Keishi Ohashi

上級研究員(研究院教授)

  • 1648 Citations
  • 20 h-Index
1979 …2017
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Research Output 1979 2017

  • 1648 Citations
  • 20 h-Index
  • 53 Article
  • 29 Conference contribution
  • 1 Chapter
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Article
2017
1 Citation (Scopus)

Review of Physiological Balance Sensing in an Unobtrusive Manner

Ohashi, K., Kuroiwa, S., Hideshima, S., Nakanishi, T. & Osaka, T., 2017 Sep 1, In : Electronics and Communications in Japan. 100, 9, p. 50-55 6 p.

Research output: Contribution to journalArticle

Biosensor
bioinstrumentation
Biosensors
Sensing
Immunoglobulin
2016

Review of physiological balance sensing in an unobtrusive manner

Ohashi, K., Kuroiwa, S., Hideshima, S., Nakanishi, T. & Osaka, T., 2016, In : IEEJ Transactions on Sensors and Micromachines. 136, 8, p. 357-361 5 p.

Research output: Contribution to journalArticle

Biosensors
Hormones
Field effect transistors
Monitoring
Communication
2013
11 Citations (Scopus)

A plastic-based bolometer array sensor using carbon nanotubes for low-cost infrared imaging devices

Narita, K., Kuribayashi, R., Altintas, E., Someya, H., Tsuda, K., Ohashi, K., Tabuchi, T., Okubo, S., Imazato, M. & Komatsubara, S., 2013, In : Sensors and Actuators, A: Physical. 195, p. 142-147 6 p.

Research output: Contribution to journalArticle

Bolometers
Carbon Nanotubes
Sensor arrays
Infrared imaging
bolometers
2011
5 Citations (Scopus)

InGaAs nano-photodiode enhanced using polarization-insensitive surface-plasmon antennas

Okamoto, D., Fujikata, J. & Ohashi, K., 2011 Dec, In : Japanese Journal of Applied Physics. 50, 12, 120201.

Research output: Contribution to journalArticle

Photodiodes
photodiodes
antennas
Polarization
Antennas
1 Citation (Scopus)

Introduction to the issue on photonic packaging and integration technologies

García-Blanco, S. M., Bakir, M. S., Matthews, K. I., Ohashi, K. & Horst, F., 2011 May, In : IEEE Journal on Selected Topics in Quantum Electronics. 17, 3, p. 495-497 3 p., 5749270.

Research output: Contribution to journalArticle

packaging
Photonics
Packaging
photonics
34 Citations (Scopus)

Vertical-coupling optical interface for on-chip optical interconnection

Yamada, H., Nozawa, M., Kinoshita, M. & Ohashi, K., 2011 Jan 17, In : Optics Express. 19, 2, p. 698-703 6 p.

Research output: Contribution to journalArticle

optical coupling
chips
optical fibers
gratings
misalignment
2010

ECS Transactions: Preface

Deen, M. J., Fang, Q., Jagadish, C. & Ohashi, K., 2010, In : Unknown Journal. 28, 14

Research output: Contribution to journalArticle

2009

Challenges and prospects for applications in the chips (LSI-Chip optical interconnection)

Kinoshita, M. & Ohashi, K., 2009 Aug, In : Journal of Japan Institute of Electronics Packaging. 12, 5, p. 452-457 6 p.

Research output: Contribution to journalArticle

Optical interconnects
3 Citations (Scopus)

Gigahertz-rate optical modulation on mach-zehnder plzt electro-optic modulators formed on silicon substrates by aerosol deposition

Shimizu, T., Nakada, M., Tsuda, H., Miyazaki, H., Akedo, J. & Ohashi, K., 2009, In : IEICE Electronics Express. 6, 23, p. 1669-1675 7 p.

