arXiv - PHYS - Optics最新文献_第5页

Low-loss twist-tunable in-plane anisotropic polaritonic crystals 低损耗扭曲可调面内各向异性偏振晶体

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.07861

Nathaniel Capote-Robayna, Ana I. F. Tresguerres-Mata, Aitana Tarazaga Martín-Luengo, Enrique Terán-García, Luis Martin-Moreno, Pablo Alonso-González, Alexey Y. Nikitin

{"title":"Low-loss twist-tunable in-plane anisotropic polaritonic crystals","authors":"Nathaniel Capote-Robayna, Ana I. F. Tresguerres-Mata, Aitana Tarazaga Martín-Luengo, Enrique Terán-García, Luis Martin-Moreno, Pablo Alonso-González, Alexey Y. Nikitin","doi":"arxiv-2409.07861","DOIUrl":"https://doi.org/arxiv-2409.07861","url":null,"abstract":"Van der Waals (vdW) materials supporting phonon polaritons (PhPs) - light\u0000coupled to lattice vibrations - have gathered significant interest because of\u0000their intrinsic anisotropy and low losses. In particular, $alpha$-MoO$_3$\u0000supports PhPs with in-plane anisotropic propagation, which has been exploited\u0000to tune the optical response of twisted bilayers and trilayers. Additionally,\u0000various studies have explored the realization of polaritonic crystals (PCs) -\u0000lattices with periods comparable to the polariton wavelength -. PCs consisting\u0000of hole arrays etched in $alpha$-MoO$_3$ slabs exhibit Bragg resonances\u0000dependent on the angle between the crystallographic axes and the lattice\u0000vectors. However, such PC concept, with a fixed orientation and size of its\u0000geometrical parameters, constrains practical applications and introduces\u0000additional scattering losses due to invasive fabrication processes. Here we\u0000demonstrate a novel PC concept that overcomes these limitations, enabling\u0000low-loss optical tuning. It comprises a rotatable pristine $alpha$-MoO$_3$\u0000layer located on a periodic hole array fabricated in a metallic layer. Our\u0000design prevents degradation of the $alpha$-MoO$_3$ optical properties caused\u0000by fabrication, preserving its intrinsic low-loss and in-plane anisotropic\u0000propagation of PhPs. The resulting PC exhibits rotation of the Bloch modes,\u0000which is experimentally visualized by scanning near-field microscopy. In\u0000addition, we experimentally determine the polaritons momentum and reconstruct\u0000their band structure. These results pave the way for mechanically tunable\u0000nanooptical components based on polaritons for potential lasing, sensing, or\u0000energy harvesting applications.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183472","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

Ultrafast Laser-Fabricated Fluoride Glass Waveguides with Exceptionally High Refractive Index Change for Mid-Infrared Integrated Optics 用于中红外集成光学器件的具有超高折射率变化的超快激光制造氟化玻璃波导

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.07674

T Toney Fernandez, Y Hwang, H Mahmodi, D Otten, L Plenecassagne, S Cozic, S Gross, I Kabakova, M Withford, M Poulain, A Fuerbach, D Lancaster

{"title":"Ultrafast Laser-Fabricated Fluoride Glass Waveguides with Exceptionally High Refractive Index Change for Mid-Infrared Integrated Optics","authors":"T Toney Fernandez, Y Hwang, H Mahmodi, D Otten, L Plenecassagne, S Cozic, S Gross, I Kabakova, M Withford, M Poulain, A Fuerbach, D Lancaster","doi":"arxiv-2409.07674","DOIUrl":"https://doi.org/arxiv-2409.07674","url":null,"abstract":"This study reports the successful fabrication of high-positive refractive\u0000index change waveguides, exceeding 0.02 in fluoride glasses, marking a\u0000significant advancement in integrated optical components for visible to\u0000mid-infrared applications. This research overcomes longstanding challenges in\u0000direct-write photonics and therefore enables the realization of true 3D\u0000geometries in optical elements, access to novel visible lasing wavelengths\u0000typically suppressed in high phonon hosts, and the miniaturization of\u0000mid-infrared optical devices. The investigation into the waveguides' origin\u0000attributes the exceptionally high index change to material densification driven\u0000by the migration of specific elements, mainly barium, within the glass\u0000composition. These waveguides, characterized by low insertion losses, and\u0000highly customizable V-numbers evidenced by multimode operation at 3.5 um,\u0000offers substantial potential for chip laser technology and the creation of\u0000advanced optical devices for sensing and spectroscopy.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183474","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

