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Direct observation of Anderson localization ofultracold atoms in a quasiperiodic lattice 准周期晶格中超冷原子安德森局域化的直接观察
Optics continuum Pub Date : 2023-09-25 DOI: 10.1364/optcon.499768
Wenbo Yan, Yuqing Li, Hongxing Zhao, Jizhou Wu, Wenliang Liu, Peng Li, Yongming Fu, Liantuan Xiao, Jie Ma, Suotang Jia
{"title":"Direct observation of Anderson localization ofultracold atoms in a quasiperiodic lattice","authors":"Wenbo Yan, Yuqing Li, Hongxing Zhao, Jizhou Wu, Wenliang Liu, Peng Li, Yongming Fu, Liantuan Xiao, Jie Ma, Suotang Jia","doi":"10.1364/optcon.499768","DOIUrl":"https://doi.org/10.1364/optcon.499768","url":null,"abstract":"Ultracold atoms in quasiperiodic lattices offer a versatile platform for studying many intriguingly disorder-driven phenomena. Here we study the quantum transport of noninteracting ultracold 133 Cs atoms in a one-dimensional quasiperiodic momentum lattice, which is formed by using the laser-coupled momentum states as synthetic dimensions. Through measurements of the site-resolved density distribution of atoms in the synthetic quasiperiodic lattice, we directly observe the transition from the atomic diffusive transport to Anderson localization in the initial injection site with increasing strength of the quasiperiodic modulation. We show the dependence of momentum width characterizing the atomic expansion degree on the quasiperiodic modulation strength, and our observation is in good agreement with the theoretical calculation. Our work provides significant insights for understanding the quantum spreading in disordered systems.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"43 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":"135769609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Equalization in Dispersion-Managed SystemsUsing Learned Digital Back-Propagation 基于学习数字反向传播的分散管理系统均衡化
Optics continuum Pub Date : 2023-09-25 DOI: 10.1364/optcon.497117
Mohannad Abu-Romoh, Nelson Costa, Yves Jaouën, Antonio Napoli, João Pedro, Bernhard Spinnler, Mansoor Yousefi
{"title":"Equalization in Dispersion-Managed SystemsUsing Learned Digital Back-Propagation","authors":"Mohannad Abu-Romoh, Nelson Costa, Yves Jaouën, Antonio Napoli, João Pedro, Bernhard Spinnler, Mansoor Yousefi","doi":"10.1364/optcon.497117","DOIUrl":"https://doi.org/10.1364/optcon.497117","url":null,"abstract":"In this paper, we investigate the use of the learned digital back-propagation (LDBP) for equalizing dual-polarization fiber-optic transmission in dispersion-managed (DM) links. LDBP is a deep neural network that optimizes the parameters of DBP using the stochastic gradient descent. We evaluate DBP and LDBP in a simulated WDM dual-polarization fiber transmission system operating at 32 Gbaud/s per channel, with a dispersion map designed for a 28 × 72 km link with 15% residual dispersion. Our results show that in single-channel transmission, LDBP achieves an effective signal-to-noise ratio improvement of 6.3 dB and 2.5 dB using DP-16-QAM format, respectively, over linear equalization and DBP. In WDM transmission, the corresponding Q -factor gains are 1.1 dB and 0.4 dB, respectively. Additionally, we conduct a complexity analysis, which reveals that a frequency-domain implementation of LDBP and DBP is more favorable in terms of complexity than the time-domain implementation. These findings demonstrate the effectiveness of LDBP in mitigating the nonlinear effects in DM fiber-optic transmission systems.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"102 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":"135768597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modeling of a fiber Fabry-Pérot sensor in thebroken PT-symmetric region 光纤法布里- psamro传感器在pt对称破碎区域的建模
Optics continuum Pub Date : 2023-09-25 DOI: 10.1364/optcon.499236
Faiza Iftikhar, Raja Ahmad, Imran Cheema
