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Akio Sasaki - One of the best experts on this subject based on the ideXlab platform.

  • Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells
    IEEE Journal of Quantum Electronics, 1996
    Co-Authors: Susumu Noda, M. Ohya, T. Sakamoto, Akio Sasaki
    Abstract:

    Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells is investigated. Theoretical calculation for the Modulation is carried out by considering not only the excitonic interband-transition but also the continuous level transition between the conduction and valence bands. The Modulation characteristics are compared with those of the Modulation using n-doped quantum wells. The possibility of the Modulation using undoped quantum well is successfully shown by real-time single-shot experiment using Ti-Al/sub 2/O/sub 3/ and CO/sub 2/ lasers for interband- and intersubband-resonant Lights at room temperature.

  • Analysis on interband-resonant Light Modulation by intersubband-resonant Light in n-doped quantum wells
    IEEE Journal of Quantum Electronics, 1992
    Co-Authors: Susumu Noda, T. Uemura, Takao Yamashita, Akio Sasaki
    Abstract:

    The authors describe a theoretical analysis on interband-resonant Light Modulation by intersubband-resonant Light in the n-doped quantum well. The Modulation principle is briefly explained. The theoretical formulation for the Modulation is derived by using density matrix theory. The Modulation characteristics concerning the absorption coefficient and refractive index are calculated for various parameters. It is shown that the absorption coefficient for the interband-resonant Light can be greatly changed by the incidence of intersubband-resonant Light. >

Susumu Noda - One of the best experts on this subject based on the ideXlab platform.

  • Ultrafast Interband-Resonant Light Modulation by Intersubband-Resonant Light in Quantum Wells
    Springer Series in Photonics, 1999
    Co-Authors: Susumu Noda
    Abstract:

    Ultrafast interband-resonant Light Modulation by intersubband-resonant Light in n-doped quantum wells is described. A picosecond-range Modulation with 100% Modulation depth is achieved successfully by utilizing a free-electron laser as the intersubband-resonant Light. It is also shown that the intersubband transition wavelength can be shorter than 2 μn with AlAs/InGaAs quantum well structure on a GaAs substrate. The energy relaxation for the short wavelength intersubband transition is investigated by a pump and probe measurement, and a relaxation time as short as 2.7 ps is demonstrated.

  • Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells
    IEEE Journal of Quantum Electronics, 1996
    Co-Authors: Susumu Noda, M. Ohya, T. Sakamoto, Akio Sasaki
    Abstract:

    Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells is investigated. Theoretical calculation for the Modulation is carried out by considering not only the excitonic interband-transition but also the continuous level transition between the conduction and valence bands. The Modulation characteristics are compared with those of the Modulation using n-doped quantum wells. The possibility of the Modulation using undoped quantum well is successfully shown by real-time single-shot experiment using Ti-Al/sub 2/O/sub 3/ and CO/sub 2/ lasers for interband- and intersubband-resonant Lights at room temperature.

  • Analysis on interband-resonant Light Modulation by intersubband-resonant Light in n-doped quantum wells
    IEEE Journal of Quantum Electronics, 1992
    Co-Authors: Susumu Noda, T. Uemura, Takao Yamashita, Akio Sasaki
    Abstract:

    The authors describe a theoretical analysis on interband-resonant Light Modulation by intersubband-resonant Light in the n-doped quantum well. The Modulation principle is briefly explained. The theoretical formulation for the Modulation is derived by using density matrix theory. The Modulation characteristics concerning the absorption coefficient and refractive index are calculated for various parameters. It is shown that the absorption coefficient for the interband-resonant Light can be greatly changed by the incidence of intersubband-resonant Light. >

T. Sakamoto - One of the best experts on this subject based on the ideXlab platform.

  • Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells
    IEEE Journal of Quantum Electronics, 1996
    Co-Authors: Susumu Noda, M. Ohya, T. Sakamoto, Akio Sasaki
    Abstract:

    Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells is investigated. Theoretical calculation for the Modulation is carried out by considering not only the excitonic interband-transition but also the continuous level transition between the conduction and valence bands. The Modulation characteristics are compared with those of the Modulation using n-doped quantum wells. The possibility of the Modulation using undoped quantum well is successfully shown by real-time single-shot experiment using Ti-Al/sub 2/O/sub 3/ and CO/sub 2/ lasers for interband- and intersubband-resonant Lights at room temperature.

M. Ohya - One of the best experts on this subject based on the ideXlab platform.

  • Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells
    IEEE Journal of Quantum Electronics, 1996
    Co-Authors: Susumu Noda, M. Ohya, T. Sakamoto, Akio Sasaki
    Abstract:

    Interband-resonant Light Modulation by intersubband-resonant Light in undoped quantum wells is investigated. Theoretical calculation for the Modulation is carried out by considering not only the excitonic interband-transition but also the continuous level transition between the conduction and valence bands. The Modulation characteristics are compared with those of the Modulation using n-doped quantum wells. The possibility of the Modulation using undoped quantum well is successfully shown by real-time single-shot experiment using Ti-Al/sub 2/O/sub 3/ and CO/sub 2/ lasers for interband- and intersubband-resonant Lights at room temperature.

Changsheng Xie - One of the best experts on this subject based on the ideXlab platform.

  • Temperature & Light Modulation to enhance the selectivity of Pt-modified zinc oxide gas sensor
    Sensors and Actuators B: Chemical, 2017
    Co-Authors: Qian Deng, Gao Shi, Tao Lei, Yansong Ling, Shunping Zhang, Changsheng Xie
    Abstract:

    Abstract Metal oxide (MOX) has been used as resistive gas sensors for a long time. The gas sensitive response under constant temperature measurement is a broad-spectrum response, resulting in poor selectivity. To solve this problem and enhance the selectivity of a single sensing film, gas sensor based on Pt-modified zinc oxide was prepared by homogeneous precipitation and screen printing method. Afterwards, the temperature & Light Modulation method is first proposed herein. This method allows us to obtain different Resistance-Temperature (R-T) curves and characteristic parameters, photoresponse and photorelaxation. Combined with pattern recognition method, five tested gases, including ethanol, methanol, acetone, formic acid and ethyl ether, can be successfully classified. Compared with temperature Modulation, which is usually used as a method to enhance selectivity, temperature & Light Modulation method can increase the classification rate from 95.55% to 100% for sensing these five tested gases. The results indicate that the temperature & Light Modulation method is an effective method for improving the selectivity of the gas sensor.