All-optical Fourier neural network using partially coherent light 使用部分相干光的全光学傅立叶神经网络

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.08070

Jianwei Qin, Yanbing Liu, Yan Liu, Xun Liu, Wei Li, Fangwei Ye

{"title":"All-optical Fourier neural network using partially coherent light","authors":"Jianwei Qin, Yanbing Liu, Yan Liu, Xun Liu, Wei Li, Fangwei Ye","doi":"arxiv-2409.08070","DOIUrl":"https://doi.org/arxiv-2409.08070","url":null,"abstract":"Optical neural networks present distinct advantages over traditional\u0000electrical counterparts, such as accelerated data processing and reduced energy\u0000consumption. While coherent light is conventionally employed in optical neural\u0000networks, our study proposes harnessing spatially incoherent light in\u0000all-optical Fourier neural networks. Contrary to numerical predictions of\u0000declining target recognition accuracy with increased incoherence, our\u0000experimental results demonstrate a surprising outcome: improved accuracy with\u0000incoherent light. We attribute this unexpected enhancement to spatially\u0000incoherent light's ability to alleviate experimental errors like diffraction\u0000rings, laser speckle, and edge effects. Our controlled experiments introduced\u0000spatial incoherence by passing monochromatic light through a spatial light\u0000modulator featuring a dynamically changing random phase array. These findings\u0000underscore partially coherent light's potential to optimize optical neural\u0000networks, delivering dependable and efficient solutions for applications\u0000demanding consistent accuracy and robustness across diverse conditions.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183470","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

THz Second and Third Harmonic Generation in PdCoO$_2$ Thin Films PdCoO$_2$ 薄膜中的太赫兹二次谐波和三次谐波生成

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.07872

T. Priessnitz, L. Feng, T. V. A. G. de Oliveira, G. Baker, I. Ilyakov, A. Ponomaryov, A. Arshad, G. L. Prajapati, J. -C. Deinert, S. Kovalev, B. Keimer, S. Kaiser

{"title":"THz Second and Third Harmonic Generation in PdCoO$_2$ Thin Films","authors":"T. Priessnitz, L. Feng, T. V. A. G. de Oliveira, G. Baker, I. Ilyakov, A. Ponomaryov, A. Arshad, G. L. Prajapati, J. -C. Deinert, S. Kovalev, B. Keimer, S. Kaiser","doi":"arxiv-2409.07872","DOIUrl":"https://doi.org/arxiv-2409.07872","url":null,"abstract":"Terahertz high harmonic generation (THz HHG) is a common property of\u0000nonlinear systems. Recently it has been used to investigate fundamental\u0000principles that govern transport and nonlinear dynamics in novel quantum\u0000materials like graphene, Dirac semimetals or high-temperature superconductors.\u0000Here, we report on the observation of exceptionally large THz second harmonic\u0000and third harmonic generation in thin films of the highly conducting\u0000delafossite PdCoO$_2$ down to low temperatures. The growth of this material on\u0000offcut substrate allows for a significant enhancement of the third harmonic\u0000intensity compared to ordinary $c$-axis grown thin films. Furthermore, it\u0000appears to be a necessity for the observation of THz second harmonic\u0000generation. We model the temperature dependence of the third harmonic\u0000generation by means of Boltzmann transport theory and provide an explanation\u0000for the second harmonic generation by comparing the system to the electric\u0000field induced second harmonic generation. The present investigation thus\u0000provides an important contribution to the ongoing discussion of low temperature\u0000origins of THz HHG and might serve as a new platform for THz high harmonic\u0000applications.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183476","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

Leveraging Multiplexed Metasurfaces for Multi-Task Learning with All-Optical Diffractive Processors 利用全光学衍射处理器的多路复用元表面进行多任务学习

