The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Masatsune Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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High Performance Ultrasonic Transducers Employing ZnO/Pyrex-Glass Diaphragm Structure on a Si Substrate
Japanese Journal of Applied Physics, 2014Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-Glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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THIN-FILM BULK ACOUSTIC RESONATORS EMPLOYING ZNO/Pyrex-Glass COMPOSITE DIAPHRAGM STRUCTURE
Japanese Journal of Applied Physics, 1994Co-Authors: Yoshiki Makishima, Ken-ya Hashimoto, Masatsune YamaguchiAbstract:This paper discusses the application of ZnO/Pyrex-Glass composite diaphragm structure to thin-film bulk acoustic resonators (FBARs). Analysis of ZnO/Pyrex-Glass composite diaphragm structure showed for thickness-longitudinal vibration that zero temperature coefficient of frequency with relatively large electromechanical coupling constant of about 20% is realised for the second- and third-order resonances as well as for the fundamental resonance. An FBAR employing the ZnO/Pyrex-Glass composite diaphragm structure was fabricated, and Q values of 970 and 858 were obtained, respectively, for the fundamental and second-order resonances at 298.7 MHz and 497.5 MHz.
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thin film bulk acoustic resonators employing zno Pyrex Glass composite diaphragm structure
Japanese Journal of Applied Physics, 1994Co-Authors: Yoshiki Makishima, Ken-ya Hashimoto, Masatsune YamaguchiAbstract:This paper discusses the application of ZnO/Pyrex-Glass composite diaphragm structure to thin-film bulk acoustic resonators (FBARs). Analysis of ZnO/Pyrex-Glass composite diaphragm structure showed for thickness-longitudinal vibration that zero temperature coefficient of frequency with relatively large electromechanical coupling constant of about 20% is realised for the second- and third-order resonances as well as for the fundamental resonance. An FBAR employing the ZnO/Pyrex-Glass composite diaphragm structure was fabricated, and Q values of 970 and 858 were obtained, respectively, for the fundamental and second-order resonances at 298.7 MHz and 497.5 MHz.
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high performance ultrasonic transducers employing zno Pyrex Glass diaphragm structure on a si substrate
Japanese Journal of Applied Physics, 1991Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-Glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
Yingguang Zheng - One of the best experts on this subject based on the ideXlab platform.
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three types of site of mn2 in zns mn2 nanocrystal Pyrex Glass composites
Journal of Physics: Condensed Matter, 1999Co-Authors: Junye Liu, Chunxu Liu, Yingguang ZhengAbstract:ZnS:Mn2+ nanocrystals embedded in Pyrex Glass matrices have been studied systematically. It has been found by photoluminescence (PL) and excitation (PLE) spectra that doped Mn impurities can be classified as two types, occupying substitutional sites (Mn2+)sub and interstitial sites (Mn2+)int. EPR experiments support this conclusion. In addition, Mn clusters were also identified from the EPR spectra. We observed the increases in the g1 factors and hyperfine structure (HFS) constants with decreasing diameters of the nanocrystals. These increases are due to the hybridization between s-p states of ZnS and d states of the Mn ions by quantum confinement effects and the surface states.
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Three types of site of Mn2+ in ZnS :Mn2+ nanocrystal/Pyrex Glass composites
Journal of Physics: Condensed Matter, 1999Co-Authors: Junye Liu, Chunxu Liu, Yingguang ZhengAbstract:ZnS:Mn2+ nanocrystals embedded in Pyrex Glass matrices have been studied systematically. It has been found by photoluminescence (PL) and excitation (PLE) spectra that doped Mn impurities can be classified as two types, occupying substitutional sites (Mn2+)sub and interstitial sites (Mn2+)int. EPR experiments support this conclusion. In addition, Mn clusters were also identified from the EPR spectra. We observed the increases in the g1 factors and hyperfine structure (HFS) constants with decreasing diameters of the nanocrystals. These increases are due to the hybridization between s-p states of ZnS and d states of the Mn ions by quantum confinement effects and the surface states.
Ken-ya Hashimoto - One of the best experts on this subject based on the ideXlab platform.
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High Performance Ultrasonic Transducers Employing ZnO/Pyrex-Glass Diaphragm Structure on a Si Substrate
Japanese Journal of Applied Physics, 2014Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-Glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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THIN-FILM BULK ACOUSTIC RESONATORS EMPLOYING ZNO/Pyrex-Glass COMPOSITE DIAPHRAGM STRUCTURE
Japanese Journal of Applied Physics, 1994Co-Authors: Yoshiki Makishima, Ken-ya Hashimoto, Masatsune YamaguchiAbstract:This paper discusses the application of ZnO/Pyrex-Glass composite diaphragm structure to thin-film bulk acoustic resonators (FBARs). Analysis of ZnO/Pyrex-Glass composite diaphragm structure showed for thickness-longitudinal vibration that zero temperature coefficient of frequency with relatively large electromechanical coupling constant of about 20% is realised for the second- and third-order resonances as well as for the fundamental resonance. An FBAR employing the ZnO/Pyrex-Glass composite diaphragm structure was fabricated, and Q values of 970 and 858 were obtained, respectively, for the fundamental and second-order resonances at 298.7 MHz and 497.5 MHz.
