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Spectrally Resolved Two-Photon Interference in a Modified Hong-Ou-Mandel Interferometer

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SSRN

SSRN 2022年

作者： Li, Baihong Yuan, Boxin Chen, Changhua Xiang, Xiao Quan, Runai Dong, Ruifang Zhang, Shougang Jin, Ruibo Department of Physics Shaanxi University of Science and Technology Xi’an710021 China Key Laboratory of Time and Frequency Primary Standards National Time Service Center Chinese Academy of Sciences Xi’an710600 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

A modified Hong-Ou-Mandel(HOM) interference reveals that the two-photon interference phenomenon can be explained only by the concept of a two-photon wave packet rather than the single-photon one. However, the temporal interferogram in the modified HOM interferometer becomes flat in some cases so that no any useful information can be extracted from time-domain measurement. Here, we theoretically explore such temporal interferogram from the frequency domain and obtain the spectrally resolved interference with high visibility. The result represents a modulation for the joint spectral intensity along the directions of both frequency sum and frequency difference. This is quietly different from the cases of the spectrally resolved HOM interference and NOON state interference where the modulations happened only in one direction. Moreover, we have shown that such modulations have a potential application in generation and characterization of high-dimensional frequency entanglement. © 2022, The Authors. All rights reserved.

关键词： Interferometers

Spectrally resolved two-photon interference in a modified Hong-Ou-Mandel interferometer

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arXiv 2022年

作者： Li, Baihong Yuan, Boxin Chen, Changhua Xiang, Xiao Quan, Runai Dong, Ruifang Zhang, Shougang Jin, Rui-Bo Department of Physics Shaanxi University of Science and Technology Xi’an710021 China Key Laboratory of Time and Frequency Primary Standards National Time Service Center Chinese Academy of Sciences Xi’an710600 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

A modified Hong–Ou–Mandel (HOM) interference reveals that the two-photon interference phenomenon can be explained only by the concept of a two-photon wave packet rather than a single-photon one. However, the temporal interferogram in the modified HOM interferometer becomes flat in some cases so that no useful information can be extracted from time-domain measurement. Here, we theoretically explore such temporal interferogram from the frequency domain and obtain the spectrally resolved interference with high visibility. The result represents a modulation of the joint spectral intensity along both the frequency sum and the frequency difference directions. This is quite different from the cases of the spectrally resolved HOM interference and N00N state interference where the modulations happened only in one direction. Moreover, we have shown that such modulations have a potential application in the generation and characterization of high-dimensional frequency entanglement. © 2022, CC BY.

关键词： Interferometers

Identification of diffracted vortex beams at different propagation distances using deep learning

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arXiv 2022年

作者： Lv, Heng Guo, Yan Yang, Zi-Xiang Ding, Chunling Cai, Wu-Hao You, Chenglong Jin, Rui-Bo Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Quantum Photonics Laboratory Department of Physics and Astronomy Louisiana State University Baton RougeLA United States Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen China

Orbital angular momentum of light is regarded as a valuable resource in quantum technology, especially in quantum communication and quantum sensing and ranging. However, the OAM state of light is susceptible to undesirable experimental conditions such as propagation distance and phase distortions, which hinders the potential for the realistic implementation of relevant technologies. In this article, we exploit an enhanced deep learning neural network to identify different OAM modes of light at multiple propagation distances with phase distortions. Specifically, our trained deep learning neural network can efficiently identify the vortex beam’s topological charge and propagation distance with 97% accuracy. Our technique has important implications for OAM based communication and sensing protocols. © 2022, CC BY.

