The Experts below are selected from a list of 10260 Experts worldwide ranked by ideXlab platform
Jinyun Zhou - One of the best experts on this subject based on the ideXlab platform.
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SURFACE-COVERED 1×3 GRATING WITH DIELECTRIC-METAL SLABS UNDER SECOND BRAGG INCIDENCE
Surface Review and Letters, 2020Co-Authors: Bo Wang, Liang Lei, Li Chen, Wenhua Zhu, Kunhua Wen, Ziming Meng, Xiangjun Xing, Zhaogang Nie, Jinyun ZhouAbstract:This paper designed a novel three-port reflective surface-covered grating with a Connecting Layer. The grating can be used as a splitter, and the polarized light can be divided into zero order, fir...
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Dual-function splitting of the embedded grating with Connecting Layer
Modern Physics Letters B, 2019Co-Authors: Wenhua Zhu, Bo Wang, Liang Lei, Li Chen, Chenhao Gao, Kunhua Wen, Ziming Meng, Qu Wang, Xiangjun Xing, Jinyun ZhouAbstract:We design and optimize the embedded dual-function grating with Connecting Layer in Littrow mounting. By using modal method and rigorous coupled-wave analysis, grating parameters are analyzed and ca...
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SURFACE-RELIEF THREE-PORT OUTPUT WITH A Connecting Layer GRATING UNDER THE SECOND BRAGG CONDITION
Surface Review and Letters, 2019Co-Authors: Bo Wang, Liang Lei, Li Chen, Wenhua Zhu, Sufang Yin, Jinyun ZhouAbstract:A three-port surface-relief grating with a Connecting Layer under the second Bragg condition is put forward and designed for the free space application in this paper. Such grating can function as a beam splitter, which can split the polarized light into the [Formula: see text]2nd order and the [Formula: see text]1st order and the 0th order based on the optimum grating profile parameters. By using rigorous coupled-wave analysis, a highly-efficient polarization-dependent Connecting-Layer-based grating can be obtained with the optimum different depths and thicknesses with the grating duty cycle of 0.65 and grating period of 1150[Formula: see text]nm. On the basis of the designed grating profile parameters, a modal method can explain the propagating process. Compared with the conventional surface-relief fused-silica grating, the diffraction efficiencies for TE polarization in three orders are improved. Therefore, the novel conception of the grating under the second Bragg condition is significant for further applications such as interferometer with improved efficiency for TE polarization.
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Dual channel Connecting Layer based embedded reflective splitter
Journal of Optoelectronics and Advanced Materials, 2019Co-Authors: Chenhao Gao, Bo Wang, Liang Lei, Kunhua Wen, Ziming Meng, Jimin Fang, Zhaogang Nie, Jinyun ZhouAbstract:We design and optimize dual channel reflection subwavelength grating with good uniformity. Given an incident wavelength of 1550 nm and grating period of 1540 nm, the simplified modal method can be used to obtain the optimized duty cycle and grating groove depth. By using the rigorous couple d wave analysis, grating parameters are analyzed and calculated. For TE and TM polarization, a good splitting ratio can be exhibited with 48.5%/48.4% and 48.1%/48.1%, respectively Previous subwavelength gratings worked only at narrow bandwidth. The design ed dual channel Connecting Layer based embedded reflective grating can show the wide bandwidth.
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Encapsulated polarization-selective splitting grating with metal-mirror-based features
Journal of Optoelectronics and Advanced Materials, 2019Co-Authors: Wenhua Zhu, Bo Wang, Liang Lei, Chenhao Gao, Kunhua Wen, Ziming Meng, Xiangjun Xing, Jinyun ZhouAbstract:We design and optimize the sandwiched reflective polarization-selective grating in Littrow mounting. By using the modal method and the rigorous coupled-wave analysis, grating parameters are analyzed and calculated including grating groove depth, thickness of Connecting Layer, and so on. The grating device can diffract the transverse electric-polarized plane light only in the -1st diffractive order with high reflection efficiency of 97.91%. Meanwhile, for the transverse magnetic-polarized plane light, diffraction efficiencies in the 0th order and the -1st order correspond to 48.67% and 48.68%, respectively.
Bo Wang - One of the best experts on this subject based on the ideXlab platform.