Research output: Contribution to journalArticle

Light modulation
light modulation
Silicon
Electrooptical effects
Aerosols
4 Citations (Scopus)

Lanthanum-modified lead zirconate titanate electro-optic modulators fabricated using aerosol deposition for LSI interconnects

Nakada, M., Shimizu, T., Miyazaki, H., Tsuda, H., Akedo, J. & Ohashi, K., 2009, In : Japanese Journal of Applied Physics. 48, 9 Part 2

Research output: Contribution to journalArticle

large scale integration
Lanthanum
Electrooptical effects
lanthanum
Modulators
86 Citations (Scopus)

On-chip optical interconnect

Ohashi, K., Nishi, K., Shimizu, T., Nakada, M., Fujikata, J., Ushida, J., Toru, S., Nose, K., Mizuno, M., Yukawa, H., Kinoshita, M., Suzuki, N., Gomyo, A., Ishi, T., Okamoto, D., Furue, K., Ueno, T., Tsuchizawa, T., Watanabe, T., Yamada, K. & 2 others, Itabashi, S. I. & Akedo, J., 2009 Jul, In : Proceedings of the IEEE. 97, 7, p. 1186-1196 11 p., 5075754.

Research output: Contribution to journalArticle

Optical interconnects
LSI circuits
Photodiodes
Modulators
Operational amplifiers
2008
11 Citations (Scopus)

Low-loss silicon oxynitride waveguides and branches for the 850-nm-wavelength region

Tsuchizawa, T., Watanabe, T., Yamada, K., Fukuda, H., Itabashi, S., Fujikata, J., Gomyo, A., Ushida, J., Okamoto, D., Nishi, K. & Ohashi, K., 2008 Aug 22, In : Japanese Journal of Applied Physics. 47, 8 PART 2, p. 6739-6743 5 p.

Research output: Contribution to journalArticle

oxynitrides
Waveguides
waveguides
Silicon
Wavelength
22 Citations (Scopus)

LSI on-chip optical interconnection with Si nano-photonics

Fujikata, J., Nishi, K., Gomyo, A., Ushida, J., Ishi, T., Yukawa, H., Okamoto, D., Nakada, M., Shimizu, T., Kinoshita, M., Nose, K., Mizuno, M., Tsuchizawa, T., Watanabe, T., Yamada, K., Itabashi, S. & Ohashi, K., 2008 Feb, In : IEICE Transactions on Electronics. E91-C, 2, p. 131-137 7 p.

Research output: Contribution to journalArticle

Optical interconnects
Optical devices
Photonics
Clocks
Photonic devices
15 Citations (Scopus)

Numerical study of near-infrared photodetectors with surface-plasmon antenna for optical communication

Okamoto, D., Fujikata, J., Nishi, K. & Ohashi, K., 2008 Apr 25, In : Japanese Journal of Applied Physics. 47, 4 PART 2, p. 2921-2923 3 p.

Research output: Contribution to journalArticle

Optical communication
Photodetectors
photometers
optical communication
antennas
5 Citations (Scopus)

Optical properties of Pb(Zr,Ti)O3 films prepared by aerosol deposition

Tsuda, H., Nakada, M., Akedo, J. & Ohashi, K., 2008 May, In : IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 55, 5, p. 975-979 5 p., 4524970.

Research output: Contribution to journalArticle

Aerosols
aerosols
Optical properties
optical properties
Light absorption
22 Citations (Scopus)

Waveguide-integrated Si nano-photodiode with surface-plasmon antenna and its application to on-chip optical clock distribution

Fujikata, J., Nose, K., Ushida, J., Nishi, K., Kinoshita, M., Shimizu, T., Ueno, T., Okamoto, D., Gomyo, A., Mizuno, M., Tsuchizawa, T., Watanabe, T., Yamada, K., Itabashi, S. & Ohashi, K., 2008 Feb, In : Applied Physics Express. 1, 2, 022001.

Research output: Contribution to journalArticle

Photodiodes
clocks
photodiodes
Clocks
Waveguides
2007
20 Citations (Scopus)

Aerosol deposition on transparent electro-optic films for optical modulators

Nakada, M., Tsuda, H., Ohashi, K. & Akedo, J., 2007 Jan, In : IEICE Transactions on Electronics. E90-C, 1, p. 36-40 5 p.