关键词： Vortex flow

Strong field induced electron density tide in high harmonic generation from solids

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arXiv 2020年

作者： Li, Liang Zhang, Yinfu Lan, Pengfei Huang, Tengfei Zhu, Xiaosong Zhai, Chunyang Yang, Ke He, Lixin Zhang, Qingbin Cao, Wei Lu, Peixiang Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

In strong laser fields, the electron density in solids can show up tidal motions caused by the laser "pulling" on the electrons, which forms an electron density tide (EDT). However, the strong field processes in solids are always explained by the single-active-electron (SAE) model and the fluctuation of background electrons is neglected previously. Here, we demonstrate the strong field induced EDT effect and propose a model for revealing its role in high harmoinc generation (HHG) from solids. We show that the EDT effect induces an additional polarization current beyond the SAE approximation. It gives a new mechanism for HHG and leads to new anisotropic structures, which are experimentally observed with MgO. Our experiment indicates that the EDT effect becomes more obvious with increasing the laser intensity. Our work establishes the bridge between the HHG and the microscopic EDT in solids induced by the strong laser field, which paves the way to probe the ultrafast electron dynamics. Copyright © 2020, The Authors. All rights reserved.

关键词： Electrons

Real-time exciton-manipulation of plexcitonic coupling in a ws2-ag nanocavity

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arXiv 2020年

作者： Han, Xiaobo Wang, Kai Jiang, Yanan Xing, Xiangyuan Li, Shujin Li, Fang Liu, Weiwei Wang, Bing Lu, Peixiang Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan430074 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

We demonstrate the real-time exciton-manipulation of plexcitonic coupling in monolayer WS2 coupled to a plasmonic nanocavity by immersing into a mixed solution of dichloromethane (DCM) and ethanol. By adjusting the mixture ratio, a continuous tuning of the Rabi splitting energy ranged from 178 meV (in ethanol) to 266 meV (in DCM) is achieved. The results are mainly attributed to the remarkable increase of the neutral exciton density in monolayer WS2 as the concentration of DCM is increased. It offers an important stepping stone towards a further study on plexcitonic coupling in layered materials, along with potential applications in quantum information processing and nonlinear optical materials. Copyright © 2020, The Authors. All rights reserved.

关键词： Tungsten compounds

Broad-Spectrum Light Absorption and Efficient Charge Transfer in Plasmonic Pbs/Cu2-Xs/Cds Polyhedral Heterojunction for Improved Photothermal/Photocatalytic Performance

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SSRN

SSRN 2023年

作者： Zhao, Wen-Qin Liu, Yang Zheng, Zi-Xing Ma, Liang Xiong, Kuang-Wei Chen, Xiang-Bai Wang, Qu-Quan Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Department of Physics East China Jiaotong University Nanchang330013 China School of Science Department of Physics Southern University of Science and Technology Shenzhen518055 China

The multidimensional structure, abilities of light-harvesting and charge-transfer, photothermal conversion of semiconductor heterojunction are very important characters for high-performance photocatalysis. However, it remains a challenge to rationally design heterojunction photocatalyst that meets the demand. Herein, plasmonic PbS/Cu2-xS/CdS polyhedral heterojunctions, which Cu2-xS and CdS nanoparticles are deposited on the 24-faceted PbS, are prepared for efficient photothermal-assisted photocatalysis for the first time. Owing to the synergistic effect of plasmonic resonance and bandgap excitations, the ternary hybrids display excellent light absorption ranging from ultraviolet to near-infrared (NIR) region. The unique polyhedral structure and rough surface of the hybrids generate a large surface area, offering abundant active sites for catalytic reaction. Importantly, the different work functions and appropriate band arrangements of the three semiconductors provide a double Z-scheme band structure, which leads to efficient charge transfer and separation driven by built-in electric fields. Moreover, the fast hot electron injection from plasmonic Cu2-xS to PbS and CdS also provides energetic electrons for photocatalysis. As a result, the polyhedral hybrids display efficient photocatalytic H2 activity (24.3 times of pure CdS) under visible light irradiation and a high apparent quantum efficiency under NIR light irradiation. Furthermore, the ternary hybrids show excellent photothermal conversion and photothermal-assisted photocatalysis due to plasmonic heating and nonradiative relaxation. The temperature-dependent photocatalytic tests indicate that the photothermal effect has about 35% enhancement on photocatalysis. This work provides an inspiration to develop new functional materials for the field of solar-driven energy conversion. © 2023, The Authors. All rights reserved.

