Latest Publications

(91) K.Ozasa, J.Won, S.Song, T.Shinomura, M.Maeda,
Algal Res., 41 (2019) 101563.
"Phototaxis and photo-shock responses of Euglena gracilis under gravitaxis"

(92) S.Kato, K.Ozasa, M.Maeda, Y.Tanno, S.Tamaki, M.Higuchi-Takeuchi, K.Numata, Y.Kodama, M.Sato, K.Toyooka, T.Shinomura,
Plant J. (in press).
"Carotenoids are essential for light perception by the eyespot apparatus to initiate the phototactic movement of Euglena gracilis"

All Publications

(1) K.Ozasa, M.Yuri, S.Nishino, and H.Matsunami,
J.Cryst.Growth 89(4) (1988) 485-495.
"Low-Vacuum Metalorganic Vapor Phase Epitaxy of InGaP and its Immiscible Growth"

(2) K.Ozasa, M.Yuri, S.Nishino, and H.Matsunami,
J.Cryst.Growth 93(1-4) (1988) 177-181.
"Immiscible Growth of In1-xGaxP in Low-Vacuum MOVPE"

(3) K.Ozasa, M.Yuri, S.Tanaka, and H.Matsunami,
J.Cryst.Growth 95 (1989) 171-175.
"Growth Mechanism of In1-xGaxP and In1-xAlxP in Metalorganic Molecular Beam Epitaxy"

(4) K.Ozasa, M.Yuri, S.Tanaka, and H.Matsunami,
J.Appl.Phys. 65(7) (1989) 2711-2716.
"Metalorganic Molecular-Beam Epitaxy of InGaP"

(5) K.Ozasa, M.Yuri, and H.Matsunami,
J.Cryst.Growth 102(1-2) (1990) 31-42.
"Temperature Dependence of InGaP, InAlP, and AlGaP Growth in Metalorganic Molecular-Beam Epitaxy"

(6) K.Ozasa, M.Yuri, S.Tanaka, and H.Matsunami,
J.Appl.Phys. 68(1) (1990) 107-111.
"Effect of Misfit Strain on Physical Properties of InGaP grown by Metalorganic Molecular-Beam Epitaxy"

(7) M.Yoshimoto, K.Ozasa, and H.Matsunami,
J.Appl.Phys. 70(10) (1991) 5708-5709.
"Efficient Photo-Enhancement of GaP and AlGaP Growth in Chemical Beam Epitaxy"

(8) M.Yoshimoto, K.Ozasa, T.Tsuji, A.Kajimoto, and H.Matsunami,
J.Cryst.Growth 115(1-4) (1991) 265-268.
"MOMBE Growth of P-based III-V Semiconductors and its Photo-Enhancement at Low Temperatures"

(9) D.Kitriotis, K.Ozasa, T.Meguro, S.Shimoda, K.Nishi, and Y.Aoyagi,
Appl.Phys.Lett. 60(13) (1992) 1636-1638.
"Nanosecond Laser-driven Reflection High Energy Electron Diffraction System providing Digital Imaging in Real Time"

(10) J.P.Shimko, T.Meguro, S.Iwai, K.Ozasa, A.Hirata, Y.Aoyagi, and T.Sugano,
Jpn.J.Appl.Phys. 31(11A) (1992) L1518-L1521.
"Direct Observation of Self-Limiting Gallium Deposition on GaAs during Laser-Atomic Layer Epitaxial Processing"

(11) J.P.Shimko, T.Meguro, S.Iwai, K.Ozasa, Y.Aoyagi, and T.Sugano,
Thin Solid Films 225(1-2) (1993) 40-46.
"Surface photoabsorption study of the laser-assisted atomic layer epitaxial-growth process of GaAs"

(12) K.Ozasa, T.Ye, and Y.Aoyagi,
Jpn.J.Appl.Phys. 32(3A) (1993) L329-L331.
"Thin Gallium Oxide Film Deposited in Vacuum for In Situ Process Use"

