Faculty Information - Kojima Osamu

Office

Academic background

Research activities

Works

（Last updated : 2026-05-28 19:32:18）

Kojima Osamu
Department of Electrical and Electronic Engineering, Faculty of Engineering

Graduate School of Engineering

Professor

■ Office

Tsudanuma Campus, No.2 Building,10th floor room 011009

■ Academic background

2002/04～2005/03

〔Doctorial Course〕, Graduate School, Division of Engineering, Osaka City University, Completed,

■ Research activities

1.	2004/08～	Optica
2.	2002/05～	The Physical Society of Japan

■ Works

1.	Article	Terahertz-wave generation via difference-frequency mixing from resonant above-barrier states in weakly strained InGaAs/GaAs multiple quantum wells Applied Physics Letters 128,pp.162103-1-162103-6 (Collaboration) 2026/04/23
2.	Article	Design of a sub-terahertz sensor using the electro-optic effect in a semiconductor microcavity J. Appl. Phys. 139,pp.153102-1-153102-7 (Collaboration) 2026/04/15
3.	Article	Terahertz wave radiation from plasma oscillations excited by pair of ultrashort optical pulses in a GaAs layer structure Japanese Journal of Applied Physics 64,pp.110904-1-110904-5 (Collaboration) 2025/11/20
4.	Article	Photo-Hall effect characterization and terahertz wave generation with 1550 nm excitation in InAs/GaAs quantum dot superlattice based photoconductive antenna J. Appl. Phys. 137,pp.213102-1-213102-8 (Collaboration) 2025/06/02
5.	Article	Terahertz wave generation via difference frequency mixing under nearly resonant exciton excitation with 1.5 μm band laser light in GaSb/AlGaSb multiple quantum wells Japanese Journal of Applied Physics 64(01),pp.011005-1-011005-4 (Collaboration) 2025/01/27
6.	Article	Lateral photoconductivity of InAs/GaAs quantum dots for 1.5 μm-wavelength　excitation photoconductive terahertz antenna devices Japanese Journal of Applied Physics 63,pp.082002-1-082002-5 (Collaboration) 2024/08/12
7.	Article	Effects of electric field screening induced by photogenerated carriers on terahertz wave measurement in a GaAs epitaxial structure Applied Physics Express 17(5),pp.051006 (Collaboration) 2024/05/14
8.	Article	Characteristics of ultrafast response induced by impulsive interference of excitons in a GaAs/AlAs multiple quantum well on a slightly strained buffer layer Applied Physics Express 16,pp.062009-1-062009-4^4 (Collaboration) 2023/06/23
9.	Article	Generation of nonlinear polarization to emit terahertz waves in above gap states in GaSb/AlGaSb multiple quantum wells Applied Physics Express 16,pp.051002-1-051002-4 (Collaboration) 2023/05/30
10.	Article	Control of electric field screening effects induced by photogenerated carriers for studies on ultrafast transient phenomena pp.52-57 (Collaboration) 2023/02/27
11.	Article	Increase in terahertz-wave intensity in a magnetic field due to difference-frequency mixing by exciton excitation in a GaAs/AlAs multiple quantum well Optics Express 30(7),pp.11789-11976 (Collaboration) 2022/03/28
12.	Article	Increase in terahertz-wave generation by difference frequency mixing by overlap of exciton states in different GaAs/AlAs quantum wells and spectroscopic measurements Optics Express 29(15),pp.24387-24395 (Collaboration) 2021/07/19
13.	Article	Modulation of exciton states through resonant excitation by continuous wave lasers in a GaAs/AlAs multiple quantum well Journal of Physics D: Applied Physics 54(33),pp.33516-1-7 (Collaboration) 2021/06/09
14.	Article	Photoluminescence excitation spectroscopy for structural and electronic characterization of resonant tunneling diodes for THz applications AIP Advances 11(3),pp.035122-1-5 (Collaboration) 2021/03/08
15.	Article	Resonant exciton excitation photoluminescence and dynamics in a GaAs/AlAs multiple quantum well with internal electric field AIP Advances 10(9),pp.095016-1-7 (Collaboration) 2020/09/14
16.	Article	Electron transport in a silicon crystal observed by energy transfer luminescence Japanese Journal of Applied Physics 59(8),pp.082005-1-4 (Collaboration) 2020/07/29
17.	Article	Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches Journal of Applied Physics 126(3),pp.033103-1-6 (Collaboration) 2019/07/16