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SURFACE-COVERED 1×3 GRATING WITH DIELECTRIC-METAL SLABS UNDER SECOND BRAGG INCIDENCE
Surface Review and Letters, 2020Co-Authors: Bo Wang, Liang Lei, Li Chen, Wenhua Zhu, Kunhua Wen, Ziming Meng, Xiangjun Xing, Zhaogang Nie, Jinyun ZhouAbstract:This paper designed a novel three-port reflective surface-covered grating with a Connecting Layer. The grating can be used as a splitter, and the polarized light can be divided into zero order, fir...
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Dual-function splitting of the embedded grating with Connecting Layer
Modern Physics Letters B, 2019Co-Authors: Wenhua Zhu, Bo Wang, Liang Lei, Li Chen, Chenhao Gao, Kunhua Wen, Ziming Meng, Qu Wang, Xiangjun Xing, Jinyun ZhouAbstract:We design and optimize the embedded dual-function grating with Connecting Layer in Littrow mounting. By using modal method and rigorous coupled-wave analysis, grating parameters are analyzed and ca...
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SURFACE-RELIEF THREE-PORT OUTPUT WITH A Connecting Layer GRATING UNDER THE SECOND BRAGG CONDITION
Surface Review and Letters, 2019Co-Authors: Bo Wang, Liang Lei, Li Chen, Wenhua Zhu, Sufang Yin, Jinyun ZhouAbstract:A three-port surface-relief grating with a Connecting Layer under the second Bragg condition is put forward and designed for the free space application in this paper. Such grating can function as a beam splitter, which can split the polarized light into the [Formula: see text]2nd order and the [Formula: see text]1st order and the 0th order based on the optimum grating profile parameters. By using rigorous coupled-wave analysis, a highly-efficient polarization-dependent Connecting-Layer-based grating can be obtained with the optimum different depths and thicknesses with the grating duty cycle of 0.65 and grating period of 1150[Formula: see text]nm. On the basis of the designed grating profile parameters, a modal method can explain the propagating process. Compared with the conventional surface-relief fused-silica grating, the diffraction efficiencies for TE polarization in three orders are improved. Therefore, the novel conception of the grating under the second Bragg condition is significant for further applications such as interferometer with improved efficiency for TE polarization.
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Dual channel Connecting Layer based embedded reflective splitter
Journal of Optoelectronics and Advanced Materials, 2019Co-Authors: Chenhao Gao, Bo Wang, Liang Lei, Kunhua Wen, Ziming Meng, Jimin Fang, Zhaogang Nie, Jinyun ZhouAbstract:We design and optimize dual channel reflection subwavelength grating with good uniformity. Given an incident wavelength of 1550 nm and grating period of 1540 nm, the simplified modal method can be used to obtain the optimized duty cycle and grating groove depth. By using the rigorous couple d wave analysis, grating parameters are analyzed and calculated. For TE and TM polarization, a good splitting ratio can be exhibited with 48.5%/48.4% and 48.1%/48.1%, respectively Previous subwavelength gratings worked only at narrow bandwidth. The design ed dual channel Connecting Layer based embedded reflective grating can show the wide bandwidth.
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Encapsulated polarization-selective splitting grating with metal-mirror-based features
Journal of Optoelectronics and Advanced Materials, 2019Co-Authors: Wenhua Zhu, Bo Wang, Liang Lei, Chenhao Gao, Kunhua Wen, Ziming Meng, Xiangjun Xing, Jinyun ZhouAbstract:We design and optimize the sandwiched reflective polarization-selective grating in Littrow mounting. By using the modal method and the rigorous coupled-wave analysis, grating parameters are analyzed and calculated including grating groove depth, thickness of Connecting Layer, and so on. The grating device can diffract the transverse electric-polarized plane light only in the -1st diffractive order with high reflection efficiency of 97.91%. Meanwhile, for the transverse magnetic-polarized plane light, diffraction efficiencies in the 0th order and the -1st order correspond to 48.67% and 48.68%, respectively.
Jiangshan Chen - One of the best experts on this subject based on the ideXlab platform.
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C70/C70:pentacene/pentacene organic heterojunction as the Connecting Layer for high performance tandem organic light-emitting diodes: Mechanism investigation of electron injection and transport
Journal of Applied Physics, 2017Co-Authors: Qingxun Guo, Dezhi Yang, Jiangshan Chen, Xianfeng Qiao, Tansir Ahamad, Saad M. AlshehriAbstract:A high performance tandem organic light-emitting diode (OLED) is realized by employing a C70/C70:pentacene/pentacene organic heterojunction as the efficient charge generation Layer (CGL). Not only more than two time enhancement of external quantum efficiency but also significant improvement in both power efficiency and lifetime are well achieved. The mechanism investigations find that the electron injection from the CGL to the adjacent electron transport Layer (ETL) in tandem devices is injection rate-limited due to the high interface energy barrier between the CGL and the ETL. By the capacitance-frequency (C-F) and low temperature current density-voltage (J-V) characteristic analysis, we confirm that the electron transport is a space-charge-limited current process with exponential trap distribution. These traps are localized states below the lowest unoccupied molecular orbital edge inside the gap and would be filled with the upward shift of the Fermi level during the n-doping process. Furthermore, both t...