(13) K.Ozasa, T.Ye, and Y.Aoyagi,
Appl.Phys.Lett. 63(12) (1993) 1634-1636.
"Selective Epitaxy of GaAs on Indium Oxide Mask followed by In Situ Removal of the Mask"

(14) K.Ozasa, T.Ye, and Y.Aoyagi,
Jpn.J.Appl.Phys. 32(10) (1993) 4732-4736.
"Composition Change of Indium Oxide Film by Triethylgallium Irradiation Prepared for In Situ Selective Epitaxy Use"

(15) K.Ozasa, T.Ye, and Y.Aoyagi,
J.Vac.Sci.Technol.A 12(1) (1994) 120-124.
"Deposition of Gallium Oxide and Indium Oxide on GaAs for In Situ Process Use by Alternate Supply of TEGa, TMIn and H2O2 as Surge Pulses"

(16) K.Ozasa, T.Ye, and Y.Aoyagi,
Thin Solid Films. 246(1-2) (1994) 58-64.
"Deposition of Thin Indium Oxide Film and its Application to Selective Epitaxy for In Situ Processing"

(17) K.Ozasa and Y.Aoyagi,
Appl.Phys.Lett. 64(17) (1994) 2220-2222.
"Generation of high-peak pulse beam of hydrogen plasma for the use in short-pulsed chemical beam epitaxy"

(18) K.Ozasa, E.K.Kim, and Y.Aoyagi,
Appl.Phys.Lett. 65(13) (1994) 1635-1637.
"In situ pattern deposition of In2O3 and in situ pattern etching of GaAs"

(19) K.Ozasa and Y.Aoyagi,
Surf.Coat.Technol. 74 (1995) 345-350.
"Temporal evolution of hydrogen plasma produced with gas pulse injection scheme"

(20) E.K.Kim, S.K.Min, K.Ozasa, and Y.Aoyagi,
Semicond.Sci.Technol. 10 (1995) 91-94.
"In-situ pattern etching of GaAs by trimethylindium and H2O2 gases with electron-beam-induced resist"

(21) Y.J.Park, K.Ozasa, P.O'Keeffe, Y.Aoyagi, S.K.Min,
J.Vac.Sci.Technol.A 14(5) (1996) 2814-2819.
"Transient characteristics of nitrogen gas-pulsed electron cyclotron resonance plasma"

(22) Y.J.Park, P.O'Keeffe, K.Ozasa, H.Mutoh, Y.Aoyagi, S.K.Min,
J.Appl.Phys. 81(5) (1997) 2114-2118.
"Oxygen atomic flux O* enhancement by gas-pulsed electron cyclotron resonance plasma"

(23) K.Ozasa, Y.Aoyagi, Y.J.Park, and L.Samuelson,
Appl.Phys.Lett. 71(6) (1997) 797-799.
"Reversible transition between InGaAs dot structure and InGaAsP flat surface"

(24) K.Ozasa
Adv.Coll.Interf.Sci. 71-72 (1997) 3-29.
"Selective Epitaxy with in situ mask processing and pulse plasma"

(25) K.Ozasa and Y.Aoyagi,
Microelectron.Eng. 43-44 (1998) 3-10.
"Surface structure change between InGaAs dots and InGaAsP flat surface induced by in situ arsenic/phosphorus replacement"

(26) K.Ozasa and Y.Aoyagi,
J.Cryst.Growth 188 (1998) 370-376.
"In situ composition control of self-organized InGaAs dots"

(27) K.Ozasa and Y.Aoyagi,
J.Electron.Mater. 28(5) (1999) 437-441.
"In situ control of strain-induced dot structure by arsenic/phosphorus replacement"

(28) K.Ozasa, S.Nomura, M.Takeuchi, and Y.Aoyagi,
Mater.Sci.Eng. B, 86(1) (2001) 34-40.
"Photoluminescence of InGaAs(P) dots with quasi-zero-dimensional confinement"

(29) H.Kurata, H.Kumagai, and K.Ozasa,
J. Electron Microsc. 50(3) (2001) 141-146.
"High-resolution elemental mapping of titanium oxide/aluminium oxide multilayer by spectrum-imaging"