18.	Article	Effect of modulation of ultrafast transient carrier dynamics by interface on terahertz signal Journal of Physics: Conference Series 1220,pp.012013-1-4 (Collaboration) 2019/05/24
19.	Article	Effects of a thin nitrogen-doped layer on terahertz dynamics in GaAs containing InAs quantum dots OSA Continuum 2(5),pp.1621-1628 (Collaboration) 2019/04/19
20.	Article	Broadband THz absorption spectrometer based on excitonic nonlinear optical effects Light: science & applications 8,pp.29-1-5 (Collaboration) 2019/03/13
21.	Article	Wide Frequency Tuning of Continuous Terahertz Wave Generated by Difference Frequency Mixing under Exciton-Excitation Conditions in a GaAs/AlAs Multiple Quantum Well Physical Review Applied 10(4),pp.044035-1-6 (Collaboration) 2018/10/12
22.	Article	Effect of lattice-mismatch strain on electron dynamics in InAs/GaAs quantum dots as seen by time-domain terahertz spectroscopy Journal of Physics D: Applied Physics 51(30),pp.305102-1-6 (Collaboration) 2018/07/04
23.	Article	Excitation of Thin Cyanine Films via Energy Transfer from Si Substrate Journal of the Physical Society of Japan 86,pp.094710-1-4 (Collaboration) 2017/08/31
24.	Article	Effects of non-exciton components excited by broadband pulses on quantum beats in a GaAs/AlAs multiple quantum well Scientific Reports 7,pp.41496-1-7 (Collaboration) 2017/01/27
25.	Article	Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films AIP Advances 6(7),pp.075209-1-7 (Collaboration) 2016/07/15
26.	Article	Effects of exciton line widths on the amplitude of quantum beat oscillations Applied Physics Express 9(6),pp.062801-1-3 (Collaboration) 2016/05/09
27.	Article	Fabrication of cyanine dye thin films grown by a layer-by-layer method Material Research Express 2(7),pp.076402-1-7 (Collaboration) 2015/07/17
28.	Article	Rapid dephasing related to intersubband transitions induced by exciton quantum beats observed by a pump-probe technique in a GaAs/AlAs multiple quantum well Physical Review B 91(12),pp.125307-1-4 (Collaboration) 2015/03/20
29.	Article	Effect of exciton oscillator strength on upconversion photoluminescence in GaAs/AlAs multiple quantum wells Applied Physics Letters 105(18),pp.181901-1-3 (Collaboration) 2014/11/03
30.	Article	Control of optical properties in cyanine dye thin film fabricated by a layer-by-layer method Journal of Applied Physics 115(8),pp.083503-1-4 (Collaboration) 2014/02/24
31.	Article	Pulse modulation towards low-power operation based on the quantum beat of excitons in a GaAs/AlAs multiple quantum well Journal of Physics D: Applied Physics 47(10),pp.105101-1-5 (Collaboration) 2014/02/19
32.	Article	Effects of pumping on propagation velocities of confined exciton polaritons in GaAs/Al_xGa_1-xAs double heterostructure thin films under resonant and non-resonant probe conditions Journal of Applied Physics 113(1),pp.013514-1-6 (Collaboration) 2013/01/04
33.	Article	Enhancement of optical anisotropy by interconnection effect along growth direction in multistacked quantum dots Japanese Journal of Applied Physics 52(1R),pp.012001-1-4 (Collaboration) 2012/12/12
34.	Article	Quantum beats of type-I and type-II excitons in an In_xGa_1−xAs/GaAs strained single quantum well Journal of Applied Physics 112(4),pp.043522-1-4 (Collaboration) 2012/08/31
35.	Article	Observation of quantum beat oscillations and ultrafast relaxation of excitons confined in GaAs thin films by controlling probe laser pulses Journal of Applied Physics 111(2),pp.023505-1-4 (Collaboration) 2012/01/19
36.	Article	Dynamics of above-barrier state excitons in multi-stacked quantum dots Journal of Applied Physics 110(9),pp.093515-1-4 (Collaboration) 2011/11/10
37.	Article	Extremely uniform bound exciton states in nitrogen δ-doped GaAs studied by photoluminescence spectroscopy in external magnetic fields Journal of Applied Physics 110(8),pp.083522-1-5 (Collaboration) 2011/10/24
38.	Article	Saturation of Förster resonance energy transfer between two optically nonlinear cyanine dyes of small Stokes shift energies in polymer thin films Journal of Applied Physics 110(8),pp.083521-1-5 (Collaboration) 2011/10/24
39.	Article	Depolarization effect on optical control of exciton states confined in GaAs thin films Journal of Applied Physics 110(4),pp.043514-1-5 (Collaboration) 2011/08/19