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thin film bulk acoustic resonators employing zno Pyrex Glass composite diaphragm structure
Japanese Journal of Applied Physics, 1994Co-Authors: Yoshiki Makishima, Ken-ya Hashimoto, Masatsune YamaguchiAbstract:This paper discusses the application of ZnO/Pyrex-Glass composite diaphragm structure to thin-film bulk acoustic resonators (FBARs). Analysis of ZnO/Pyrex-Glass composite diaphragm structure showed for thickness-longitudinal vibration that zero temperature coefficient of frequency with relatively large electromechanical coupling constant of about 20% is realised for the second- and third-order resonances as well as for the fundamental resonance. An FBAR employing the ZnO/Pyrex-Glass composite diaphragm structure was fabricated, and Q values of 970 and 858 were obtained, respectively, for the fundamental and second-order resonances at 298.7 MHz and 497.5 MHz.
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high performance ultrasonic transducers employing zno Pyrex Glass diaphragm structure on a si substrate
Japanese Journal of Applied Physics, 1991Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-Glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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Ultrasonic transducers employing a ZnO/Pyrex-Glass membrane on a Si substrate
IEEE Symposium on Ultrasonics, 1990Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, M. YamaguchiAbstract:The authors propose a ZnO/Pyrex-Glass membrane structure for developing low-loss, spurious-free, wide-bandwidth underwater ultrasonic transducers in the VHF and UHF ranges. Since Pyrex-Glass possesses a small acoustic impedance, it behaves as an effective acoustic matching layer between the ZnO film and water. Theoretical analysis suggested that high-performance transducers can be realized by properly determining the thickness ratio of the Pyrex-Glass film relative to the ZnO film. It was experimentally shown that the ZnO/Pyrex-Glass membrane transducer successfully radiates and detects ultrasonic waves at the fundamental frequency of 155 MHz with a relative -3 dB bandwidth of 11.1% and a minimum transduction loss of 4.3 dB, which are in good agreement with the theoretical calculation. >
Y. Yamada - One of the best experts on this subject based on the ideXlab platform.
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High Performance Ultrasonic Transducers Employing ZnO/Pyrex-Glass Diaphragm Structure on a Si Substrate
Japanese Journal of Applied Physics, 2014Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-Glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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high performance ultrasonic transducers employing zno Pyrex Glass diaphragm structure on a si substrate
Japanese Journal of Applied Physics, 1991Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-Glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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Ultrasonic transducers employing a ZnO/Pyrex-Glass membrane on a Si substrate
IEEE Symposium on Ultrasonics, 1990Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, M. YamaguchiAbstract:The authors propose a ZnO/Pyrex-Glass membrane structure for developing low-loss, spurious-free, wide-bandwidth underwater ultrasonic transducers in the VHF and UHF ranges. Since Pyrex-Glass possesses a small acoustic impedance, it behaves as an effective acoustic matching layer between the ZnO film and water. Theoretical analysis suggested that high-performance transducers can be realized by properly determining the thickness ratio of the Pyrex-Glass film relative to the ZnO film. It was experimentally shown that the ZnO/Pyrex-Glass membrane transducer successfully radiates and detects ultrasonic waves at the fundamental frequency of 155 MHz with a relative -3 dB bandwidth of 11.1% and a minimum transduction loss of 4.3 dB, which are in good agreement with the theoretical calculation. >
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ultrasonic transducers employing a zno Pyrex Glass membrane on a si substrate
IEEE Symposium on Ultrasonics, 1990Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, M. YamaguchiAbstract:The authors propose a ZnO/Pyrex-Glass membrane structure for developing low-loss, spurious-free, wide-bandwidth underwater ultrasonic transducers in the VHF and UHF ranges. Since Pyrex-Glass possesses a small acoustic impedance, it behaves as an effective acoustic matching layer between the ZnO film and water. Theoretical analysis suggested that high-performance transducers can be realized by properly determining the thickness ratio of the Pyrex-Glass film relative to the ZnO film. It was experimentally shown that the ZnO/Pyrex-Glass membrane transducer successfully radiates and detects ultrasonic waves at the fundamental frequency of 155 MHz with a relative -3 dB bandwidth of 11.1% and a minimum transduction loss of 4.3 dB, which are in good agreement with the theoretical calculation. >
Junye Liu - One of the best experts on this subject based on the ideXlab platform.
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three types of site of mn2 in zns mn2 nanocrystal Pyrex Glass composites
Journal of Physics: Condensed Matter, 1999Co-Authors: Junye Liu, Chunxu Liu, Yingguang ZhengAbstract:ZnS:Mn2+ nanocrystals embedded in Pyrex Glass matrices have been studied systematically. It has been found by photoluminescence (PL) and excitation (PLE) spectra that doped Mn impurities can be classified as two types, occupying substitutional sites (Mn2+)sub and interstitial sites (Mn2+)int. EPR experiments support this conclusion. In addition, Mn clusters were also identified from the EPR spectra. We observed the increases in the g1 factors and hyperfine structure (HFS) constants with decreasing diameters of the nanocrystals. These increases are due to the hybridization between s-p states of ZnS and d states of the Mn ions by quantum confinement effects and the surface states.
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Three types of site of Mn2+ in ZnS :Mn2+ nanocrystal/Pyrex Glass composites
Journal of Physics: Condensed Matter, 1999Co-Authors: Junye Liu, Chunxu Liu, Yingguang ZhengAbstract:ZnS:Mn2+ nanocrystals embedded in Pyrex Glass matrices have been studied systematically. It has been found by photoluminescence (PL) and excitation (PLE) spectra that doped Mn impurities can be classified as two types, occupying substitutional sites (Mn2+)sub and interstitial sites (Mn2+)int. EPR experiments support this conclusion. In addition, Mn clusters were also identified from the EPR spectra. We observed the increases in the g1 factors and hyperfine structure (HFS) constants with decreasing diameters of the nanocrystals. These increases are due to the hybridization between s-p states of ZnS and d states of the Mn ions by quantum confinement effects and the surface states.