(30) K.Ozasa, S.Nomura, and Y.Aoyagi,
Superlatt.Microstruct. 30(4) (2001) 169-179.
"Pressure effects on nanoprobe photoluminescence of quasi-zero-dimensional confinement quantum dots"

(31) K.Ozasa and Y.Aoyagi,
Physica E, 13(2-4) (2002) 212-215.
"Nanoprobe photoluminescence of quasi-zero-dimensional InGaAsP quantum dots"

(32) K.Ozasa, Y.Aoyagi, and M.Iwaki,
J.Mater.Sci.Lett., 22 (2003) 273-277.
"Multi-azimuth 360o observation of quantum nanostructures by scanning transmission electron microscopy"

(33) K.Ozasa, Y.Aoyagi, M.Iwaki, and H.Kurata,
J.Appl.Phys., 94(1) (2003) 313-317.
"Facets, indium distribution, and lattice distortion of InGaAs/GaAs quantum dots observed by three dimensional scanning transmission electron microscope"

(34) M.Ishii, K.Ozasa, and Y.Aoyagi,
Microelctro.Eng., 67-68 (2003) 955-962.
"Selective X-ray absorption spectroscopy of self-assembled atom in InAs quantum dot"

(35) K.Ozasa, Y.Aoyagi, A.Yamane, Y.Arai,
Appl.Phys.Lett. 83(11) (2003) 2247-2249.
"Enhancement of photoluminescence of InGaAs/GaAs quantum dots induced by nanoprobe pressure effects"

(36) K.Ozasa, Y.Aoyagi, M.Hara, M.Maeda, A.Yamane, and Y.Arai,
Physica E, 21(2-4) (2004) 265-269.
"Enhanced photoluminescence of InGaAs quantum dots induced by nanoprobe indentation"

(37) K.Ozasa, Y.Aoyagi, M.Iwaki, M.Hara, and M.Maeda,
Ultramicrosc. 101 (2004) 55-61.
"Nanofabrication of cylindrical STEM specimen of InGaAs/GaAs quantum dots for 3D-STEM observation"

(38) K.Ozasa, M.Maeda, and M.Hara,
Microelectron.J. 36 (2005) 578-580.
"Photoluminescence behavior of CdSe on GaAsOx/GaAs substrates"

(39) K.Ozasa, S.Nemoto, M.Maeda, and M.Hara,
J.Appl.Phys., 98 (2005) 084312-1..-5.
"Evaluation of insulator thickness through excitation-wavelength dependence of photoluminescence of CdSe/ZnS nanocrystals"

(40) K.Ozasa, S.Nemoto, M.Maeda, and M.Hara,
Physica E, 32 (2006) 89-92.
"Dependence of photoluminescence of CdSe/ZnS on excitation wavelength"

(41) K.Ozasa, S.Nemoto, M.Hara, and M.Maeda,
Phys.Sat.Sol. A, 203(9) (2006) 2287-2293.
"Modification/oxidation of GaAs surface in electrolytes for cell-culture bio-sensing devices"

(42) Y.H.Liang, Y.Arai, K.Ozasa, M.Ohashi, and E.Tsuchida,
Physica E, 36 (2007) 1-11.
"Simultaneous measurement of nanoprobe indentation force and photoluminescence of InGaAs/GaAs quantum dots and its simulation"

(43) S.Migita, K.Ozasa, T.Tanaka, and T.Haruyama,
Anal.Sci., 23(1) (2007) 45-48.
"Enzyme-based field-effect transistor for adenosine triphosphate (ATP) sensing"

(44) Y.H.Liang, M.Ohashi, Y.Arai, and K.Ozasa,
Phys.Rev. B, 75 (2007) 195318-1-10.
"Location of quantum dots identified by microscopic photoluminescence changes during nanoprobe indentation with a horizontal scan"

(45) K.Ozasa, S.Nemoto, M.Maeda, and M.Hara,
J.Appl.Phys., 101 (2007) 103503-1-6.
"Excitation wavelength dependent photoluminescence evolutions of CdSe/ZnS nanoparticles"

