Jun Ohta

Prof. Jun Ohta

Strategic Initiative for Research and Innovation, Nara Institute of Science and Technology, Nara, Japan
orcid

Research Focus & Metrics

Academic Career Length

40Years (1987-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 November 1994 in Nature
Verified
Journal Article
Closed access
KKKazuo Kyuma
Kazuo Kyuma
ELEberhard Lange
Eberhard Lange
Jun OhtaJun Ohta
Jun Ohta
AHAnno Hermanns
Anno Hermanns
BBBryan Banish
Bryan Banish
MOMasaya Oita
Masaya Oita

24 December 2002
Verified
Conference Paper
Closed access
WFW.T. Freeman
W.T. Freeman
KTK. Tanaka
K. Tanaka
Jun OhtaJun Ohta
Jun Ohta
KKK. Kyuma
K. Kyuma

17 November 2009 in Sensors
Verified
Journal Article
Open access
PDF file
Jun OhtaJun Ohta
Jun Ohta
TTTakashi Tokuda
Takashi Tokuda
Kiyotaka SasagawaKiyotaka Sasagawa
Kiyotaka Sasagawa
TNToshihiko Noda
Toshihiko Noda
The results of recent research on our implantable CMOS biomedical devices are reviewed. Topics include retinal prosthesis devices and deep-brain implantation devices for small animals. Fundamental device structures and characteristics as well as in vivo experiments are presented.

17 August 2018 in Biomedical Optics Express
Verified
Journal Article
Open access
PDF file
Kiyotaka SasagawaKiyotaka Sasagawa
Kiyotaka Sasagawa
AKAyaka Kimura
Ayaka Kimura
MHMakito Haruta
Makito Haruta
TNToshihiko Noda
Toshihiko Noda
TTTakashi Tokuda
Takashi Tokuda
Jun OhtaJun Ohta
Jun Ohta
We report a lens-free fluorescence imaging device using a composite filter composed of an interference filter and an absorption filter, each applied to one side of a fiber optic plate (FOP). The transmission of angled excitation light through the interference filter is absorbed by the absorption filter. The auto-fluorescence of the absorption filter is reduced by the reflection from the interference filter of normally incident excitation light. As a result, high-performance rejection of excitation light is achieved in a lens-free device. The FOP provides a flat, hard imaging device surface that does not degrade the spatial resolution. We demonstrate excitation rejection of approximately 108:1 at a wavelength of 450 nm in a fabricated lens-free device. The resolution of fluorescence imaging is approximately 12 µm. Time-lapse imaging of cells containing green fluorescent protein was performed in a 5-µm thin-film chamber. The small dimensions of the device allow observation of cell culturing in a CO2 incubator. We also demonstrate that the proposed lens-free filter is compatible with super-resolution bright-field imaging techniques. These features open a way to develop a high-performance, dual-mode, lens-free imaging device that is expected to be a powerful tool for many applications, such as imaging of labeled cells and point-of-care assay.

1 January 1991 in Neural Networks
Verified
Journal Article
Closed access
WBWolfgang Balzer
Wolfgang Balzer
MTMasanobu Takahashi
Masanobu Takahashi
Jun OhtaJun Ohta
Jun Ohta
KKKazuo Kyuma
Kazuo Kyuma

25 September 2009 in IEEE Transactions on Electron Devices
Verified
Journal Article
Closed access
TTTakashi Tokuda
Takashi Tokuda
KHKohei Hiyama
Kohei Hiyama
SSShigeki Sawamura
Shigeki Sawamura
Kiyotaka SasagawaKiyotaka Sasagawa
Kiyotaka Sasagawa
YTYasuo Terasawa
Yasuo Terasawa
Jun OhtaJun Ohta
Jun Ohta
We propose and characterize a CMOS LSI-based neural stimulator for retinal prosthesis technology. The stimulator is based upon a multichip architecture in which small-sized CMOS stimulators named ldquounit chipsrdquo are organized on a flexible substrate. We designed a unit chip with an on-chip stimulator and light-sensing circuitry. We verified that all the functions implemented on the unit chip worked correctly and that an organized unit chip can be used as a retinal stimulator with multisite image-based patterned stimulation. We also demonstrated light-controlled retinal stimulation for the first time in an in vivo animal experiment on a rabbit's retina.