Research output: Contribution to journalArticle

Light modulators
Electrooptical effects
Aerosols
Optical devices
Particles (particulate matter)
3 Citations (Scopus)

Application of electronic devices for aerosol deposition methods

Nakada, M., Kawakami, T., Iwanami, M. & Ohashi, K., 2007, In : NEC Technical Journal. 2, 1, p. 76-80 5 p.

Research output: Contribution to journalArticle

Aerosols
Piezoelectric devices
Optical devices
Oxides
Oxide films

Si nano-photonics innovate next generation network systems and LSI technologies

Nishi, K., Urino, Y. & Ohashi, K., 2007, In : NEC Technical Journal. 2, 1, p. 67-71 5 p.

Research output: Contribution to journalArticle

Next generation networks
Photonics
Nanophotonics
Optical devices
Electric power utilization
14 Citations (Scopus)

Ultra small electro-optic field probe fabricated by aerosol deposition

Iwanami, M., Nakada, M., Tsuda, H., Ohashi, K. & Akedo, J., 2007 Jan 25, In : IEICE Electronics Express. 4, 2, p. 26-32 7 p.

Research output: Contribution to journalArticle

Electrooptical effects
Aerosols
electro-optics
aerosols
large scale integration
4 Citations (Scopus)

Ultra small magneto-optic field probe fabricated by aerosol deposition

Iwanami, M., Nakada, M., Tsuda, H., Ohashi, K. & Akedo, J., 2007 Sep 10, In : IEICE Electronics Express. 4, 17, p. 542-548 7 p.

Research output: Contribution to journalArticle

Magnetooptical effects
magneto-optics
Aerosols
aerosols
probes
2006
72 Citations (Scopus)

Terahertz-wave near-field imaging with subwavelength resolution using surface-wave-assisted bow-tie aperture

Ishihara, K., Ohashi, K., Ikari, T., Minamide, H., Yokoyama, H., Shikata, J. I. & Ito, H., 2006, In : Applied Physics Letters. 89, 20, 201120.

Research output: Contribution to journalArticle

bows
surface waves
near fields
apertures
spatial resolution
2005
14 Citations (Scopus)
Ferroelectric films
Aerosols
aerosols
Permittivity
permittivity
21 Citations (Scopus)
Electrooptical effects
electro-optics
Aerosols
aerosols
Annealing
14 Citations (Scopus)

Excitonic molecule in a quantum dot: Photoluminescence lifetime of a single InAs GaAs quantum dot

Kono, S., Kirihara, A., Tomita, A., Nakamura, K., Fujikata, J., Ohashi, K., Saito, H. & Nishi, K., 2005 Oct 15, In : Physical Review B - Condensed Matter and Materials Physics. 72, 15, 155307.

Research output: Contribution to journalArticle

Excitons
Semiconductor quantum dots
Photoluminescence
quantum dots
excitons
23 Citations (Scopus)
Light transmission
apexes
gratings
polaritons
Throughput
28 Citations (Scopus)

Optical and electro-optical properties of Pb(Zr,Ti)O3 and (Pb,La)(Zr,Ti)O3 films prepared by aerosol deposition method

Nakada, M., Ohashi, K. & Akedo, J., 2005 Feb 15, In : Journal of Crystal Growth. 275, 1-2

Research output: Contribution to journalArticle

Aerosols
aerosols
Optical properties
optical properties
Transparency
291 Citations (Scopus)

Si nano-photodiode with a surface plasmon antenna

Ishi, T., Fujikata, J., Marita, K., Baba, T. & Ohashi, K., 2005, In : Japanese Journal of Applied Physics, Part 2: Letters. 44, 12-15

Research output: Contribution to journalArticle

Photodiodes
photodiodes
antennas
Antennas
Surface plasmon resonance
2 Citations (Scopus)
Surface structure
polaritons
excitation
Wavelength
causes
33 Citations (Scopus)

Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture

Ishihara, K., Ikari, T., Minamide, H., Shikata, J. I., Ohashi, K., Yokoyama, H. & Ito, H., 2005, In : Japanese Journal of Applied Physics, Part 2: Letters. 44, 28-32