(46) K.Ozasa, S.Nemoto, M.Hara, M.Maeda, and K.Mochitate,
Surf.Sci., 601 (2007) 4536-4540.
"The passivation/modification of AlGaAs/GaAs surfaces by amorphous TiO2 for bio-sensing use in electrolytes"

(47) K.Ozasa, S.Nemoto, Y.Lee, K.Mochitate, M.Hara, and M.Maeda,
Appl.Surf.Sci., 254 (2007) 36-39.
"The surface of TiO2 gate of 2DEG-FET in contact with electrolytes for bio sensing use"

(48) S.Migita, K.Ozasa, S.Ikeno, T.Tanaka, and T.Haruyama,
Jpn.J.Appl.Phys., 46 (2007) 7539-7541.
"Molecular commonality sensing of phosphoric anhydride substances using an ion-sensitive field-effect transistor covered with an artificial enzyme membrane"

(49) Y.Li, T.Kunitake, S.Fujikawa, and K.Ozasa,
Langmuir, 23 (2007) 9109-9113.
"Photoluminescence modification in 3D-ordered films of fluorescent microspheres"

(50) K.Ozasa, S.Nemoto, Y.Li, M.Hara, M.Maeda, and K.Mochitate,
Surf.Interface Anal., 40 (2008) 579-583.
"Contact angle and biocompatibility of sol-gel prepared TiO2 thin films for their use as semiconductor-based cell-viability sensors"

(51) K.Ozasa, S.Nemoto, T.Isoshima, E.Ito, M.Maeda, and M.Hara
Surf.Interface Anal., 40 (2008) 579-583.
"Measurement of photo-patterned surface potential of Alq3 thin films by Kelvin-force microscope together with near-field optical stimulation"

(52) K.Ozasa, M.Maeda, M.Hara, M.Ohashi, Y.H.Liang, H.Kakoi, and Y.Arai,
Physica E, 40 (2008) 1920-1923.
"Localized strain effects on photoluminescence of quantum dots induced by nanoprobe indentation"

(53) K.Ozasa, S.Nemoto, T.Isoshima, E.Ito, M.Maeda, and M.Hara
Jpn.J.Appl.Phys., 47 (2008) 5630-5635.
"Direct measurement of transfer functions in Kelvin probe force microscopy using artificially patterned surface potentials"

(54) K.Ozasa, S.Nemoto, T.Isoshima, E.Ito, M.Maeda, and M.Hara
Appl.Phys.Lett., 93 (2008) 263304-1-3.
"Photoinduced reduction and pattern preservation of giant surface potential on tris(8-hydroxyquinolinato) aluminum(III) thin films"

(55) K.Ozasa, M.Maeda, M.Hara, H.Kakoi, L.Xu, Y.H.Liang, and Y.Arai,
J.Vac.Sci.Technol. B, 27 (2009) 934-938.
"Direct-to-indirect transition observed in quantum dot photoluminescence with nanoprobe indentation"

(56) K.Ozasa, M.Aono, M.Maeda, M.Hara,
Lecture Notes in Computer Science, 5715 (2009) 209-218.
"Simulation of Neurocomputing Based on Photophobic Reactions of Euglena - Toward Microbe-Based Neural Network Computing -"

(57) K.Ozasa, M.Aono, M.Maeda, M.Hara,
Biosystems, 100 (2010) 101-107.
"Simulation of neurocomputing based on the photophobic reactions of Euglena with optical feedback stimulation"

(58) K.Ozasa, S.Nemoto, M.Maeda, M.Hara,
J.Appl.Phys. 107 (2010) 103501-1-4.
"Kelvin probe force microscope with near-field photoexcitation"

(59) L.Xu, Y.Arai, K.Ozasa, H.Kakoi, Y.H.Liang, W.Araki,
Physica E, 42 (2010) 2441-2445.
"Estimation of the location of embedded InGaAs/GaAs quantum dots by measuring strain-induced blue shift of photoluminescence"

