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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Shao, Linbo Thomas, Joseph G. Srijanto, Bernadeta R. Lester, Kevin C. Kravchenko, Ivan I. Zhu, Yizheng Bradley Department of Electrical and Computer Engineering Virginia Tech 1185 Perry Street BlacksburgVA24061 United States Virginia Tech Center for Quantum Information Science and Engineering BlacksburgVA24061 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37830 United States

We demonstrate an optical analog-to-digital converter (ADC) leveraging spectral interferometry of an integrated electro-optic Mach-Zehnder interferometer on thin-film lithium niobate. The ADC features a high dynamic r... 详细信息

关键词： Mach-Zehnder interferometers

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光谱特征关联性分析用于研究CVD生长的单层二硫化钨非均匀性机制

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science China materials 2023年第10期66卷 3949-3957页

作者：苏立钦余一飞曹林友张勇 College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China Department of Electrical and Computer Engineering The University of North Carolina at CharlotteCharlotteNC 28223USA Department of Materials Science and Engineering North Carolina State UniversityRaleighNC 27695USA

化学气相沉积(CVD)已被证明是生产二维材料(包括二硫化钨(WS_(2)))最有效的方法.然而,CVD生长的WS_(2)单层中存在的应变、掺杂和缺陷的不均匀性会显著影响材料的光学和电子特性,从而影响其器件应用.在本研究中,我们通过CVD方法在蓝宝石... 详细信息

化学气相沉积(CVD)已被证明是生产二维材料(包括二硫化钨(WS_(2)))最有效的方法.然而,CVD生长的WS_(2)单层中存在的应变、掺杂和缺陷的不均匀性会显著影响材料的光学和电子特性,从而影响其器件应用.在本研究中,我们通过CVD方法在蓝宝石衬底上生长了介观尺寸的三角形单层WS_(2),并利用空间分辨的显微拉曼和光致发光(PL)光谱技术系统地表征了单层WS_(2)中的应变、掺杂和非辐射缺陷中心的不均匀性.我们从全域(整个单层WS_(2)三角形)和分区域(如顶点、边缘、中心)两个维度对其拉曼和PL光谱的相关参数(即峰值位置、强度和半峰宽)随位置的变化进行了相关性分析,发现单层WS_(2)三角形的不同区域往往表现出明显不同的应变、掺杂和缺陷状态.这项研究揭示并解释了单层WS_(2)应变、掺杂和缺陷的不均匀性.此外,我们发现当介观尺寸的三角形结构扩展到连续薄膜时,不均匀性大大降低.我们的工作表明,对光谱特征的相关性分析并辅以对物理机制的了解有助于全面理解材料生长带来的不均匀性,并为优化二维材料的生长过程和器件加工提供指导.

关键词： tungsten disulfide Raman spectroscopy photoluminescence chemical vapor deposition

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Information Rates Over DMCs with Many Independent Views

Information Rates Over DMCs with Many Independent Views

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IEEE International Symposium on Information Theory

作者： V. Arvind Rameshwar Nir Weinberger IUDX Program Unit Indian Institute of Science Bengaluru India Department of Electrical and Computer Engineering Technion Haifa Israel

ISBN: (数字)9798350382846

ISBN: (纸本)9798350382853

In this paper, we investigate the fundamental limits of reliable communication over a discrete memoryless channel (DMC) when there are a large number of noisy views of a transmitted symbol, i.e., when several copies of a single symbol are sent independently through the DMC. We argue that the channel capacity and dispersion of such a multi-view DMC converge exponentially quickly in the number of views to to the entropy and varentropy of the input distribution, respectively, and identify the exact rate of convergence. This rate equals the smallest Chernoff information between two conditional distributions of the output given unequal inputs. Our results hence help us characterize the largest finite-blocklength rates achievable for any fixed error probability. We also present a new channel model that we call the Poisson approximation channel-of possible independent interest-whose capacity closely approximates the capacity of the multi-view binary symmetric channel (BSC).

