Sawada, Kazuaki

Japanese

Affiliation	Department of Electrical and Electronic Information Engineering
Concurrent post	Research Center for Agrotechnology and Biotechnology Research Center for Collaborative Area Risk Management (CARM) Institute for Research on Next-generation Semiconductor and Sensing Science (IRES²)
Title	Professor
Fields of Research	Integrated Circuits Devices/Semiconductor Devices
Degree	Dr. of Engineering (Toyohashi University of Technology)
Academic Societies	IEEJ / JSAP / ITE / IEICE / IEEE
E-mail	kazuaki.sawada@ Please append "tut.jp" to the end of the address above.
Laboratory website URL	http://int.ee.tut.ac.jp/bio/
Researcher information URL（researchmap）	Researcher information

Research

We have been conducting research on various types of smart sensors that integrate integrated circuit technology and sensor technology. These researches are based on the development of sensors with new principles for high sensitivity and high functionality, and aim at smart sensors that demonstrate the superiority of the sensors. In particular, we are conducting research related to "intelligent biochips" that integrate bio-related technologies and integrated circuit technologies.
1. Bio-image sensor using CCD technology
2. Fluorescence spectral image sensor that does not require optical filters
3. Smart microfluidic biosensor based on the fusion of MEMS and sensor technologies.
4. Multimodal sensors for agricultural and livestock applications

Theme1：Bio-image sensor that can visualizes the movement of ions

Overview

Diffusion of solutions with different pH and their optical images

Until now, the only devices that have existed in the world to measure ions have been those that measure them at a point, such as a pH meter. Until now, researchers in medical biotechnology and chemistry have conducted their research based on the "shape" of information obtained from optical and electron microscopes. However, these were only "shapes" and did not allow us to observe the reaction. We believe that if we can obtain chemical information such as ion distribution and its movement directly as image information, we can obtain a lot of new knowledge.

Selected publications and works

(1)Hideo Doi, Bijay Parajuli, Tomoko Horio, Eiji Shigetomi, Youichi Shinozaki, Toshihiko Noda, Kazuhiro Takahashi, Toshiaki Hattori, Schuichi Koizumi, and Kazuaki Sawada, Development of a label-free ATP image sensor for analyzing spatiotemporal patterns of ATP release from biological tissues, Sensors and Actuators: B. Chemical, Vol.335,129686, 2021
(2)You-Na Lee, Takeshi Araki, Yasuyuki Kimura, Fumihiro Dasai, Tatsuya Iwata, Kazuhiro Takahashi and Kazuaki Sawada, High-Density 2-μm-Pitch pH Image Sensor With High-Speed Operation up to 1933 fps, IEEE Transactions on Biomedical Circuits and Systems, Vol.13, Issue2, pp.352-363, 2019
(3)Kazuaki Sawada and Toshiaki Hattori, Ion image sensors and their application for visualization of neural activity, Japanese Journal of Applied Physics, Vol.57, No.10, 1002A2-1-11, 2018

Keywords

pH Sensor，Image Sensor，CCD，Multi-modal，Charge Transfer Type

Theme2：Multimodal sensors for agricultural and livestock applications

Overview

Multimodal Sensors

Recently, our group has developed the multimodal sensor, which is used for the several kinds of sensors like Electrical Conductivity sensor, pH sensor, and temperature sensor etc by LSI technology. The multimodal sensor is integrated to signal circuit, because the sensor is fabricated using Si-CMOS process
technology. It is possible to measure and obtained the details of miniaturization and complementary information by using the developed sensors. The major applications of this sensor are in agricultural fields and livestock industry. The industry needs the “Safety of Foods”, “Increase of Producing”, and
“Stable producing system climate or place independent” etc. Initially, the primary multimodal sensor is accomplished and experimented for soil of tomato for the application.

Selected publications and works

(1)Masato Futagawa, Makoto Takahashi, Keita Kamado, Makoto Ishida and Kazuaki Sawada, A pH Sensitivity Control Method Using Hydrogen Annealing for Reference Field-Effect Transistors, Sensors and Materials, Vol.25, No.9, pp.635-642, 2013
(2)Masato FUTAGAWA, MD. Iqramul HUSSAIN, Keita KAMADO, Fumihiro DASAI, Makoto ISHIDA, Kazuaki SAWADA, An Integrated Multimodal Sensor for the On-site Monitoring of the Water Content and Nutrient Concentration of SoilbyMeasuring the Phase and Electrical Conductivity, Sensors & Transducers Journal, Vol.14-1,Special Issue, pp.160-173, 2012

Keywords

Multimodal, Fusion, EC, pH, Plant factory

Theme3：Study of Micro Total Analysis Systems

Overview

Fluorescence is one of the most widely used information in the field of medical biotechnology today. A fluorescent label is immobilized on each biological material, and the presence or absence of fluorescence and the shape of the label provide a lot of information. In this study, we propose a new filter-free fluorescent sensor that utilizes the absorption characteristics of light in semiconductors to detect bioinformation such as DNA.Micro-TAS is a chemical analysis system that integrates microfluidic channel, pump, valve, and sensor on chip. It becomes possible for this system to measure more promptly than a conventional chemical analysis. The purpose of this study is application of medical care analysis. We fabricated Blood analysis chip. The microfluidic channel, photodiode and the signal processing circuit were integrated in this chip.

Selected publications and works

(1)Tomoya Ide , Yong-Joon Choi , Yasuyuki Kimura , Takeshi Hizawa , Kazuhiro Takahashi ,Hiromu Ishii , Toshihiko Noda , Kazuaki Sawada, Development of an on-chip microfluidic system with filter-free multiple-wavelength sensor for microflow cytometry, Sensors and Actuators: B. Chemical, Vol.350, 130896,2021
(2)Sawako Tanaka, Yong Joon Choi, Makoto Ishida, Kazuaki Sawada, Hiromu Ishii, Katsuyuki Machida, Yasuhiko Nikaido, Mitsumasa Saito, Shin-ichi Yoshida, Sensing Legionella by photogate-type fluorescence sensor Application toLegionella dumoffii, ELECTRONICS AND COMMUNICATIONS JAPAN, Vol.103, No.11-12, pp.83-89, 2020
(3)Sou Takahashi, Masato Futagawa, Tatsuya Iwata, Kazuhiro Takahashi, and Kazuaki Sawada, Highly sensitive glucose measurement using an amplified redox sensor, Japanese Journal of Applied Physics, Vol.59, No.4, 047002-1-6, 2020

Keywords

Micro-TAS，Microfluidic device，Integrated circuits, MEMS，

Title of class

Theory of logical circuit, Semiconductor engineering Ⅰ