(60) K.Ozasa, H.Ito, M.Maeda, M.Hara,
Appl.Phys.Lett. 98 (2011) 013301.
"Photoinduced evolution of surface-potential undulation observed on vacuum-deposited thin films of tris(8-hydroxyquinolinato) aluminum"

(61) L.Xu, Y.Arai, K.Ozasa, H.Kakoi, Y.H.Liang, W.Araki,
J.Nanosci.Nanotechnol., 11 (2011) 106-114.
"Mechanism of Photoluminescence Quenching of InGaAs/GaAs Quantum Dots Resulting from Nanoprobe Indentation"

(62) K.Ozasa, H.Ito, M.Maeda, M.Hara,
Mater.Res.Soc.Symp.Proc., 1318 (2011) 1-5.
"Photoinduced Temporal Change of Surface-Potential Undulation on Alq3 Thin Films Observed by Kelvin Probe Force Microscopy"

(63) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
LabChip, 11 (2011) 1933-1940.
"Two-dimensional optical feedback control of Euglena confined in closed-type microfluidic channels"

(64) L.Xu, Y.Arai, W.Araki, T.Ogawa, K.Ozasa, M.Maeda, M.Hara,
J.Vac.Sci.Technol., B29 (2011) 051808-1-4.
"Improved estimation of embedded InGaAs/GaAs quantum dots locations using a domed-apex nanoprobe"

(65) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
Int.J.Unconventional Computing, 7 (2011) 481-499.
"Implementation of microbe-based neurocomputing with Euglena cells confined in microaquariums"

(66) K.Ozasa, H.Ito, M.Maeda, M.Hara,
J.Nanosci.Nanotechnol., 12 (2012) 499-502.
"Surface-potential undulation of Alq3 thin films prepared on ITO, Au, and n-Si"

(67) C.Y.Chen, K.Ozasa, K.Katsumata, M.Maeda, K.Okada, N.Matsushita,
J.Phys.Chem.C, 116 (2012) 8054-8062.
"Bioactive Titanium Oxide-Based Nanostructures Prepared by One-Step Hydrothermal Anodization"

(68) C.Y.Chen, K.Ozasa, K.Katsumata, M.Maeda, K.Okada, N.Matsushita,
Electrochem.Comm., 22 (2012) 101-104.
"CaTiO3 nanobricks prepared from anodized TiO2 nanotubes"

(69) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
Appl.Soft Comput., 13 (2013) 527-538.
"Euglena-based neurocomputing with two-dimensional optical feedback on swimming cells in micro-aquariums"

(70) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
Key Eng. Mater., 543 (2013) 431-434.
"Microfluidic Gas Sensing with Living Microbial Cells Confined in A Microaquarium"

(71) T.Hayashida, T.Kawashima, D.Nii, K.Ozasa, K.Umemura,
Chem. Lett., 42 (2013) 666-668.
"Kelvin Probe Force Microscopy of Single-Walled Carbon Nanotubes Modified with DNA or Polyethylene Glycol"

(72) S.Lee, S.Oh, J.Lee, Y.Malpani,Y-S.Jung, B.Kang, J.Y.Lee, K.Ozasa, T.Isoshima, S.Y.Lee, M.Hara, D.Hashizume, J-M.Kim,
Lagmuir, 29 (2013) 5869-5877.
"Stimulus-Responsive Azobenzene Supramolecules: Fibers, Gels and Hollow Spheres"

(73) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
LabChip, 13 (2013) 4033-4039.
"Gas/liquid sensing via chemotaxis of Euglena cells confined in an isolated micro-aquarium"

(74) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
Key Eng. Mater., 605 (2014) 95-98.
"Chemical sensing via chemotaxis of Euglena confined in an isolated micro-aquarium"

(75) K.Osaza, A.Mason, O.Korostynska, I.Nakouti, M.Ortoneda-Pedrola, M.Maeda, A.Al-Shamma'a,
Key Eng. Mater., 605 (2014) 432-436.
"Electromagnetic Wave Sensing of Euglena gracilis Viability and Quantification"