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.08423

Sahar Behroozinia, Qing Gu

{"title":"Leveraging Multiplexed Metasurfaces for Multi-Task Learning with All-Optical Diffractive Processors","authors":"Sahar Behroozinia, Qing Gu","doi":"arxiv-2409.08423","DOIUrl":"https://doi.org/arxiv-2409.08423","url":null,"abstract":"Diffractive Neural Networks (DNNs) leverage the power of light to enhance\u0000computational performance in machine learning, offering a pathway to\u0000high-speed, low-energy, and large-scale neural information processing. However,\u0000most existing DNN architectures are optimized for single tasks and thus lack\u0000the flexibility required for the simultaneous execution of multiple tasks\u0000within a unified artificial intelligence platform. In this work, we utilize the\u0000polarization and wavelength degrees of freedom of light to achieve optical\u0000multi-task identification using the MNIST, FMNIST, and KMNIST datasets.\u0000Employing bilayer cascaded metasurfaces, we construct dual-channel DNNs capable\u0000of simultaneously classifying two tasks, using polarization and wavelength\u0000multiplexing schemes through a meta-atom library. Numerical evaluations\u0000demonstrate performance accuracies comparable to those of individually trained\u0000single-channel, single-task DNNs. Extending this approach to three-task\u0000parallel recognition reveals an expected performance decline yet maintains\u0000satisfactory classification accuracies of greater than 80% for all tasks. We\u0000further introduce a novel end-to-end joint optimization framework to redesign\u0000the three-task classifier, demonstrating substantial improvements over the\u0000meta-atom library design and offering the potential for future multi-channel\u0000DNN designs. Our study could pave the way for the development of ultrathin,\u0000high-speed, and high-throughput optical neural computing systems.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142256537","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

Overcoming stress limitations in SiN nonlinear photonics via a bilayer waveguide 通过双层波导克服氮化硅非线性光子学中的应力限制

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.08358

Karl J. McNulty, Shriddha Chaitanya, Swarnava Sanyal, Andres Gil-Molina, Mateus Corato-Zanarella, Yoshitomo Okawachi, Alexander L. Gaeta, Michal Lipson

引用次数: 0

Logarithmically complex rigorous Fourier space solution to the 1D grating diffraction problem 一维光栅衍射问题的对数复杂严格傅里叶空间解法

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.07821

Evgeniy Levdik, Alexey A. Shcherbakov

{"title":"Logarithmically complex rigorous Fourier space solution to the 1D grating diffraction problem","authors":"Evgeniy Levdik, Alexey A. Shcherbakov","doi":"arxiv-2409.07821","DOIUrl":"https://doi.org/arxiv-2409.07821","url":null,"abstract":"The rigorous solution of the grating diffraction problem is a fundamental\u0000step in many scientific fields and industrial applications ranging from the\u0000study of the fundamental properties of metasurfaces to the simulation of\u0000lithography masks. Fourier space methods, such as the Fourier Modal Method, are\u0000established tools for the analysis of the electromagnetic properties of\u0000periodic structures, but are too computationally demanding to be directly\u0000applied to large and multiscale optical structures. This work focuses on\u0000pushing the limits of rigorous computations of periodic electromagnetic\u0000structures by adapting a powerful tensor compression technique called the\u0000tensor train decomposition. We have found that the millions and billions of\u0000numbers produced by standard discretization schemes are inherently excessive\u0000for storing the information about diffraction problems required for\u0000computations with a given accuracy, and we show that a logarithmically growing\u0000amount of information is sufficient for reliable rigorous solution of the\u0000Maxwell's equations on an example of large period multiscale 1D grating\u0000structures.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183477","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

Mapping the nanoscale optical topological textures with a fiber-integrated plasmonic probe 利用光纤集成等离子探针绘制纳米级光学拓扑纹理图

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.07894

Yunkun Wu, Shu Wang, Xinrui Lei, Jiahui Mao, Liu Lu, Yue Liu, Guangyuan Qu, Guangcan Guo, Qiwen Zhan, Xifeng Ren