{"title":"Modeling of a fiber Fabry-Pérot sensor in thebroken PT-symmetric region","authors":"Faiza Iftikhar, Raja Ahmad, Imran Cheema","doi":"10.1364/optcon.499236","DOIUrl":"https://doi.org/10.1364/optcon.499236","url":null,"abstract":"Parity-time (PT)-symmetric optical sensors operating around exceptional points have recently gained much attraction due to their improved sensitivity for measuring small perturbations. Previously, most of the PT-symmetric sensors have been based on detecting the mode splitting that arises due to the perturbation-induced change in coupling strength between two sub-cavities of the PT-symmetric system. Here, we present a model of a fiber Fabry-Pérot linear cavities sensor tailored to operate in the broken parity-time symmetric region. We propose, what we believe to be, a new sensing metric based on the mode’s linewidth change as a function of perturbation-induced loss changes in one of the cavities. The coupling strength between the two sub-cavities remains unchanged in our proposed sensor. We derive a mathematical expression that describes a square root dependence of the full-width-half-maximum change as a function of the refractive index change-induced loss, which is introduced via a tapered fiber in one of the fiber cavities. The proposed fiber Fabry-Pérot refractive index sensor has a maximum sensitivity of 2.26 × 10 7 GHz/RIU and the lowest detection limit of 10 −9 RIU, widely outperforming comparable cavity sensors subject to the same refractive index change, gain, and loss settings.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"36 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":"135769284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Steady-state entanglement in a hybrid optomechanical system enhanced by optical parametric amplifiers 光参量放大器增强的混合光-机械系统的稳态纠缠
Optics continuum Pub Date : 2023-09-07 DOI: 10.1364/optcon.502349
Abraham Kibret, T. Darge, Tesfaye Gebremariam
{"title":"Steady-state entanglement in a hybrid optomechanical system enhanced by optical parametric amplifiers","authors":"Abraham Kibret, T. Darge, Tesfaye Gebremariam","doi":"10.1364/optcon.502349","DOIUrl":"https://doi.org/10.1364/optcon.502349","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41829418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical levitation in high vacuum using a 0.9-numerical-aperture lens 使用0.9数值孔径透镜的高真空光学悬浮
Optics continuum Pub Date : 2023-09-07 DOI: 10.1364/optcon.501654
Mayu Tanaka, Shota Suetomo, Nao Osato, Seiya Shinkawa, Feng-Lei Hong, Daisuke Akamatsu
{"title":"Optical levitation in high vacuum using a 0.9-numerical-aperture lens","authors":"Mayu Tanaka, Shota Suetomo, Nao Osato, Seiya Shinkawa, Feng-Lei Hong, Daisuke Akamatsu","doi":"10.1364/optcon.501654","DOIUrl":"https://doi.org/10.1364/optcon.501654","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41335628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
End-to-end Algorithm for Automatic Detection of Neural Canal Opening in OCT Images Based on Multi-task Deep Learning Model 基于多任务深度学习模型的OCT图像神经管开口自动检测端到端算法
Optics continuum Pub Date : 2023-09-06 DOI: 10.1364/optcon.497631
Chieh-En Lee, Jia-Ling Tu, Pei-Chia Tsai, Yu-Chieh Ko, Shih-Jen Chen, Ying-Shan Chen, Chu-Ming Cheng, Chung-Hao Tien
{"title":"End-to-end Algorithm for Automatic Detection of Neural Canal Opening in OCT Images Based on Multi-task Deep Learning Model","authors":"Chieh-En Lee, Jia-Ling Tu, Pei-Chia Tsai, Yu-Chieh Ko, Shih-Jen Chen, Ying-Shan Chen, Chu-Ming Cheng, Chung-Hao Tien","doi":"10.1364/optcon.497631","DOIUrl":"https://doi.org/10.1364/optcon.497631","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48397224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
LED-based Schlieren system for full-field photoacoustic wave acquisition and image reconstruction 基于led的纹影系统全场光声波采集与图像重建
Optics continuum Pub Date : 2023-09-06 DOI: 10.1364/optcon.498143
Yanier Ojeda-Morales, Danay Hernandez-Lopez, Geminiano Martinez-Ponce
