Laser Physics Letters最新文献

{"title":"Metasurface CGH optimization for CTIS based on interior point method","authors":"Pengwei Zhou, Jiamin Zhou, Yangfan Lv","doi":"10.1088/1612-202x/ad3815","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3815","url":null,"abstract":"In the design of the Computed Tomographic Imaging Spectrometer (CTIS), in order to optimize the holographic grating and achieve better design performance, this paper proposes a novel optimization algorithm based on the Gerchberg–Saxton (GS) iterative algorithm. This algorithm combines the weighted GS algorithm with the interior point method (IPM). By introducing weight factors for phase and amplitude in the optimization process of the GS algorithm, and incorporating the actual diffraction characteristics of the holographic grating obtained from the Computer Simulation Technology Studio Suite into the IPM optimization process, a more optimized design performance is achieved. Using this algorithm, a metasurface holographic grating is designed, which can transform the input parallel light into a dispersion image of 25 diffraction orders on a focal plane array. The transmission efficiency exceeds 72%, and the root mean square error between different diffraction orders is less than 0.1. Among them, the optimization time is shortened by approximately 70% due to a significant reduction in the number of independent variables through symmetry. Through comparison, this method can further improve the uniformity of energy distribution based on the original algorithm, avoid being trapped in local extreme values, and thus enhance the overall design quality of the CTIS.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"19 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140595764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generating a maximally entangled state via a pure global noise environment","authors":"Fan-Zhen Kong, Jun-Long Zhao","doi":"10.1088/1612-202x/ad3627","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3627","url":null,"abstract":"We studied the entangling power of two pure global noises, i.e. amplitude damping noise and classic noise. The entangling power of the two-qubit amplitude damping global noise periodically oscillates with time. Additionally, the entangling power of two-qubit global classical noise increases exponentially with time. The maximum entangling power of both of them exceeds that of the perfect entanglers. Based on this, we propose the conditions for generating a maximally entangled state with global noise acting on a two-qubit separable state. Only if the two-qubit composite system, which is initially in one of those product states: <inline-formula>\u0000<tex-math><?CDATA $frac{1}{sqrt{2}}(|0rangle pm |1rangle)otimes frac{1}{sqrt{2}}(|0rangle pm |1rangle)$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mfrac><mml:mn>1</mml:mn><mml:msqrt><mml:mn>2</mml:mn></mml:msqrt></mml:mfrac><mml:mo stretchy=\"false\">(</mml:mo><mml:mrow><mml:mo stretchy=\"false\">|</mml:mo></mml:mrow><mml:mn>0</mml:mn><mml:mo fence=\"false\" stretchy=\"false\">⟩</mml:mo><mml:mo>±</mml:mo><mml:mrow><mml:mo stretchy=\"false\">|</mml:mo></mml:mrow><mml:mn>1</mml:mn><mml:mo fence=\"false\" stretchy=\"false\">⟩</mml:mo><mml:mo stretchy=\"false\">)</mml:mo><mml:mo>⊗</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:msqrt><mml:mn>2</mml:mn></mml:msqrt></mml:mfrac><mml:mo stretchy=\"false\">(</mml:mo><mml:mrow><mml:mo stretchy=\"false\">|</mml:mo></mml:mrow><mml:mn>0</mml:mn><mml:mo fence=\"false\" stretchy=\"false\">⟩</mml:mo><mml:mo>±</mml:mo><mml:mrow><mml:mo stretchy=\"false\">|</mml:mo></mml:mrow><mml:mn>1</mml:mn><mml:mo fence=\"false\" stretchy=\"false\">⟩</mml:mo><mml:mo stretchy=\"false\">)</mml:mo></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"lplad3627ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, <inline-formula>\u0000<tex-math><?CDATA $|10rangle$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mo stretchy=\"false\">|</mml:mo><mml:mn>10</mml:mn><mml:mo fence=\"false\" stretchy=\"false\">⟩</mml:mo></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"lplad3627ieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $|01rangle$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mo stretchy=\"false\">|</mml:mo><mml:mn>01</mml:mn><mml:mo fence=\"false\" stretchy=\"false\">⟩</mml:mo></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"lplad3627ieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> suffers an amplitude damping global noise, can we prepare this system in the maximally entangled state by appropriately controlling the evolution time of amplitude damping. Finally, we investigate the disentanglement of the maximum entangled Bell state using these two types of global noise. The two global noises cannot completely disentangle the Bell states <inline-formula>\u0000<tex-math><?CDATA $Phi^{pm}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msup><mml:mi mathvariant=\"normal\">Φ</mml:mi><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup>","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"45 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140595758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parameter optimization of SQCC-CVQKD based on genetic algorithm in the terahertz band","authors":"Chengji Liu, Yu Chao, Lu Wang, Changhua Zhu, Qingshan