Electronics

electronics1This Program offers research and education programs, focusing on various element technologies, design and analysis theories and systems technologies needed to create next-generation electronic systems. The areas covered by the program include materials, plasma, devices, circuits, microwaves, optical engineering, signal processing, communications and systems.
In this program, students will acquire advanced knowledge of electronics and information and communications technology, key technological fields of our time. The goal of this program is to nurture specialized engineers and researchers with sufficient knowledge, skills and integrated ability to lead the development of new technologies for the future and adapt the new technologies to social needs.
In the field of electronics, engineers and researchers must be familiar with, for example, the physical mechanisms of devices that perform different functions depending on the behaviors of electrons, the technology of transmitting information via microwave or optical fiber, and techniques to create systems from electronic circuits. To help students acquire a wide range of specialized knowledge and develop practical ability to make use of their knowledge, this program offers lectures and laboratory training, in which students are given opportunities to participate in cutting-edge research in small groups. The program is designed to train students to become professionals who are creative in their approach to problems.

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Laboratory Information

Digital and Analog Integrated Circuits laboratory Electromagnetic Wave Engineering laboratory
Conductor integrated circuits become more miniaturized and integrated four-fold every three years, and along with reductions in power consumption, these rapid improvements underpin the continuing miniaturization and enhanced function of electronic devices.
The smart phones and high-feature game consoles we now enjoy are only possible thanks to these integrated circuits. MOS transistors which are the core element in semi-conductor integrated circuits are now measured in nanometers.
In the Digital and Analog Integrated Circuits field, we model the characteristics of miniaturized transistors and research methods to handle the loss of reliability that occurs with such miniaturization.
More specifically we work on circuit-level design technologies and create simulation models for next-next generation transistors in an attempt to overcome such reliability issues as software errors, BTI (Bias Temperature Instability), RTN (Random Telegraph Noise) and so on.
From electromagnetic waves that reach us from the edges of the universe, to electromagnetic waves interacting with subtle periodic structures, in other words, from the dignified beauty of Maxwell’s equations to the short distance radio communications that revolutionized how people and things are connected, we conduct research and develop applications for electromagnetic phenomena, mainly in the telecommunications field.
Aiming to be scientists who can expand boundaries, and with our gaze fixed forwards in anticipation of our future society, we imagine paradigm shifts in telecommunications technology that will help us to live in harmony with the global environment, and that will also meet the needs of an ageing society with low birth rate. At the same time, we are constantly active trying to make better RF circuits and improving antennas so that the roads of tomorrow will be safer and more comfortable than today.
Our main areas of research include MHz-band near-body electric-field communications technology for ticket gates and health care applications, sub-GHz-band wireless communications technology for real-time control of power networks and agricultural sensor network applications, and furthermore, wearable RF circuits and antennas.
Applied Electromagnetics laboratory Optoelectronics and Optical Communication laboratory
Recent research into metamaterials- novel synthetic structures that can propagate electromagnetic waves- has progressed from microwaves and milliwaves to the terahertz range, and also into lightwaves.
Some well-known examples are negative refractive index lenses and the ability to make objects invisible (invisibility cloak). Some of the proposals coming from this laboratory so far are metamaterials with a positive refractive index when observing from the front and a negative refractive index from the rear, and artificial magnetic structures using dielectrics, and we are investigating the application of these ideas in antennas. For the future we are targeting the discovery of novel phenomena in electromagnetism and creation of devices with new functionality, which may have applications in wireless communications and electric power transfer.
Furthermore, we conduct theoretical analysis of wave motion dispersion from irregular surfaces and wave propagation within random media using the stochastic functional approach which can unify both the sample processes and the statistics. This theoretical analysis is vital as the foundational research for electromagnetic wave and optical imaging, remote sensing, and non-destructive testing.
Optical signals have an extremely wide frequency range so it will be possible to achieve communication speeds of several terabits. Optoelectronic technologies are also gaining attention in the search for ways to reduce system power consumption.
In this laboratory we conduct research with a view on the future optoelectronics industry, such as the development of optical devices using new functional materials, with research on photonic networks for higher internet speeds and communications systems with combinations of wireless and optical technologies.
In optical device research, we investigate light emitters and solar cells using organic materials as the active media, integrated optical waveguide elements from plastic materials, and other innovative optical communication devices.
In research on optical communication methods, we study optical signal processing and photonic networks, where optical signals are processed without converting them into electrical signals, and also to break free from the restricted wave frequency bands, we research the use of existing light sources in signaling devices for high-speed mobile communications using visible light wireless communications and radio-on-fiber communications.
Optical Engineering laboratory Optical Engineering laboratory
We are working towards the fusion of the electronic and optical technologies needed to realize the portable supercomputers of the future. More specifically, we conduct research and development on the underlying technologies for optical wiring for the high volume signal connections between super-high speed processors.
