 at the University ofElectro-Communications, Tokyo.
This event is part of the Coherent Optical Science Seminar series that are held to expand the university's
research activities in coherent optical science. Five seminars have been held during the past year, with four inEnglish.
After a welcome address by Yoko Miyamoto, associate professor at the Graduate School of Informatics andEngineering, the two speakers gave the following talks.
1. Vinu R. V., Utsunomiya University, Japan: "Polarization holography for imaging
applications"

The talk focused on the potential of polarization holographic techniques inimaging applications, with emphasis given to the newly developed Jones matrix
microscopy system.

Vinu R. V., Utsunomiya
University, Japan.

2. Maruthi Manoj Brundavanam, Indian Institute of Technology Kharagpur:"Topological transformation of fractional optical vortex beams using computer
generated holograms"

This talk described results on the spatial structures observed in optical beams
after the introduction of a vortex with fractional topological charge.

Maruthi Manoj Brundavanam,
Indian Institute of Technology
Kharagpur.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

UEC-ERATO Symposium on optical frequency combs and ultrashort pulse
lasersScott Diddams from NIST, USA and Seung-Woo Kim from KAIST,
Korea--two scientists renowned for their cutting edge research on opticalfrequency combs and ultrashort pulse lasers--were invited by Kaoru
Minoshima (Research Director of the JST, ERATO Minoshima Intelligent
Optical Synthesizer Project) and Masayuki Katsuragawa (Director of theInstitute for Advanced Science) to present their latest research findings at the

A scene of the symposium

UEC-ERATO Symposium, held on 23 April 2018 at UEC, Tokyo.
Scott Diddams has been involved in research on optical frequency combs fromthe early days, including many years of collaboration with Nobel Laureate John
Hall, a distinguished visiting professor at UEC, Tokyo. His talk was entitled,"Broad bandwidth synthesis and spectroscopy with laser frequency combs". He
presented his group's recent achievements on laser frequency combs that
extend spectral coverage from 350 nm to beyond 20,000 nm, with emphasis

Scott Diddams, NIST (USA)on generating mid-IR molecular fingerprint regions with brightness
comparable to infrared beam lines at synchrotron radiation facilities by using a simple and robust system.
Seung-Woo Kim is acknowledged for the development of the world's firstmode-locked fiber laser that successfully operated in space and for its
applications to precision mechanical engineering and measurement fromnano-scale to long distance. In his talk on, "Advanced optical metrology andfabrication using mode-locked lasers", he described many kinds of ultrashortpulse lasers and their applications, including absolute distance measurements,

Seung-Woo Kim, KAIST (Korea)

space missions, and 3D profile measurements for industry.
Approximately 70 people attended the symposium, including members of faculty and students from UEC,
Tokyo, as well as researchers from other institutes. These lectures on cutting edge research led to lively
discussions after the talks.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

The 33rd AWCC Seminar / IEEE Distinguished Microwave Lecture is held at
UEC, Tokyo.
The 33 AWCC (Advanced Wireless & Communication Research Center)
Seminar / IEEE Distinguished Microwave Lecture (IEEE DML) was heldon 28 May 2018 at the University of Electro-Communications, Tokyo.
AWCC seminars is held at UEC to strengthen research and engineering
on wireless communications. The 33rd AWCC seminar was organized inpartnership with IEEE DML that is produced by IEEE MTT-S

Patrick Robin (Ohio State Univ.)(Microwave Theory and Techniques Society) to support the activities of researchers studying high frequency
technology including micro, millimeter and terahertz waves.
The opening address by Ryo Ishikawa was followed by a speech from IEEE MTT-S by Masashi Nakatsugawa,
executive manager of NTT Advanced Technology Corp.
Patrick Robin, Ohio State University, described the measurement and design of high frequency active devices
in his talk titled, "Accelerated Design of Power amplifiers using an Embedding Device Model".
More than 50 participants including graduate students attended the seminar.

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585© 2018 The University of Electro-Communications.

The University of Electro-Communications (UEC) in Tokyo
is a small, luminous university at the forefront of pure and applied sciences, engineering, andtechnology research. Its roots go back to the Technical Institute for Wireless Commutations,which was established in 1918 by the Wireless Association to train so-called wireless engineers
in maritime communications in response to the Titanic disaster in 1912. In 1949, the UEC wasestablished as a national university by the Japanese Ministry of Education, and moved in 1957
from Meguro to its current Chofu campus Tokyo.
With approximately 4,000 students and 350 faculty, UEC is regarded as a small university, butwith particular expertise in wireless communications, laser science, robotics, informatics, andmaterial science, to name just a few areas of research.
The UEC was selected for the Ministry of Education, Culture, Sports, Science and Technology (MEXT)
Program for Promoting the Enhancement of Research Universities as a result of its strengths inthree main areas: optics and photonics research, where we are number one for the numberof joint publications with foreign researchers; wireless communications, which reflects ourroots; and materials-based research, particularly on fuel cells.
International Public Relations
The University of Electro-Communications
1-5-1 Chofugaoka, Chofu, Tokyo 182-8585
E-mail : kokusai-k@office.uec.ac.jp
Website : http://www.uec.ac.jp/eng/

The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo
182-8585 © 2018 The University of Electro-Communications.