Li","doi":"10.1088/1612-202x/ad3621","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3621","url":null,"abstract":"Recently, we proposed a continuous variable quantum key distribution (CVQKD) scheme based on simultaneous quantum and classical communication (SQCC) in the terahertz (THz) band. It performs classical modulation and quantum Gaussian modulation at the same coherent pulse at the sending end, and an amplifier is used to amplify and demultiplex the signal at the receiving end. However, the previous study set parameters based on prior knowledge which has significant limitations, and as the previous study showed, parameter selection is a crucial task that directly affects the performance of the system. In this paper, we use the genetic algorithm to optimize the parameter selection, and how the different conditions influence the optimal value of parameters is also analyzed. The simulation results show that the parameter optimized with the algorithm can make the scheme achieve a higher secret key rate which greatly improves the applicability of the SQCC scheme in the THz band. This work demonstrates the effectiveness of the scheme to construct wireless quantum communication networks.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"22 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140595637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quasi-classical theory of cyclotron resonance with accounting for dissipation","authors":"S V Sazonov","doi":"10.1088/1612-202x/ad3628","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3628","url":null,"abstract":"Based on the quasi-classical version of the canonical Caldirola–Kanai quantization, non-relativistic cyclotron resonance in a dissipative medium is studied. The corresponding particle propagator in the coordinate representation is found. It is shown that the combined effect of dissipation and a constant magnetic field reduces to the suppression of the quantum properties of a charged particle. In turn, a time-varying electric field that causes cyclotron resonance does not exhibit similar properties and does not affect the uncertainties of the particle coordinates.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"69 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fine structure of polarization and optical Möbius strips topology of laser light in planar metamaterial","authors":"N Yu Kuznetsov, N N Potravkin, V A Makarov","doi":"10.1088/1612-202x/ad3622","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3622","url":null,"abstract":"It is shown that upon propagation of a plane linearly polarized harmonic wave normally incident on a planar nonlinear metamaterial whose basic cell consists of two rectangular silver plates with characteristic dimensions of hundreds of nanometers, there exists in the local field a circular polarization singularity line (<italic toggle=\"yes\">C</italic>-line) containing two regions where their segments come to each other to such small distance that it may appear as a self-intersection in the numerical experiment. We found that optical ribbons constructed around the ordinary points of these lines have the topology of Möbius ribbons, and the ribbons constructed in the possible self-intersection region of <italic toggle=\"yes\">C</italic>-lines and spanning its two segments are orientable surfaces.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"107 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inducing torque on molecular magnets via Laguerre Gaussian beams","authors":"Gang Lei, Shanzhi Li","doi":"10.1088/1612-202x/ad3623","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3623","url":null,"abstract":"This theoretical study delves into the induction of torque by light beams carrying orbital angular momentum on single-molecule magnets (SMMs). The investigation explores the impact of decay rates, detunings, and control field intensities on the generation of light-induced torque and the resulting current flow in a ring formation. The results highlight the crucial role of the control field, showcasing its efficacy as a tool to manipulate and amplify torque at different frequencies. Detuning is identified as a critical parameter influencing the shift, slope, and emergence of multiple peaks in the torque profile. The interplay between detuning, control field intensity, and decay rates introduces a control mechanism for fine-tuning torque at distinct probe frequencies. These findings underscore the potential applications of the control field and detuning as robust tools for tailored manipulation of torque in SMMs, paving the way for advancements in controlled current flow dynamics with ring structures.