Research output: Contribution to journalArticle

Terahertz waves
Plate metal
near fields
Diffraction
apertures
21 Citations (Scopus)

Terahertz wave enhanced transmission through a single subwavelength aperture with periodic surface structures

Ishihara, K., Hatakoshi, G. I., Ikari, T., Minamide, H., Ito, H. & Ohashi, K., 2005, In : Japanese Journal of Applied Physics, Part 2: Letters. 44, 28-32

Research output: Contribution to journalArticle

Terahertz waves
Surface structure
apertures
Bragg reflectors
Radiation
2004
8 Citations (Scopus)
Aerosols
aerosols
Optical properties
optical properties
Powders
2003
20 Citations (Scopus)

Electro-optical properties of (Pb, La)(Zr, Ti)O3 films prepared by aerosol deposition method

Nakada, M., Ohashi, K., Lebedev, M. & Akedo, J., 2003 Sep, In : Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 42, 9 B, p. 5960-5962 3 p.

Research output: Contribution to journalArticle

Aerosols
aerosols
Optical properties
optical properties
Opacity
171 Citations (Scopus)

Enhanced nonlinear optical conversion from a periodically nanostructured metal film

Nahata, A., Linke, R. A., Ishi, T. & Ohashi, K., 2003 Mar 15, In : Optics Letters. 28, 6, p. 423-425 3 p.

Research output: Contribution to journalArticle

metal films
apertures
harmonic generations
harmonic radiation
grooves
2002
15 Citations (Scopus)
Crystal structure
crystal structure
evaluation
grain size
Impurities

Nano-storage technology and electroplating, large magnetic moment of Co-Fe-Ni

Ohashi, K., 2002 Nov, In : Electrochemistry. 70, 11, p. 884-888 5 p.

Research output: Contribution to journalArticle

Electroplating
Magnetic moments
2001
16 Citations (Scopus)

Low resistance magnetic tunnel junctions and their interface structures

Fujikata, J., Ishi, T., Mori, S., Matsuda, K., Mori, K., Yokota, H., Hayashi, K., Nakada, M., Kamijo, A. & Ohashi, K., 2001 Jun 1, In : Journal of Applied Physics. 89, 11 II, p. 7558-7560 3 p.

Research output: Contribution to journalArticle

low resistance
tunnel junctions
oxidation
avoidance
products
1 Citation (Scopus)

Read/write characteristics of focused-ion-beam-etched heads for perpendicular magnetic recording media

Tsuboi, S., Matsutera, H., Ishi, T., Ishiwata, N. & Ohashi, K., 2001 Oct, In : Journal of Magnetism and Magnetic Materials. 235, 1-3, p. 375-381 7 p.

Research output: Contribution to journalArticle

Magnetic recording
Focused ion beams
magnetic recording
ion beams
Magnetic fields
12 Citations (Scopus)

Read performance of tunneling magnetoresistive heads

Ishihara, K., Nakada, M., Fukami, E., Nagahara, K., Honjo, H. & Ohashi, K., 2001 Jul, In : IEEE Transactions on Magnetics. 37, 4 I, p. 1687-1690 4 p.

Research output: Contribution to journalArticle

Shot noise
Vortex flow
Electric potential
shot noise
low noise
5 Citations (Scopus)

Structural and magnetic properties of high saturation induction CoNiFe electroplated films

Ohshima, N., Saito, M., Ohashi, K., Yamamoto, H. & Mibu, K., 2001 Jul, In : IEEE Transactions on Magnetics. 37, 4 I, p. 1767-1769 3 p.

Research output: Contribution to journalArticle

Structural properties
Magnetic properties
induction
magnetic properties
Magnetic moments
4 Citations (Scopus)

Thermal asperity of TMR heads for removable disk drives

Ohashi, K., Sato, A., Ishihara, K., Matsubara, T., Mitsuzuka, T., Tsuge, H. & Ishiwata, N., 2001 Jul, In : IEEE Transactions on Magnetics. 37, 4 I, p. 1919-1921 3 p.

