Journal of The Optical Society of America B-optical Physics最新文献_第9页

Self-consistent description of relaxation processes in systems with ultra- and deep-strong coupling 超强和深强耦合系统松弛过程的自洽描述

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-10-03 DOI: 10.1364/josab.501199

Timofey Sergeev, Alexander Zyablovsky, E. Andrianov, Yurii Lozovik

{"title":"Self-consistent description of relaxation processes in systems with ultra- and deep-strong coupling","authors":"Timofey Sergeev, Alexander Zyablovsky, E. Andrianov, Yurii Lozovik","doi":"10.1364/josab.501199","DOIUrl":"https://doi.org/10.1364/josab.501199","url":null,"abstract":"An ultra-strong coupling regime takes place in a compound system when a coupling strength between the subsystems exceeds one-tenth of the system eigenfrequency. It transforms into a deep-strong coupling regime when the coupling strength exceeds the system eigenfrequency. In these regimes, there are difficulties with the description of relaxation processes without explicit consideration of environmental degrees of freedom. To correctly evaluate the relaxation rates, it is necessary to consider the interaction of the system with its environment taking into account the counter-rotating wave and diamagnetic terms. We develop a self-consistent theory for the calculation of the relaxation rates in the systems, in which the coupling strength is of the order of the system eigenfrequency. We demonstrate that the increase in the coupling strength can lead to a significant decrease in the relaxation rates. In particular, we show that, for frequency-independent density of states of the environment, the relaxation rates decrease exponentially with the increase in the coupling strength. This fact can be used to suppress losses by tuning the strength coupling and the environment states.","PeriodicalId":17280,"journal":{"name":"Journal of The Optical Society of America B-optical Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135647980","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}

引用次数: 0

Optimization of p-i-n GaAs/AlGaAs Heterojunction Nanowire Solar Cell for Improved Optical and Electrical Properties p-i-n GaAs/AlGaAs异质结纳米线太阳能电池光电性能优化研究

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-29 DOI: 10.1364/josab.492196

Sambuddha Majumder, Krishnanunni A, Sooraj Ravindran

{"title":"Optimization of p-i-n GaAs/AlGaAs Heterojunction Nanowire Solar Cell for Improved Optical and Electrical Properties","authors":"Sambuddha Majumder, Krishnanunni A, Sooraj Ravindran","doi":"10.1364/josab.492196","DOIUrl":"https://doi.org/10.1364/josab.492196","url":null,"abstract":"GaAs/AlGaAs based nanowires are promising candidates for photovoltaic applications due to their high absorption coefficient, low surface reflection, and efficient collection of photogenerated carriers. This study focuses on optimizing the performance of p-i-n GaAs/AlGaAs nanowire solar cell arrays having a radial junction using optoelectronic simulations. The research investigates the optimal doping for the GaAs core and AlGaAs shell, as well as the impact of shell thickness and junction positions on solar cell performance. Additionally, the study examines the effect of various surface effects, including the presence of surface traps, surface recombination velocities, and associated lifetime degradation. Our studies find that a high doping density for the shell and core region is crucial for achieving an appropriate band configuration and carrier extraction. It also highlights that having a larger doping density is more important than having a larger lifetime. Finally, the research examines the effect of different aluminum compositions on photogeneration inside the nanowire and shows that having a high aluminum composition can confine most photogeneration to inner GaAs regions, potentially allowing for thicker AlGaAs shells, which can efficiently prevent surface recombination.","PeriodicalId":17280,"journal":{"name":"Journal of The Optical Society of America B-optical Physics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135132144","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}

引用次数: 0

Properties of the Hermite-Gaussian beams via the quantum potential 厄米高斯光束通过量子势的性质

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-29 DOI: 10.1364/josab.499272

Gilberto Silva-Ortigoza, Ernesto Ramos, EDNA GOCHICOA-FUENTES, Ramón Silva-Ortigoza