(76) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
Neurocomput., 140 (2014) 291-298.
"Analog Feedback in Euglena-Based Neural Network Computing \Enhancing Solution-Search Capability through Reaction Threshold Diversity among Cells\"
(77) K.Ozasa, J.Lee, S.Song, M.Maeda,
Plant Cell Physiol., 55 (2014) 1704-1712.
"Transient freezing behavior in photophobic responses of Euglena gracilis investigated in a microfluidic device"

(78) C.Y.Chen, K.Ozasa, K.Katsumata, M.Maeda, K.Okada, N.Matsushita,
Electrochim. Acta, 153 (2015) 409-415.
"Self-organization of TiO2 Nanobamboos by Anodization with Deep Eutectic Solvent"

(79) K.Ozasa, J.Lee, S.Song, M.Maeda,
Procedia Eng., 87 (2014) 512-515.
"Toxicity Sensing by Using Chemotactic Reaction of Microbial Cells Confined in Microfluidic Chip"

(80) K.Ozasa, J.Lee, S.Song, M.Hara, M.Maeda,
Artificial Life, 21 (2015) 234-246.
"Autonomous Pattern Formation of Micro-organic Cell Density with Optical Interlink between Two Isolated Culture Dishes"

(81) K.Ozasa, J.Lee, S.Song, M.Maeda,
Key Eng. Mater., 644 (2015) 185-188.
"Real-time analysis of chemotactic motion of Euglena cells confined in a microchip toxicity sensor"

(82) K.Ozasa, J.Won, S.Song, M.Maeda,
Sci. Rep., 6 (2016) 24602.
"Autonomous oscillation/separation of cell density artificially induced by optical interlink feedback as designed interaction between two isolated microalgae chips"

(83) N.Kanayama, T.Sekine, K.Ozasa, S.Kishi, T.Nyu, T.Hayashi, M.Maeda,
Langmuir, 32 (2016) 13296-13304.
"Terminal-Specific Interaction between Double-Stranded DNA Layers: Colloidal Dispersion Behavior and Surface Force"

(84) K.Ozasa, J.Won, S.Song, M.Maeda,
Procedia Eng., 168 (2016) 1450-1453.
"Toxic Effect Monitoring by Analyzing Swimming Motions of Microbial Cells Confined in Microfluidic Chip with Micro-Trench Flow Injection"

(85) K.Ozasa, J.Won, S.Song, S.Tamaki, T.Ishikawa, M.Maeda,
PLoS ONE, 12 (2017) e0172813.
"Temporal change of photophobic step-up responses of Euglena gracilis investigated through motion analysis"

(86) K.Koike, K.Yamamoto, S.Ohara, T.Kikitus, K.Ozasa, S.Nakamura, M.Sugiyama, Y.Nakano, K.Fujii,
Int. J. Hydrog. Energy, 42 (2017) 9493-9499.
"Effects of NiO-loading on n-type GaN photoanode for photoelectrochemical water splitting using different aqueous electrolytes"

(87) K.Ozasa, J.Won, S.Song, M.Maeda,
Appl. Soft Comput., 70 (2018) 539-549.
"Bio-inspired neurocomputing with 256 noise oscillators simulatingphoto response of Euglena cells"

(88) Y.-H.Chiu, T.-H.Lai, C.-Y.Chen, P.-Y.Hsieh, K.Ozasa, M.Niinomi, K.Okada, T.-F.M.Chang, N.Matsushita, M.Sone, Y.-J.Hsu,
ACS Appl. Mater. Interfaces, 10 (2018) 22997-23008.
"Fully Depleted Ti-Nb-Ta-Zr-O Nanotubes: Interfacial Charge Dynamics and Solar Hydrogen Production"

(89) K.Ozasa, J.Won, S.Song, M.Maeda,
Algal Res., 35 (2018) 98-105.
"Behavior of Euglena gracilis under simultaneous competing optical and chemical stimuli"

(90) T.Sekine, N.Kanayama, K.Ozasa, T.Nyu, T.Hayashi, M.Maeda,
Langmuir, 34 (2018) 15078-15083.
"Stochastic Binding Process of Blunt-End Stacking of DNA Molecules Observed by Atomic Force Microscopy"