We currently work on proposals, design and development of manufacturing processes for the new optical elements and devices, as well as to verify the fundamental operations. Research is conducted together with the National Institute of Advanced Industrial Science and Technology in Japan, and we are also in discussions with key related corporations concerning the future direction for these technologies.
We are also progressing with research and development of light wave controlling elements and devices.
Specifically we are researching semiconductor laser oscillation control and sensor applications, as well as creating concepts for the new elements and systems needed, and developing the technologies required to manufacture, high-efficiency diffraction optical elements.
Images provide valuable information to humans, with some studies showing that over 90% of external information comes to us as visual information through our eyesight. “A picture is worth a thousand words” is the perfect expression for this. Recent times have seen a relentless and irreversible increase in the performance and functionality demanded of images, such as ever higher 2D image resolution and the transmission of moving images. Our group uses light’s physical advantages to conduct research into new visual technologies and systems, such as unprecedented 3D image display, 3D image measurement, and high-speed image recording and observation.
Electronics Device Engineering laboratory Solid-State Electronics laboratory
Through our research, we aim to create electronic devices and systems with new functions based on a variety of energy conversion principles. We do this using various combinations of functional and intelligent nanomaterials and silicon semiconductor based MEMSs (micro-electrical-mechanical systems).
We conduct research using liposomes- important artificial biological cellular model materials in bioengineering- to develop biosensors using new principles to detect the presence and dynamic behavior of proteins and other critical biomolecules, and also research concerning electronic devices and sensors that use oxide ferroelectric thin film materials, which have great potential for improved functionality and intelligence. Some examples of these devices are universal nonvolatile memory (for example, resistance random access memory, or ReRAM), capacitors with high-temperature operating ability, multiband tunable devices that can operate with microwaves and milliwaves (phase shifters, filters, etc.), high-sensitivity room temperature pyroelectric infrared sensors, ultrasonic sensors that can measure three-dimensional information in real time using superior piezoelectric substances, and touch and haptics sensors with multi-axis touch sensitivity and density greater than the human sense of touch.
In addition to performing microdevice design, production engineering, and development of measurement and sensing technologies, we provide wide ranging support in understanding the theories behind such areas as biomaterials, ferroelectric and piezoelectric materials, and MEMS technology, and help students of the graduate school create their own innovative electronic devices and systems.
We conduct education and research related to semiconductor devices and the underlying semiconductors materials. More specifically, we work in the following areas:
① Creation of semimetal-semiconductor alloys for new generation communication lasers with temperature independent oscillation wave length;
② Development of wafer bonding technology and its application in power transistors; and
③ Analysis and evaluation using emission spectrography of silicon semiconductors and devices.
Working with other research groups both within the school and externally, we simultaneously conduct seed research to propose new semiconductor and other materials, and needs-based research to find solutions to specific issues faced by industry, which helps our graduate students gain a broad perspective during their time at the school.
Solid-State Electronics Electronic Material Engineering laboratory
We perform research on nitride semiconductors, constructed of elements with low environmental impact and well known around the world for their use in blue LEDs, to find applications as a next generation solar cell material.
We add various metallic elements to the nitride semiconductors in a fresh attempt to design and engineer a band structure and develop high-efficiency solar cell materials, while also creating manufacturing processes with minimal environmental impact, with a joint aim of achieving a true low-carbon society.
Here at Electronic Material Engineering, we perform research and development into process and measurement engineering for the manufacture of electronic materials using low temperature plasma. We have recently been progressing with research on next generation electronic device and materials manufacture in an attempt to leverage plasma technology in nanotechnology.
Specifically, we are targeting the manufacture of carbon nanotubes and nanocarbon materials such as graphene, as well as working on their application in electronic devices, hydrogen tanks, capacitors and other energy devices, as well as in the medical field.
Furthermore, we aim to create with plasma processes the technologies that will be required for the development of information processing device, energy, environmental and medical applications of our future society. We do this by researching the foundational physics and applications of microparticle plasma, ultra-precision processing of high dielectric-constant gate insulator and electrode materials for next-generation integrated circuits, as well as the forming and sterilization of low dielectric-constant thin films which will be critical for the manufacture of ultra-high-speed arithmetic elements.
Plasma Science and Technology laboratory Energy and Instrumentation Engineering laboratory
We perform research and development on the following innovative energy technologies based on plasma science:
① Development of methods to increase torus plasma capability (extended confinement time, control spontaneous current, etc.) to realize reactor plasma with superior efficiency and economics in order to construct nuclear fusion reactors without needing to use superconducting coils;
② Development of enhanced control methods to understand and improve the capability of magnetohydrodynamic phenomena of helical plasma in the shape of a twisted doughnut, as well as high-speed plasma visual diagnosis methods.
These are the core areas of research required to realize new sources of energy.