{"title":"Mapping the nanoscale optical topological textures with a fiber-integrated plasmonic probe","authors":"Yunkun Wu, Shu Wang, Xinrui Lei, Jiahui Mao, Liu Lu, Yue Liu, Guangyuan Qu, Guangcan Guo, Qiwen Zhan, Xifeng Ren","doi":"arxiv-2409.07894","DOIUrl":"https://doi.org/arxiv-2409.07894","url":null,"abstract":"Topologically protected quasiparticles in optics have received increasing\u0000research attention recently, as they provide novel degree of freedom to\u0000manipulate light-matter interactions and exhibiting excellent potential in\u0000nanometrology and ultrafast vector imaging. However, the characterization of\u0000the full three-dimensional vectorial structures of the topological texures at\u0000the nanoscale has remained a challenge. Here, we propose a novel probe based on\u0000the fiber taper-silver nanowire waveguide structure to achieve super-resolution\u0000mapping of the topological textures. Based on the mode selection rules, the\u0000three-dimensional decomposed electric fields in both the far-field and\u0000near-field are directly collected and reconstructed without postprocessing\u0000algorithms, clearly visualizing the topological texures formed in free space\u0000and evanescent waves respectively. The fiber-integrated probe is further\u0000demonstrated to be robust and broadband. This approach holds promise for the\u0000characterization of more sophisticated topology in optical field, which may\u0000allow for advance applications in optical information processing and data\u0000storage.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183471","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

Ultra-wideband integrated microwave photonic multi-parameter measurement system on thin-film lithium niobate 铌酸锂薄膜超宽带集成微波光子多参数测量系统

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.07817

Yong Zheng, Zhen Han, LiHeng Wang, Pu Zhang, YongHeng Jiang, HuiFu Xiao, XuDong Zhou, Mingrui Yuan, Mei Xian Low, Aditya Dubey, Thach Giang Nguyen, Andreas Boes, Qinfen Hao, Guanghui Ren, Arnan Mitchell, Yonghui Tian

{"title":"Ultra-wideband integrated microwave photonic multi-parameter measurement system on thin-film lithium niobate","authors":"Yong Zheng, Zhen Han, LiHeng Wang, Pu Zhang, YongHeng Jiang, HuiFu Xiao, XuDong Zhou, Mingrui Yuan, Mei Xian Low, Aditya Dubey, Thach Giang Nguyen, Andreas Boes, Qinfen Hao, Guanghui Ren, Arnan Mitchell, Yonghui Tian","doi":"arxiv-2409.07817","DOIUrl":"https://doi.org/arxiv-2409.07817","url":null,"abstract":"Research on microwave signal measurement techniques is risen, driven by the\u0000expanding urgent demands of wireless communication, global positioning systems,\u0000remote sensing and 6G networks. In stark contrast with traditional\u0000electronic-based realization, the implementations of microwave signal\u0000measurement systems based on integrated compact photonic chip have exhibited\u0000distinct advantages in high operation bandwidth, light weight, and strong\u0000immunity to electromagnetic interference. However, although numerous integrated\u0000microwave photonic signal measurement systems have been reported, measurement\u0000bandwidth of the majority of them is still below 30 GHz due to the bandwidth\u0000limitation of electro-optical modulators (EOMs). Furthermore, previous studies\u0000often are more focused on the measurement of one single parameter (typically\u0000the frequency) of microwave signals, which has hindered their practical\u0000application in complex situations. Here, an integrated photonic microwave\u0000multi-parameter measurement system composed of microwave frequency measurement\u0000module and microwave phase amplitude measurement module based on thin-film\u0000lithium niobate (TFLN) platform is reported. Utilizing this system, not only\u0000the ultra-high bandwidth (up to 60GHz) of microwave frequency, phase and\u0000amplitude measurement with low root-mean-squares errors (450MHz, 3.43{deg} and\u00001.64% of the measurement for frequency, phase and amplitude, respectively), but\u0000also the time-domain reconstruction of sinusoidal microwave signals is\u0000achieved. This demonstration further broadens the application of integrated\u0000TFLN photonic devices in microwave signal measurement technology to address the\u0000bandwidth bottleneck of the ever-growing microwave networks in the future\u0000information society.","PeriodicalId":501214,"journal":{"name":"arXiv - PHYS - Optics","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183473","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

Ultrashort laser-induced nuclear reactions: initiating decay of helium nuclei and subsequent fusion reactions 超短激光诱导核反应：引发氦核衰变和随后的聚变反应

arXiv - PHYS - Optics Pub Date : 2024-09-12 DOI: arxiv-2409.08186

L. M. Kovachev, E. Iordanova, G. Yankov, I. P. Angelov

引用次数: 0