Research output: Contribution to journalArticle

Bearings (structural)
gas bearings
Electric conductivity
spacing
electrical resistivity
2000
9 Citations (Scopus)

Co-Ni-Fe write heads with a 10-μm yoke length for high-speed recording

Nonaka, Y., Honjo, H., Toba, T., Saito, S., Ishi, T., Saito, M., Ishiwata, N. & Ohashi, K., 2000 Sep, In : IEEE Transactions on Magnetics. 36, 5 I, p. 2514-2516 3 p.

Research output: Contribution to journalArticle

Eddy currents
Coercive force
eddy currents
coercivity
recording
30 Citations (Scopus)

Low-resistance tunnel magnetoresistive head

Ohashi, K., Hayashi, K., Nagahara, K., Ishihara, K., Fukami, E., Fujikata, J., Mori, S., Nakada, M., Mitsuzuka, T., Matsuda, K., Mori, H., Kamijo, A. & Tsuge, H., 2000 Sep, In : IEEE Transactions on Magnetics. 36, 5 I, p. 2549-2553 5 p.

Research output: Contribution to journalArticle

low resistance
tunnels
Tunnels
Oxidation
oxidation

Ultra-high-density magnetic information storage technologies

Ohashi, K., Ishiwata, N., Yanagisawa, M., Sato, A., Tsuboi, S. & Hokkyo, H., 2000 Apr, In : NEC Research and Development. 41, 2, p. 160-165 6 p.

Research output: Contribution to journalArticle

Poles
Data storage equipment
Coercive force
Hot Temperature
1999
39 Citations (Scopus)

Corrosion properties of electroplated CoNiFe films

Saito, M., Yamada, K., Ohashi, K., Yasue, Y., Sogawa, Y. & Osaka, T., 1999 Aug, In : Journal of the Electrochemical Society. 146, 8, p. 2845-2848 4 p.

Research output: Contribution to journalArticle

corrosion
Saccharin
Corrosion
pitting
Pitting
58 Citations (Scopus)

Influence of crystalline structure and sulfur inclusion on corrosion properties of electrodeposited CoNiFe soft magnetic films

Osaka, T., Takai, M., Sogawa, Y., Momma, T., Ohashi, K., Saito, M. & Yamada, K., 1999 Jun, In : Journal of the Electrochemical Society. 146, 6, p. 2092-2096 5 p.

Research output: Contribution to journalArticle

Magnetic films
magnetic films
Sulfur
corrosion
sulfur
30 Citations (Scopus)

Write performance of heads with a 2.1-tesla conife pole

Ohashi, K., Morita, N., Tsuda, T. & Nonaka, Y., 1999, In : IEEE Transactions on Magnetics. 35, 5 PART 1, p. 2538-2540 3 p.

Research output: Contribution to journalArticle

Poles
poles
Coercive force
coercivity
induction
1998
1 Citation (Scopus)

An Advanced Magneto-Resistive Head with a Newly Developed Electroplated High-B s Write Pole

Gokan, H., Toki, K., Ohashi, K., Maruyama, T., Abe, M. & Mizuno, S., 1998 Jul, In : NEC Research and Development. 39, 3, p. 309-315 7 p.

Research output: Contribution to journalArticle

Poles
Bearings (structural)
Magnetic films
Exchange coupling
Magnetostriction
301 Citations (Scopus)

A soft magnetic CoNiFe film with high saturation magnetic flux density and low coercivity

Osaka, T., Takai, M., Hayashi, K., Ohashi, K., Saito, M. & Yamada, K., 1998 Apr 23, In : Nature. 392, 6678, p. 796-798 3 p.

Research output: Contribution to journalArticle

magnetic films
coercivity
magnetic flux
flux density
miniaturization
1994
1 Citation (Scopus)

Magnetization dynamics in thin film heads

Ohashi, K., 1994, In : Journal of Magnetism and Magnetic Materials. 134, 2-3, p. 262-267 6 p.

Research output: Contribution to journalArticle

Magnetization
Thin films
magnetization
Domain walls
Magnetic flux