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"34 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photodynamic processes for water and wastewater treatment: a review","authors":"Kamila Jessie Sammarro Silva, Alessandra Ramos Lima, Lucas Danilo Dias, Matheus Garbuio, Mariana de Souza, Thaila Quatrini Correa, Kate Cristina Blanco, Edgar Aparecido Sanches, Vanderlei Salvador Bagnato, Natalia Mayumi Inada","doi":"10.1088/1612-202x/ad3438","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3438","url":null,"abstract":"Photodynamic therapy (PDT) has been widely employed in clinical applications, healthcare, and public health (e.g. cancer research, microbiological control, vector control, etc). The photodynamic action is an advanced oxidation process based on the production of reactive oxygen species (ROS) and singlet oxygen by the excitation of a photosensitizer by specific wavelengths of light in the presence of molecular oxygen. The generation of ROS, which are highly reactive, encourages the use of PDT against recalcitrant pollutants and resistant parasites, a novel approach for PDT applications. Here, we explored recent research in PDT in water and wastewater treatment, elucidating operational conditions, main targets, potentials, and constraints, considering a collection of scientific papers curated by a well-defined research strategy. Retrieved records were filtered by subjects, and data was organized into a content network. Results showed that PDT is a timely alternative to deal with emerging chemical contaminants, resistant microorganisms, and other challenges, raising opportunities for versatile applications and sustainable solutions. Advances in environmental applications of PDT may help reach the Sustainable Development Goal 6 (SDG 6), but also positively impact other SDGs.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"31 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"1.3 μm InAs/GaAs quantum-dot lasers grown on planar on-axis Si (001) substrates with high slope-efficiency and low differential resistance","authors":"Feng Lin, Jun Wang, Hao Zhai, Shuaicheng Liu, Qing Ge, Yanan Chen, Chuanjiang Liu, Kaize Mao, Hao Liu, Yiming Bai, Qi Wang, Yongqing Huang, Xiaomin Ren","doi":"10.1088/1612-202x/ad3439","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3439","url":null,"abstract":"We report electrically pumped continuous-wave (CW) InAs/GaAs quantum dot lasers monolithically grown on planar on-axis Si (001) substrates. Combining an asymmetric waveguide epitaxy structure with aluminium-free upper cladding layers and a symmetrical cathode chip structure, 1.3 <italic toggle=\"yes\">μ</italic>m band lasers with low differential resistance and high slope-efficiency have been achieved. Moreover, the optimized symmetrical cathode structure of the laser chips is used to improve the slope-efficiency by reducing the differential resistance and waste heat. The Fabry–Perot broad-stripe edge-emitting lasers with 2000 <italic toggle=\"yes\">μ</italic>m cavity length and 15 <italic toggle=\"yes\">μ</italic>m stripe width achieve a single-facet output power of 73 mW, a single-facet slope efficiency of 0.165 W A⁻¹, and a differential resistance of 1.31 Ω at ∼1.31 <italic toggle=\"yes\">μ</italic>m wavelength under CW conditions at room temperature (25 °C). Importantly, these results provide an effective strategy to achieve 1.3 <italic toggle=\"yes\">μ</italic>m wavelength band single-mode distributed feedback lasers directly on planar on-axis Si (001) substrates with high efficiency.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"52 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase-modulated single-photon router and chiral scattering between two waveguides coupled by a giant three-level atom","authors":"J X Zhou, Z H Zhu, Y Q Zhang, K K Chen, Z H Peng, Y F Chai, Z Z Xiong, L Tan","doi":"10.1088/1612-202x/ad3436","DOIUrl":"https://doi.org/10.1088/1612-202x/ad3436","url":null,"abstract":"We investigate a <italic toggle=\"yes\">T</italic>-shaped single-photon router constructed by two waveguides connected via a giant Λ-type three-level atom. Under a real-space approach, the analytical expressions of the single-photon transmission and reflection amplitudes are obtained. It is shown that a high transfer-rate routing between two waveguides can be effectively achieved by modulating the phase difference, the accumulated phase and the atom-waveguide coupling strengths, and its frequencies can be tuned with a classical driving field. Interestingly, chiral scattering and a single-photon targeted router with direction selectivity have been realized by the ideally equivalent atom-waveguide interaction. We believe that our results have potential applications in constructing optical quantum devices and designing the single-photon quantum routing using the giant-atom setup.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"56 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantum coherence and entanglement under the influence of decoherence","authors":"Wen-Yang Sun, A-Min Ding, Juan He, Jiadong Shi, Le Wang, Hui-Fang Xu, Dong Wang, Liu Ye","doi":"10.1088/1612-202x/ad2dc8","DOIUrl":"https://doi.org/10.1088/1612-202x/ad2dc8","url":null,"abstract":"In this work, we delve into the dynamic traits of the relative entropy of quantum coherence (REQC) as the quantum system interacts with the different noisy channels, drawing comparisons with entanglement (concurrence). The research results demonstrate the broader prevalence and stronger robustness of the REQC as opposed to concurrence. It’s worth noting that the bit flip channel cannot uphold a constant nonzero frozen the REQC, besides, the concurrence follows a pattern of temporary reduction to zero, followed by recovery after a certain time span. More importantly, the REQC maintains its presence consistently until reaching a critical threshold, whereas concurrence experiences completely attenuation to zero under the influence of phase damping and amplitude damping channels.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"44 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}