{"title":"Properties of the Hermite-Gaussian beams via the quantum potential","authors":"Gilberto Silva-Ortigoza, Ernesto Ramos, EDNA GOCHICOA-FUENTES, Ramón Silva-Ortigoza","doi":"10.1364/josab.499272","DOIUrl":"https://doi.org/10.1364/josab.499272","url":null,"abstract":"In this work we compute, via the quantum potential approach, the Hamiltonian system determined by Hermite–Gaussian beams. Then we show that the integral curves of the Poynting vector, exact optics energy trajectories, conform to a subset of solutions to the corresponding Hamilton equations lying on hyperboloidal surfaces. The geometrical light rays associated with these beams are given by the tangent lines to the integral curves of the Poynting vector at the zeroes of the quantum potential, and the caustic region coincides with the zeroes of quantum potential and quantum force. One of the main contributions of this work is to present the relationship between the physical phase k Φ, the geometrical-optics phase k Φ G , and the quantum potential Q HG in the Hermite–Gaussian beams. Furthermore, note that for any solution to the paraxial wave equation in free space, the tangent lines to the integral curves of the Poynting vector that correspond to the geometric light rays are those that pass through the points where the region determined by zeroes of the quantum potential is tangent to the geometrical caustic determined by the geometric light rays .","PeriodicalId":17280,"journal":{"name":"Journal of The Optical Society of America B-optical Physics","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135131848","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}

引用次数: 0

Damage, waveguide and electrical properties in (La, Sr)(Al, Ta)O3 single crystal irradiated with carbon ions 碳离子辐照下(La, Sr)(Al, Ta)O3单晶的损伤、波导和电学性质

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-29 DOI: 10.1364/josab.501291

Mei Qiao, Tie-Jun Wang, Yong Liu, Tao Liu, Zhenxing Wang, Wanling Cui, Xiaoxin Wang, Xin Li, shicai xu

引用次数: 0

Predicting Refractive Index of Thin-Film Alloys by Extension from the Main Metal 用主金属引申法预测薄膜合金折射率

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-29 DOI: 10.1364/josab.497825

Guowen Ding, Tevin Ding, Daniel Lin

引用次数: 0

Accurate inverse design for high-efficiency and broadband terahertz devices by co-simulation with genetic algorithms 基于遗传算法联合仿真的高效宽带太赫兹器件精确反设计

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-27 DOI: 10.1364/josab.496383

Ming Zhang, Junyao Zhang, Ming Cui, Peng Dong, Baozhu Wang, Lin Yang, Xiuqing Zhang

引用次数: 0

Free-induction-decay magnetometer with enhanced optical pumping 具有增强光泵浦的自由感应衰减磁强计

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-27 DOI: 10.1364/josab.501086

Dominic Hunter, Marcin Mrozowski, Allan McWilliam, Stuart Ingleby, Terry Dyer, Paul Griffin, Erling Riis

{"title":"Free-induction-decay magnetometer with enhanced optical pumping","authors":"Dominic Hunter, Marcin Mrozowski, Allan McWilliam, Stuart Ingleby, Terry Dyer, Paul Griffin, Erling Riis","doi":"10.1364/josab.501086","DOIUrl":"https://doi.org/10.1364/josab.501086","url":null,"abstract":"Spin preparation prior to a free-induction-decay (FID) measurement can be adversely affected by transverse bias fields, particularly in the geophysical field range. A strategy that enhances the spin polarization accumulated before readout is demonstrated, by synchronizing optical pumping with a magnetic field pulse that supersedes any transverse fields by over two orders of magnitude. The pulsed magnetic field is generated along the optical pumping axis using a compact electromagnetic coil pair encompassing a micro-electromechanical systems (MEMS) vapor cell. The coils also resistively heat the cesium vapor to the optimal atomic density without spurious magnetic field contributions as they are rapidly demagnetized to approximately zero field during spin readout. The demagnetization process is analyzed electronically, and directly with a FID measurement, to confirm that the residual magnetic field is minimal during detection. The sensitivity performance of this technique is compared to existing optical pumping modalities across a wide magnetic field range. A noise floor sensitivity of 238fT/Hz was achieved in a field of approximately 50 µT, in close agreement with the Cramér–Rao lower bound predicted noise density of 258fT/Hz.","PeriodicalId":17280,"journal":{"name":"Journal of The Optical Society of America B-optical Physics","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477027","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}

