The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Marvin G. Payne - One of the best experts on this subject based on the ideXlab platform.
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Observation of quantum Destructive Interference in inelastic two-wave mixing.
Physical review letters, 2007Co-Authors: Kaijun Jiang, Lu Deng, Marvin G. PayneAbstract:Using room-temperature Rb-87 atoms we demonstrate a quantum Destructive Interference between two one-photon excitation pathways in an inelastic two-wave mixing scheme that corresponds to the "strong-storage and weak-retrieval" of an optical field. This Destructive Interference is fundamentally different from the usual electromagnetically induced transparency because it is critically dependent on the generation and propagation of a wave-mixing field. We also show that contrary to the common belief, the maximum atomic coherence in general does not lead to the maximum mixing-wave conversion efficiency.
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Achieving induced transparency with one- and three-photon Destructive Interference in a two-mode, three-level, double- Λ system
Physical Review A, 2005Co-Authors: Lu Deng, Marvin G. PayneAbstract:We show that in a two-mode, three-level, double-{lambda} system an efficient multiphoton Destructive Interference involving one- and three-photon pumping pathways occurs, leading to a unique type of induced transparency. Unlike the conventional electromagnetically induced transparency achieved with a three-state {lambda} system, the induced transparency is critically dependent upon two distinctive relaxation processes involving the production and propagation of an internally generated field. When a two-mode probe field is injected under suitable conditions, we show that the two probe pulses, after a characteristic propagation distance, evolve into a pair of temporal, amplitude, and group velocity matched pulse, traveling loss free in a highly dispersive medium.
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Efficient multiwave mixing in the ultraslow propagation regime and the role of multiphoton quantum Destructive Interference.
Optics letters, 2004Co-Authors: Marvin G. Payne, Edward W. Hagley, Lu DengAbstract:We analyze a lifetime-broadened four-state four-wave-mixing (FWM) scheme in the ultraslow propagation regime and show that the generated FWM field can acquire the same group velocity and pulse shape as those of an ultraslow pump field. We show that a new type of induced transparency resulted from multiphoton Destructive Interference that significantly reduced the pump field loss. Such induced transparency based on multphoton Destructive Interference may have important applications in other nonlinear optical processes.
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Inelastic wave mixing and multi-photon Destructive Interference based induced transparency in coherently prepared media
Optics Communications, 2004Co-Authors: Lu Deng, Marvin G. Payne, W. R. GarrettAbstract:We consider a multi-level medium initially prepared with a coherent superposition of two initial levels that are not directly dipole-coupled. We study the production of multi-wave mixing in the coherent medium, where the process begins on one and terminates on the other of the two prepared levels. We find that a new type of wave mixing field can be efficiently generated in such a system with characteristics of both conventional four-wave mixing and stimulated hyper-Raman emission. We also show that two multi-photon Destructive Interferences build up simultaneously, leading to simultaneous reduction of the attenuation of the pump and wave-mixing fields. As a consequence a pair of ultra slow, temporally and group-velocity matched pump and wave-mixing fields can be generated. This type of multi-photon induced transparency and its consequences are qualitatively different from the conventional EIT where the Destructive Interference occurs between two single photon channels.
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Inhibiting the onset of the three-photon Destructive Interference in ultraslow propagation-enhanced four-wave mixing with dual induced transparency.
Physical review letters, 2003Co-Authors: Lu Deng, Marvin G. PayneAbstract:We propose a dual electromagnetically induced transparency (EIT) based multiwave mixing scheme that retains the significantly enhanced conversion efficiency enabled by ultraslow propagation of pump waves, yet is also capable of inhibiting and delaying the onset of the detrimental three-photon Destructive Interference that limits the further growth of the four-wave mixing (FWM) field. We show that the new scheme exhibits a wave-matching condition that is fundamentally different from the conventional FWM without EIT, and the efficient generation of the mixing wave is not critically dependent upon the FWM detuning to achieve constructive Interference as required in the conventional FWM. These are significant steps forward in enabling applications of ultraslow wave nonlinear optics.
Lu Deng - One of the best experts on this subject based on the ideXlab platform.
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Observation of quantum Destructive Interference in inelastic two-wave mixing.
Physical review letters, 2007Co-Authors: Kaijun Jiang, Lu Deng, Marvin G. PayneAbstract:Using room-temperature Rb-87 atoms we demonstrate a quantum Destructive Interference between two one-photon excitation pathways in an inelastic two-wave mixing scheme that corresponds to the "strong-storage and weak-retrieval" of an optical field. This Destructive Interference is fundamentally different from the usual electromagnetically induced transparency because it is critically dependent on the generation and propagation of a wave-mixing field. We also show that contrary to the common belief, the maximum atomic coherence in general does not lead to the maximum mixing-wave conversion efficiency.