关键词： Light absorption

High Harmonic Generation in Solids: Particle and Wave Perspectives

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arXiv 2023年

作者： Li, Liang Lan, Pengfei Zhu, Xiaosong Lu, Peixiang Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

High harmonic generation (HHG) from gas phase atoms (or molecules) has opened up a new frontier in ultrafast optics, where attosecond time resolution and Angstrom spatial resolution are accessible. The fundamental physical pictures of HHG is always explained by the laser-induced recollision of particle-like electron motion, which lay the foundation of attosecond spectroscopy. In recent years, HHG has also been observed in solids. One can expect the extension of attosecond spectroscopy to the condensed matter if a description capable of resolving ultrafast dynamics is provided. Thus, a large number of theoretical studies have been proposed to understand the underlying physics of HHG. Here, we revisit the recollision picture in solid HHG and show some challenges of current methods with particle perspective, and present the recently developed wave perspective Huygens-Fresnel picture in understanding dynamical systems within the ambit of strong-field physics. © 2023, CC BY.

关键词： Dynamical systems

Fast Marine Route Planning for UAV Using Improved Sparse A* Algorithm

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Fast Marine Route Planning for UAV Using Improved Sparse A* ...

International Conference on Genetic and Evolutionary Computing (ICGEC)

作者： Xin Yang Ming-yue Ding Cheng-ping Zhou Institute for Pattern Recognition and Artificial Intelligence (IPRAI) Image Processing and Intelligence Control Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Wuhan Hubei China School of Life Science and Technology Image Processing and Intelligence Control Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Wuhan Hubei China Institute for Pattern Recognition and Artificial Intelligence (IPRAI) State Key Laboratory for Multispectral Information Processing Technologies Huazhong University of Science and Technology Wuhan Hubei China

This paper focuses on route planning, especially for unmanned aircrafts in marine environment. Firstly, new heuristic information is adopted such as threat-zone, turn maneuver and forbid-zone based on voyage heuristic information. Then, the cost function is normalized to obtain more flexible and reasonable routes. Finally, an improved sparse A* search algorithm is employed to enhance the planning efficiency and reduce the planning time. Experiment results showed that the improved algorithm for aircraft in maritime environment could find a combinational optimum route quickly, which detoured threat-zones, with fewer turn maneuver, totally avoiding forbid-zones, and shorter voyage.

关键词： Unmanned aerial vehicles Planning Synthetic aperture sonar Cost function Algorithm design and analysis Heuristic algorithms Leg

Fingerprint of the interbond electron hopping in second-order harmonic generation

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arXiv 2020年

作者： Li, Liang Huang, Tengfei Lan, Pengfei Li, Jiapeng Zhang, Yinfu Zhu, Xiaosong He, Lixin Cao, Wei Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

We experimentally explore the fingerprint of the microscopic electron dynamics in second-order harmonic generation (SHG). It is shown that the interbond electron hopping induces a novel source of nonlinear polarization and plays an important role even when the driving laser intensity is two orders of magnitude lower than the characteristic atomic field. Our model predicts distinct anisotropic structures of the SHG yield contributed by the interbond electron hopping, which is identified in our experiments with ZnO crystals. Moreover, a generalized second-order susceptibility with an explicit form is proposed, which provides a unified description in both the perturbative and strong field regimes. Our work reveals the nonlinear responses of materials at the electron scale and extends the perturbation nonlinear optics to a previously unexplored regime, where the nonlinearity related to the interbond electron hopping becomes dominant. It paves the way for realizing controllable nonlinearity on ultrafast time scale. Copyright © 2020, The Authors. All rights reserved.

关键词： Harmonic generation