引用次数: 0

Butterfly-shaped and dromion-like optical similaritons in asymmetric twin-core fiber amplifier 非对称双芯光纤放大器中蝴蝶形和子形光学相似性

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-27 DOI: 10.1364/josab.501345

Soloman Thokala, Ashwin Myakalwar

{"title":"Butterfly-shaped and dromion-like optical similaritons in asymmetric twin-core fiber amplifier","authors":"Soloman Thokala, Ashwin Myakalwar","doi":"10.1364/josab.501345","DOIUrl":"https://doi.org/10.1364/josab.501345","url":null,"abstract":"Butterfly-shaped and dromion-like optical waves in a tapered graded-index waveguide (GRIN) with an external source are reported for the first time, to our knowledge. More pertinently, we obtain these waves both analytically and numerically in a generalized nonlinear Schrödinger equation (GNLSE), which describes self-similar wave propagation in GRIN with variable group-velocity dispersion (GVD), nonlinearity, gain, and source. The proposed GNLSE appertains to the study of similariton propagation through asymmetric twin-core fiber amplifiers. Dromion-like structures, which have generally been investigated in the (2+1) or higher dimensional systems, are reported in the (1+1) dimensional GNLSE with an external source. Herein, we introduce the concept of soliton management when the variable group-velocity dispersion and Kerr nonlinearity functions are suggested. For example, when the GVD parameter is perturbed, we observe the emergence of vibration of dromion-like structures. Then the dromion-like structure is transformed into oscillation by the modulation instability of the modified coefficient of the Gaussian GVD function, exhibiting interference based on two dromion-like structures. Additionally, the phenomenon of unbreakable P T symmetry of these nonlinear waves has been demonstrated for three explicit examples.","PeriodicalId":17280,"journal":{"name":"Journal of The Optical Society of America B-optical Physics","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477759","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}

引用次数: 0

A Review of Diffractive Deep Neural Networks 衍射深度神经网络研究进展

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-27 DOI: 10.1364/josab.497148

Yichen Sun, mingli dong, Mingxin Yu, xiaolin liu, Lianqing Zhu

引用次数: 0

Ultrawide tunable terahertz phase shifter based on double-layer liquid crystal-dielectric grating 基于双层液晶-介质光栅的超宽可调谐太赫兹移相器

4区物理与天体物理

Journal of The Optical Society of America B-optical Physics Pub Date : 2023-09-25 DOI: 10.1364/josab.497577

Songlin Jiang, Fei Fan, Yun-Yun Ji, Huijun Zhao, Jie -Rong Cheng, Xianghui Wang, Shengjiang Chang

{"title":"Ultrawide tunable terahertz phase shifter based on double-layer liquid crystal-dielectric grating","authors":"Songlin Jiang, Fei Fan, Yun-Yun Ji, Huijun Zhao, Jie -Rong Cheng, Xianghui Wang, Shengjiang Chang","doi":"10.1364/josab.497577","DOIUrl":"https://doi.org/10.1364/josab.497577","url":null,"abstract":"The ultrawide tunable terahertz (THz) phase shifter has always been in high demand by THz applications, especially in terms of broadband transmission and phase modulation. In this paper, we design and fabricate a composite device that combines a double-layer liquid crystal (LC) with a double-sided etched grating metasurface. By introducing the natural anisotropy of LC based on the artificial anisotropy of the metasurface, the anisotropy of the device is significantly enhanced, and this anisotropy can be dynamically modulated by an external field. When the LC molecules rotate in the x − y plane, the experimental results show that the phase difference can vary between −83 ∘ and 277° at 0.52 THz with a large phase-shift modulation depth of 360° (i.e., 2 π ). The same phase-shift modulation depth can be obtained when the LC molecules rotate in the x − z plane, in which the phase difference can vary between 207° and 567° at 1.14 THz. Our proposed composite device shows an ultrawide phase shift regulation and an ultra-large phase-shift modulation depth in the THz regime, which may provide a new strategy for various THz phase and polarization devices.","PeriodicalId":17280,"journal":{"name":"Journal of The Optical Society of America B-optical Physics","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769281","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}

引用次数: 0