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Achieving induced transparency with one- and three-photon Destructive Interference in a two-mode, three-level, double- Λ system
Physical Review A, 2005Co-Authors: Lu Deng, Marvin G. PayneAbstract:We show that in a two-mode, three-level, double-{lambda} system an efficient multiphoton Destructive Interference involving one- and three-photon pumping pathways occurs, leading to a unique type of induced transparency. Unlike the conventional electromagnetically induced transparency achieved with a three-state {lambda} system, the induced transparency is critically dependent upon two distinctive relaxation processes involving the production and propagation of an internally generated field. When a two-mode probe field is injected under suitable conditions, we show that the two probe pulses, after a characteristic propagation distance, evolve into a pair of temporal, amplitude, and group velocity matched pulse, traveling loss free in a highly dispersive medium.
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Efficient multiwave mixing in the ultraslow propagation regime and the role of multiphoton quantum Destructive Interference.
Optics letters, 2004Co-Authors: Marvin G. Payne, Edward W. Hagley, Lu DengAbstract:We analyze a lifetime-broadened four-state four-wave-mixing (FWM) scheme in the ultraslow propagation regime and show that the generated FWM field can acquire the same group velocity and pulse shape as those of an ultraslow pump field. We show that a new type of induced transparency resulted from multiphoton Destructive Interference that significantly reduced the pump field loss. Such induced transparency based on multphoton Destructive Interference may have important applications in other nonlinear optical processes.
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Inelastic wave mixing and multi-photon Destructive Interference based induced transparency in coherently prepared media
Optics Communications, 2004Co-Authors: Lu Deng, Marvin G. Payne, W. R. GarrettAbstract:We consider a multi-level medium initially prepared with a coherent superposition of two initial levels that are not directly dipole-coupled. We study the production of multi-wave mixing in the coherent medium, where the process begins on one and terminates on the other of the two prepared levels. We find that a new type of wave mixing field can be efficiently generated in such a system with characteristics of both conventional four-wave mixing and stimulated hyper-Raman emission. We also show that two multi-photon Destructive Interferences build up simultaneously, leading to simultaneous reduction of the attenuation of the pump and wave-mixing fields. As a consequence a pair of ultra slow, temporally and group-velocity matched pump and wave-mixing fields can be generated. This type of multi-photon induced transparency and its consequences are qualitatively different from the conventional EIT where the Destructive Interference occurs between two single photon channels.
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Inhibiting the onset of the three-photon Destructive Interference in ultraslow propagation-enhanced four-wave mixing with dual induced transparency.
Physical review letters, 2003Co-Authors: Lu Deng, Marvin G. PayneAbstract:We propose a dual electromagnetically induced transparency (EIT) based multiwave mixing scheme that retains the significantly enhanced conversion efficiency enabled by ultraslow propagation of pump waves, yet is also capable of inhibiting and delaying the onset of the detrimental three-photon Destructive Interference that limits the further growth of the four-wave mixing (FWM) field. We show that the new scheme exhibits a wave-matching condition that is fundamentally different from the conventional FWM without EIT, and the efficient generation of the mixing wave is not critically dependent upon the FWM detuning to achieve constructive Interference as required in the conventional FWM. These are significant steps forward in enabling applications of ultraslow wave nonlinear optics.
Yonathan Dattner - One of the best experts on this subject based on the ideXlab platform.
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analysis of the effective refractive index of silicon waveguides through the constructive and Destructive Interference in a mach zehnder interferometer
IEEE Photonics Journal, 2011Co-Authors: Yonathan Dattner, Orly YadidpechtAbstract:This paper introduces a method of measuring the delta between the effective refractive index of a silicon waveguide and a waveguide with wider dimensions through the constructive and Destructive Interference in a Mach-Zehnder interferometer (MZI). The method consists of a fixed effective refractive index variation incorporated by tapering one of the arms in the interferometer to a wider waveguide dimension. The MZI consists of a Y-branch splitter and a multimode Interference (MMI) coupler. The Y-branch splitter splits the input light 50/50 into the two arms, and the MMI is used for recombination of the two arms. A change in the effective refractive index of one arm in comparison with the other arm in the interferometer will introduce a phase difference on recombination in the MMI. The MMI has the following three ports: the top and bottom output ports, which are the antisymmetric outputs, and the middle port, which is the symmetric output. When the two signals are in phase, all the light is coupled into the symmetric port, and when the two inputs are π out of phase, the light is coupled 50/50 into the antisymmetric ports. The interferometer is designed on a silicon-on-insulator (SOI) wafer and fabricated through IMEC Belgium. Theoretical, simulation, and measured results are presented and compared.