We are also active in the following areas:
③ Use of non-neutral plasma, where the electroneutral conditions have been completely disrupted to create for the first time in the world a two-fluid plasma, and the investigation of its core physical characteristics and application in small-scale nuclear fusion energy sources;
④ Development of new types of nanotechnology for generating ion clusters using non-neutral plasma traps and their application in creating quantum dots for next generation compound semiconductors. This is academic research aiming at achieving an energy efficient society through applications for existing plasma technology in the space and chemical fields, as well as for applications in electronic device manufacturing processes.
We have a master program consisting of taking lectures and participation in laboratory seminars where students can learn not just about plasma science, but can also gain a broader understanding of cutting edge electronics study, while students also learn how to proceed with the most advanced research that responds to the needs of society as well as their own research.
Please refer to the home page for the laboratory details.
How to construct the most efficient renewable energy systems is going to be a critical factor in resolving the energy issues we face. We investigate more efficient generation methods and energy carriers as part of that challenge.
Our research is focused on plasma self-organization phenomena, and by detailed measurement and understanding of this phenomena, hope to use it for the development of new processes and energy technologies.
We investigate plasma self-organization by measuring auto-structuring and the formation process at various scales in various types of plasma.
More specifically, we are expanding the measurement methods developed for high temperature/high density plasma and non-neutral plasma to process plasma in an attempt to observe and improve our understanding of self-organization in process plasma. We hope to increase the efficiency and capability of the material synthesizing process by understanding and controlling what is occurring at the atomic, molecular, and collective motion levels, and by then using this knowledge to develop new processes that can lead to the synthesis of new materials.
Nano Structure Science laboratory Nano Structure Science laboratory
Nanotechnology is a leading technology for manufacturing in the 21st century, with ever increasing levels of research and development in this field. In the research and development of electronic devices as well, core research in nanoscale processing, device structure and property control is becoming more and more important to create devices with new functions that utilize semiconductor, magnetic and dielectric materials. We research miniature scale processes, such as electron beams and ion beams, as well as their evaluation technologies, with the aim of creating devices that use this kind of nanoscale structure to enable new functionality. All kinds of matter are constructed of and exhibit different characteristics (properties) due to the different types of atoms they are made from, and from the different arrangements of those atoms. It is critical to observe and control the arrangements of atoms at the nanometer scale to develop materials that utilize the different characteristics of matter for the benefit of our society, and this technology is the core of nanotechnology as we know it today. We utilize electron beams to research nano-structural analysis technologies.
The development of nanoscale evaluation technologies mainly occurs using electron microscopes, and the results of this development are then used for the development and application of new semiconductor, metallic, ceramic and polymer materials and devices.
Students of our laboratory acquire the core knowledge in nanostructure analysis through lectures, seminars, and special laboratory sessions.
Electronic Material Science laboratory Electronic Material Science laboratory
In this laboratory we work towards the development of new environmentally friendly materials, as well as developing a fundamental understanding of the material properties.
For example, we are working towards the development of the next-generation carbon based materials such as carbon nanotubes and graphene, as well as applications of these materials in electronic devices, and are progressing with detailed material property analysis by spectroscopic methods using a variety of laser sources.
In addition to the above, we are also working on research and development of fundamental evaluation of the properties of nitride semiconductor materials which can be used in blue and green light emitters, and also on oxide semiconductor materials which are expected to have applications in solar cells and flexible displays.
Electrons are particles with an inherent charge and spin, and when in a solid, display a variety of behaviors that provide a variety of properties.
Our main interest is the characteristics of the electron system quantum-mechanical waves that occur at scales observable essentially with the naked eye (macroscopic quantum effect), and this is where we focus our in-depth experimental research.
More specifically, for the research on oxide superconductors, we are working on the investigation and synthesis of new materials, are investigating compound structures that give rise to superconductivity, and also are working on the development of purpose-specific synthesis systems and new electronic and magnetic measurement systems.
We use a holistic approach encompassing foundational physics right through to cutting edge measurement technologies, with the aim of identifying new phenomena that will inspire new ideas and lead to breakthroughs in the big challenges facing future generations.
Advanced Functional Materials Design laboratory  
We use computational physical engineering approaches to conduct research on electronic materials and the properties of nano joint systems. We are investigating the properties of matter focusing only on the dynamic energy of the atomic nuclei and electrons that are the core elements of matter, and the interaction energy that occurs between these particles. This methodology is called first principle analysis. It does not use experimental data or parameters based on experience, and you can accurately describe stably structures, electronic state, magnetism and electrical conductance of materials and their joint systems within an approximation framework.
We specifically conduct our research targeting the design of new functional materials, analysis of experimental results and prediction of unknown properties, and we are currently focusing our research on spintronic and magnetic materials.
We also aim to gain a fundamental understanding of quantum mechanics and condensed matter physics based on theoretical design of functional materials.