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c70 c70 pentacene pentacene organic heterojunction as the Connecting Layer for high performance tandem organic light emitting diodes mechanism investigation of electron injection and transport
Journal of Applied Physics, 2017Co-Authors: Qingxun Guo, Dezhi Yang, Jiangshan Chen, Xianfeng Qiao, Tansir Ahamad, Saad M. AlshehriAbstract:A high performance tandem organic light-emitting diode (OLED) is realized by employing a C70/C70:pentacene/pentacene organic heterojunction as the efficient charge generation Layer (CGL). Not only more than two time enhancement of external quantum efficiency but also significant improvement in both power efficiency and lifetime are well achieved. The mechanism investigations find that the electron injection from the CGL to the adjacent electron transport Layer (ETL) in tandem devices is injection rate-limited due to the high interface energy barrier between the CGL and the ETL. By the capacitance-frequency (C-F) and low temperature current density-voltage (J-V) characteristic analysis, we confirm that the electron transport is a space-charge-limited current process with exponential trap distribution. These traps are localized states below the lowest unoccupied molecular orbital edge inside the gap and would be filled with the upward shift of the Fermi level during the n-doping process. Furthermore, both t...
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Charge generation mechanism of tandem organic light emitting diodes with pentacene/C70 organic heterojunction as the Connecting Layer
Journal of Materials Chemistry C, 2016Co-Authors: Qingxun Guo, Hengda Sun, Jiaxiu Wang, Dezhi Yang, Jiangshan ChenAbstract:The working mechanism of a planar organic heterojunction based on pentacene/C70 under reverse voltage is studied through current–voltage (I–V) and capacitance–voltage (C–V) measurements. It is found that the pentacene/C70 heterojunction generates large amounts of charges and the charge generation is a tunneling process. The proposed Fowler–Nordheim (F–N) model theoretically demonstrates the I–V properties of the pentacene/C70 heterojunction-based device at different temperatures. The heterojunction interface energy diagram is also well determined by ultraviolet photoemission spectroscopy (UPS) measurements, further elucidating this tunneling process. Moreover, by taking advantage of the large charge generation property of the pentacene/C70 heterojunction, a high efficiency green tandem organic light emitting diode (OLED) is successfully fabricated, where not only the current efficiency is doubled, but also the power efficiency is greatly enhanced, proving the excellent performance of the pentacene/C70 heterojunction as charge generation Layer (CGL). This work highlights the working mechanism of such heterojunction and provides us a new guide to design high performance tandem OLEDs.
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charge generation mechanism of tandem organic light emitting diodes with pentacene c70 organic heterojunction as the Connecting Layer
Journal of Materials Chemistry C, 2016Co-Authors: Qingxun Guo, Hengda Sun, Jiaxiu Wang, Dezhi Yang, Jiangshan ChenAbstract:The working mechanism of a planar organic heterojunction based on pentacene/C70 under reverse voltage is studied through current–voltage (I–V) and capacitance–voltage (C–V) measurements. It is found that the pentacene/C70 heterojunction generates large amounts of charges and the charge generation is a tunneling process. The proposed Fowler–Nordheim (F–N) model theoretically demonstrates the I–V properties of the pentacene/C70 heterojunction-based device at different temperatures. The heterojunction interface energy diagram is also well determined by ultraviolet photoemission spectroscopy (UPS) measurements, further elucidating this tunneling process. Moreover, by taking advantage of the large charge generation property of the pentacene/C70 heterojunction, a high efficiency green tandem organic light emitting diode (OLED) is successfully fabricated, where not only the current efficiency is doubled, but also the power efficiency is greatly enhanced, proving the excellent performance of the pentacene/C70 heterojunction as charge generation Layer (CGL). This work highlights the working mechanism of such heterojunction and provides us a new guide to design high performance tandem OLEDs.
Jennifer Rexford - One of the best experts on this subject based on the ideXlab platform.