40.	Article	Observation of phase shifts in a vertical cavity quantum dot switch Applied Physics Letters 98(23),pp.231101-1-3 (Collaboration) 2011/06/06
41.	Article	Dephasing of excitonic polaritons confined in GaAs thin films Journal of Physical Society of Japan 80(3),pp.034704-1-5 (Collaboration) 2011/02/25
42.	Article	Intraband relaxation process in highly stacked quantum dots Physica Status Solidi C 8(1),pp.46-49 (Collaboration) 2010/12/08
43.	Article	Excitation power dependence of nonlinear optical response of excitons in GaAs/AlAs superlattices Physica Status Solidi C 8(1),pp.50-53 (Collaboration) 2010/12/02
44.	Article	Interaction between conduction-band edge and nitrogen-related localized levels in nitrogen δ-doped GaAs Physica Status Solidi C 8(2),pp.365-367 (Collaboration) 2010/11/15
45.	Article	Bound biexciton luminescence in nitrogen δ-doped GaAs Physica Status Solidi B 248(2),pp.464-467 (Collaboration) 2010/11/09
46.	Article	Propagation velocity of excitonic polaritons confined in GaAs thin films Physica Status Solidi C 8(2),pp.378-380 (Collaboration) 2010/11/02
47.	Article	Detailed design and characterization of all-optical switches based on InAs/GaAs quantum dots in a vertical cavity IEEE Journal of Quantum Electronics 46(11),pp.1582-1589 (Collaboration) 2010/08/23
48.	Article	Temperature-dependent carrier tunneling for self-assembled InAs/GaAs quantum dots with a GaAsN quantum well injector Applied Physics Letters 96(15),pp.151104-1-3 (Collaboration) 2010/04/13
49.	Article	Temperature dependence of photoluminescence characteristics of excitons in stacked quantum dots and quantum dot chains Journal of Applied Physics 107(7),pp.073506-1-4 (Collaboration) 2010/04/07
50.	Article	Vertical-geometry all-optical switches based on InAs/GaAs quantum dots in a cavity Applied Physics Letters 95(2),pp.021109-1-3 (Collaboration) 2009/07/16
51.	Article	Optical Kerr response to multi pump pulses on GaAs weakly confined exciton Physica Status Solidi C 6(6),pp.1509-1512 (Collaboration) 2009/06/08
52.	Article	Exciton response controlled by introducing a spacer layer in nitrided InAs quantum dots Physica Status Solidi C 6(S1),pp.S146-S149 (Collaboration) 2009/05/12
53.	Article	Transient reflectivity response with negative time delay caused by femtosecond pulse propagation in GaAs thin films Physica Status Solidi C 6(S1),pp.S139-S142 (Collaboration) 2009/05/12
54.	Article	Effects of indium segregation on optical properties of nitrogen-doped InAs/GaAs quantum dots Journal of Applied Physics 104(10),pp.103532-1-4 (Collaboration) 2008/11/24
55.	Article	Ultrafast All-Optical Control of Excitons Confined in GaAs Thin Films Applied Physics Express 1(11),pp.112401-1-3 (Collaboration) 2008/11/14
56.	Article	Spectral width dependence of residual carrier effect on nonlinear optical response of weakly confined excitons Physica Status Solidi C 5(9),pp.2858-2860 (Collaboration) 2008/07/08
57.	Article	Photoluminescence characteristics of quantum dots with electronic states interconnected along growth direction Journal of Applied Physics 103(11),pp.113504-1-6 (Collaboration) 2008/06/05
58.	Article	Ultrafast response induced by interference effects between weakly confined exciton states Journal of the Physical Society of Japan 77(4),pp.044701-1-4 (Collaboration) 2008/03/25
59.	Article	Photoluminescence dynamics of weakly confined excitons in GaAs thin films Journal of Luminescence 128(5-6),pp.1069-1071 (Collaboration) 2008/02/20
60.	Article	Ultrafast optical Kerr effect of excitons weakly confined in GaAs thin films Physica Status Solidi C 5(1),pp.360-363 (Collaboration) 2008/01/07
61.	Article	Decay of orientational grating of weakly confined excitons in GaAs thin films Journal of Luminescence 128(5-6),pp.963-965 (Collaboration) 2007/11/12
62.	Article	Effects of excitation spectral width on decay profile of weakly confined excitons Journal of Luminescence 128(5-6),pp.966-968 (Collaboration) 2007/11/12
63.	Article	Photoluminescence dynamics of coupled quantum dots Journal of Luminescence 128(5-6),pp.975-977 (Collaboration) 2007/11/12
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