{"title":"LED-based Schlieren system for full-field photoacoustic wave acquisition and image reconstruction","authors":"Yanier Ojeda-Morales, Danay Hernandez-Lopez, Geminiano Martinez-Ponce","doi":"10.1364/optcon.498143","DOIUrl":"https://doi.org/10.1364/optcon.498143","url":null,"abstract":"In this work, full-field detection of laser-induced ultrasound waves was performed with an off-axis LED-based Schlieren system. Sensing strobe light, pulsed laser dual light-sheet excitation, and CMOS sensor device were all synchronized to capture the pressure wave as it propagated through an elastic liquid surrounding the test sample. In addition, a reconstruction algorithm based on the Radon transform was applied to the digitally recorded field in order to obtain an image of the photoacoustic source. The proposed system is capable of retrieving the profile of cylindrical and hexagonal targets.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135098517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Backward multiplex coherent anti-Stokes Raman (CARS) spectroscopic imaging with electron-multiplying CCD (EMCCD) camera 用电子倍增CCD（EMCCD）相机进行反向多重相干反斯托克斯拉曼（CARS）光谱成像
Optics continuum Pub Date : 2023-09-05 DOI: 10.1364/optcon.497869
Yusuke Murakami, Minami Yoshimura, W.J. Klement, Atsuki Oda, Ryo Sakamoto, Miho Yakabe, Atsushi Matsumoto, Ryosuke Oketani, P. Leproux, Junichi Ikenouchi, Wesley Browne, Hideaki Kano
{"title":"Backward multiplex coherent anti-Stokes Raman (CARS) spectroscopic imaging with electron-multiplying CCD (EMCCD) camera","authors":"Yusuke Murakami, Minami Yoshimura, W.J. Klement, Atsuki Oda, Ryo Sakamoto, Miho Yakabe, Atsushi Matsumoto, Ryosuke Oketani, P. Leproux, Junichi Ikenouchi, Wesley Browne, Hideaki Kano","doi":"10.1364/optcon.497869","DOIUrl":"https://doi.org/10.1364/optcon.497869","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48123693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing Signal Quality in Dense Wavelength Division Multiplexed Systems by Eliminating Crosstalk with Cascaded Optical Bandpass Filters 用级联光带通滤波器消除串扰提高密集波分复用系统的信号质量
Optics continuum Pub Date : 2023-09-04 DOI: 10.1364/optcon.495028
Changxin Rin, Hiroyuki Uenohara
{"title":"Enhancing Signal Quality in Dense Wavelength Division Multiplexed Systems by Eliminating Crosstalk with Cascaded Optical Bandpass Filters","authors":"Changxin Rin, Hiroyuki Uenohara","doi":"10.1364/optcon.495028","DOIUrl":"https://doi.org/10.1364/optcon.495028","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42575809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
THE EFFECT OF NOISE-INDUCED QUANTUM COHERENCE IN THE INTERMEDIATE BAND SOLAR CELLS 噪声诱导量子相干性对中波段太阳能电池的影响
Optics continuum Pub Date : 2023-08-29 DOI: 10.1364/optcon.499396
Mohsen Daryani, Ali Rostami, ghafar darvish, Mohammad Moravvej-Farshi
{"title":"THE EFFECT OF NOISE-INDUCED QUANTUM COHERENCE IN THE INTERMEDIATE BAND SOLAR CELLS","authors":"Mohsen Daryani, Ali Rostami, ghafar darvish, Mohammad Moravvej-Farshi","doi":"10.1364/optcon.499396","DOIUrl":"https://doi.org/10.1364/optcon.499396","url":null,"abstract":"It has been shown that quantum coherence induced by incoherent light can increase the efficiency of solar cells. Here we evaluate the effect of such coherence in the intermediate band solar cells (IBSC). We first examine a six-level quantum IBSC model and demonstrate by simulation that the maximum output power in a solar cell with a quantum structure increases more than 16 percent in the case of coherence existence. We then propose an IBSC model which can absorb continuous spectra of sunlight and show that the quantum coherence can increase the output power of the cell. For instance, calculations indicate that the coherence makes an increase of about 31% in the maximum output power of a cell that the width of the conduction and intermediate bands are 100 and 10 meV, respectively. Also, our calculations show that the quantum coherence effect is still observed in increasing the solar cell power by expanding the width of the conduction band, although the output power is reduced due to an increase in thermalization loss. However, expanding the width of the intermediate band reduces the coherence effect.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136244260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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