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proactive routing in scalable data centers with paris
ACM Special Interest Group on Data Communication, 2014Co-Authors: Dushyant Arora, Theophilus Benson, Jennifer RexfordAbstract:Modern data centers must scale to a large number of servers, while offering flexible placement and migration of virtual machines. The traditional approach of Connecting Layer-two pods through a Layer-three core constrains VM placement. More recent 'flat' designs are more flexible but have scalability limitations due to flooding/broadcasting or querying directories of VM locations. Rather than reactively learn VM locations, our PARIS architecture has a controller that pre-positions IP forwarding entries in the switches. Switches within a pod have complete information about the VMs beneath them, while each core switch maintains complete forwarding state for part of the address space. PARIS offers network designers the flexibility to choose a topology that meets their latency and bandwidth requirements. We evaluate our PARIS prototype built using OpenFlow-compliant switches and NOX controller. Using PARIS we can build a data center network that supports up to 100K servers.
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DCC@SIGCOMM - ProActive routing in scalable data centers with PARIS
Proceedings of the 2014 ACM SIGCOMM workshop on Distributed cloud computing - DCC '14, 2014Co-Authors: Dushyant Arora, Theophilus Benson, Jennifer RexfordAbstract:Modern data centers must scale to a large number of servers, while offering flexible placement and migration of virtual machines. The traditional approach of Connecting Layer-two pods through a Layer-three core constrains VM placement. More recent 'flat' designs are more flexible but have scalability limitations due to flooding/broadcasting or querying directories of VM locations. Rather than reactively learn VM locations, our PARIS architecture has a controller that pre-positions IP forwarding entries in the switches. Switches within a pod have complete information about the VMs beneath them, while each core switch maintains complete forwarding state for part of the address space. PARIS offers network designers the flexibility to choose a topology that meets their latency and bandwidth requirements. We evaluate our PARIS prototype built using OpenFlow-compliant switches and NOX controller. Using PARIS we can build a data center network that supports up to 100K servers.
Saad M. Alshehri - One of the best experts on this subject based on the ideXlab platform.
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C70/C70:pentacene/pentacene organic heterojunction as the Connecting Layer for high performance tandem organic light-emitting diodes: Mechanism investigation of electron injection and transport
Journal of Applied Physics, 2017Co-Authors: Qingxun Guo, Dezhi Yang, Jiangshan Chen, Xianfeng Qiao, Tansir Ahamad, Saad M. AlshehriAbstract:A high performance tandem organic light-emitting diode (OLED) is realized by employing a C70/C70:pentacene/pentacene organic heterojunction as the efficient charge generation Layer (CGL). Not only more than two time enhancement of external quantum efficiency but also significant improvement in both power efficiency and lifetime are well achieved. The mechanism investigations find that the electron injection from the CGL to the adjacent electron transport Layer (ETL) in tandem devices is injection rate-limited due to the high interface energy barrier between the CGL and the ETL. By the capacitance-frequency (C-F) and low temperature current density-voltage (J-V) characteristic analysis, we confirm that the electron transport is a space-charge-limited current process with exponential trap distribution. These traps are localized states below the lowest unoccupied molecular orbital edge inside the gap and would be filled with the upward shift of the Fermi level during the n-doping process. Furthermore, both t...
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c70 c70 pentacene pentacene organic heterojunction as the Connecting Layer for high performance tandem organic light emitting diodes mechanism investigation of electron injection and transport
Journal of Applied Physics, 2017Co-Authors: Qingxun Guo, Dezhi Yang, Jiangshan Chen, Xianfeng Qiao, Tansir Ahamad, Saad M. AlshehriAbstract:A high performance tandem organic light-emitting diode (OLED) is realized by employing a C70/C70:pentacene/pentacene organic heterojunction as the efficient charge generation Layer (CGL). Not only more than two time enhancement of external quantum efficiency but also significant improvement in both power efficiency and lifetime are well achieved. The mechanism investigations find that the electron injection from the CGL to the adjacent electron transport Layer (ETL) in tandem devices is injection rate-limited due to the high interface energy barrier between the CGL and the ETL. By the capacitance-frequency (C-F) and low temperature current density-voltage (J-V) characteristic analysis, we confirm that the electron transport is a space-charge-limited current process with exponential trap distribution. These traps are localized states below the lowest unoccupied molecular orbital edge inside the gap and would be filled with the upward shift of the Fermi level during the n-doping process. Furthermore, both t...