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Analysis of the Effective Refractive Index of Silicon Waveguides Through the Constructive and Destructive Interference in a Mach–Zehnder Interferometer
IEEE Photonics Journal, 2011Co-Authors: Yonathan Dattner, Orly Yadid-pechtAbstract:This paper introduces a method of measuring the delta between the effective refractive index of a silicon waveguide and a waveguide with wider dimensions through the constructive and Destructive Interference in a Mach-Zehnder interferometer (MZI). The method consists of a fixed effective refractive index variation incorporated by tapering one of the arms in the interferometer to a wider waveguide dimension. The MZI consists of a Y-branch splitter and a multimode Interference (MMI) coupler. The Y-branch splitter splits the input light 50/50 into the two arms, and the MMI is used for recombination of the two arms. A change in the effective refractive index of one arm in comparison with the other arm in the interferometer will introduce a phase difference on recombination in the MMI. The MMI has the following three ports: the top and bottom output ports, which are the antisymmetric outputs, and the middle port, which is the symmetric output. When the two signals are in phase, all the light is coupled into the symmetric port, and when the two inputs are π out of phase, the light is coupled 50/50 into the antisymmetric ports. The interferometer is designed on a silicon-on-insulator (SOI) wafer and fabricated through IMEC Belgium. Theoretical, simulation, and measured results are presented and compared.
Gemma C. Solomon - One of the best experts on this subject based on the ideXlab platform.
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The Role of Through-Space Interactions in Modulating Constructive and Destructive Interference Effects in Benzene.
Nano letters, 2017Co-Authors: Anders Borges, Jianlong Xia, Sheng Hua Liu, Latha Venkataraman, Gemma C. SolomonAbstract:Quantum Interference effects, whether constructive or Destructive, are key to predicting and understanding the electrical conductance of single molecules. Here, through theory and experiment, we investigate a family of benzene-like molecules that exhibit both constructive and Destructive Interference effects arising due to more than one contact between the molecule and each electrode. In particular, we demonstrate that the π-system of meta-coupled benzene can exhibit constructive Interference and its para-coupled analog can exhibit Destructive Interference, and vice versa, depending on the specific through-space interactions. As a peculiarity, this allows a meta-coupled benzene molecule to exhibit higher conductance than a para-coupled benzene. Our results provide design principles for molecular electronic components with high sensitivity to through-space interactions and demonstrate that increasing the number of contacts between the molecule and electrodes can both increase and decrease the conductance.
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Probing the Conductance of the σ-System of Bipyridine Using Destructive Interference.
The journal of physical chemistry letters, 2016Co-Authors: Anders Borges, Latha Venkataraman, E-dean Fung, Gemma C. SolomonAbstract:Guidelines to predict trends in the electrical conductance of molecules have been developed for the π-system of conjugated systems. Little is known, however, about the conductance of the underlying σ-systems because the π-system usually dominates the transport. Here we study a family of bipyridine-based molecules using STM-break junction experiments and density functional theory transport calculations. We use different lengths and substitution patterns to probe the role of both the σ-system and the π-system in controlling conductance. By exploiting the Destructive Interference feature found in the π-system of the meta-coupled six-membered aromatic rings, we show that the conductance of the σ-system of a meta-coupled molecule can be probed directly and can even exceed that of its para-coupled analog. These results add to the understanding of the conductance through the chemically hidden σ-electrons.
Qing Yang - One of the best experts on this subject based on the ideXlab platform.
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a non Destructive Interference based receiver initiated mac protocol for wireless sensor networks
Consumer Communications and Networking Conference, 2016Co-Authors: Ye Liu, Qi Chen, Hao Liu, Qing YangAbstract:Non-Destructive concurrent transmissions recently attract widespread attention in wireless sensor networks research community, and many studies demonstrate that non-Destructive Interference in concurrent transmissions enables routing-free packet transmission with low latency and increased reliability. In this paper, we present a new MAC protocol, called Non-Destructive Interference MAC (NDI-MAC), that integrates non-Destructive simultaneous transmissions into receiver-initiated protocols, achieving energy efficient and low latency data transmission under a variety of traffic loads. The capture effect is exploited in NDI-MAC to finish rendezvous between multiple senders and receivers. NDI-MAC also relies on triggercast, a distributed middleware to trigger synchronous packet transmissions with constructive Interference. So as to ensure single-hop reliability, backcast primitive is used under unicast traffic. Evaluation results show that NDI-MAC achieves high performance in terms of energy consumption and data delivery latency under data dissemination and collection traffic.
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CCNC - A Non Destructive Interference based receiver-initiated MAC protocol for wireless sensor networks
2016 13th IEEE Annual Consumer Communications & Networking Conference (CCNC), 2016Co-Authors: Ye Liu, Qi Chen, Hao Liu, Qing YangAbstract:Non-Destructive concurrent transmissions recently attract widespread attention in wireless sensor networks research community, and many studies demonstrate that non-Destructive Interference in concurrent transmissions enables routing-free packet transmission with low latency and increased reliability. In this paper, we present a new MAC protocol, called Non-Destructive Interference MAC (NDI-MAC), that integrates non-Destructive simultaneous transmissions into receiver-initiated protocols, achieving energy efficient and low latency data transmission under a variety of traffic loads. The capture effect is exploited in NDI-MAC to finish rendezvous between multiple senders and receivers. NDI-MAC also relies on triggercast, a distributed middleware to trigger synchronous packet transmissions with constructive Interference. So as to ensure single-hop reliability, backcast primitive is used under unicast traffic. Evaluation results show that NDI-MAC achieves high performance in terms of energy consumption and data delivery latency under data dissemination and collection traffic.