关键词： Monte Carlo methods Error probability Symbols Entropy Memoryless systems Reliability Noise measurement

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An on-chip platform for multi-degree-of-freedom control of two-dimensional quantum and nonlinear materials

An on-chip platform for multi-degree-of-freedom control of t...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Tang, Haoning Wang, Yiting Ni, Xueqi Watanabe, Kenji Taniguchi, Takashi Fan, Shanhui Mazur, Eric Yacoby, Amir Cao, Yuan School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Electrical Engineering and Computer Science University of California at Berkeley BerkeleyCA94720 United States National Institute for Materials Science Namiki 1-1 Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Ginzton Laboratory Stanford University StanfordCA94305 United States

We introduce the first on-chip, microelectromechanical system for the in situ tuning of twisted 2D materials, enabling tunable interfacial properties, synthetic topological singularities, and adjustable-polarization l... 详细信息

关键词： Degrees of freedom (mechanics)

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Social Media Analysis using Sentiment Analysis on COVID-19 from Twitter 6

Social Media Analysis using Sentiment Analysis on COVID-19 f...

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6th International Conference on Information Technology, Information Systems and electrical engineering, ICITISEE 2022

作者： Iqbal Maulana, Fairuz Heryadi, Yaya Lukas Suparta, Wayan Arifin, Yulyani Computer Science Department BINUS Graduate Program Computer Science Bina Nusantara University Jakarta11480 Indonesia Faculty of Engineering Jakarta12930 Indonesia Institut Teknologi Nasional Yogyakarta Faculty of Industrial Technology Department of Electrical Engineering Yogyakarta55281 Indonesia Bina Nusantara University School of Computer Science Computer Science Department Jakarta11480 Indonesia

ISBN: (纸本)9798350399615

The development of the internet is getting faster, participating in encouraging the emergence of new and innovative information. In filtering the various information that appears, we need a recommended system to perform well for users in today's internet era. A well-performing recommendation system in question is a reliable recommendation algorithm. This algorithm is fundamental to analyzing various information, such as responses on social media based on user behavior data related to the topic of COVID. This data is crawled from tweets on social media Twitter. The data analysis algorithm obtained uses Python, which is then visualized in the form of a diagram. The processed data is user comments on Twitter, and the text data is analyzed using Python, using more than 60000 data sets taken to form visualizations and conclusions. From sentiment analysis, polarity and subjectivity data are obtained to be analyzed, which are negative, neutral, or positive. The result is show positive tweets with 29.2%, negative tweets is 13%, and 57.8% neutral tweets. Lastly, sentiment analysis can help people effectively infer vast and complex data from social media like Twitter. © 2022 IEEE.

关键词： COVID-19 python sentiment analysis social media twitter

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Excitation protocols for nonlinear phononics in bismuth and antimony

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Physical Review materials 2024年第1期8卷 015202-015202页

作者： Anubhab Haldar Zhengjie Huang Xuedan Ma Pierre Darancet Sahar Sharifzadeh Department of Electrical and Computer Engineering Boston University Boston Massachusetts 02215 USA Center for Nanoscale Materials Argonne National Laboratory Argonne Illinois 60439 USA Northwestern Argonne Institute of Science and Engineering Evanston Illinois 60208 USA Consortium for Advanced Science and Engineering The University of Chicago Chicago Illinois 60637 USA Division of Materials Science and Engineering Boston University Boston Massachusetts 02215 USA

We study the optical generation and control of coherent phonons in elemental bismuth (Bi) and antimony (Sb) using a classical equation of motion informed by first-principles calculations of the potential energy surface and the frequency-dependent macroscopic dielectric function along the zone-centered optical phonon coordinates. Using this approach, we demonstrate that phonons with the largest optomechanical couplings also have the strongest degree of anharmonicity among the zone-centered modes, a result of the broken-symmetry structural ground state of Bi and Sb. We show how this anharmonicity, explaining the light-induced phonon softening observed in experiments, prevents the application of standard phonon-amplification and annihilation protocols. We introduce a simple linearization protocol that extends the use of such protocols to the case of anharmonic phonons in broken-symmetry materials, and demonstrate its efficiency at high displacement amplitudes. Our formalism and results provide a path for improving optical control in nonlinear phononics.

关键词： First-principles calculations Optical phonons Optoelectronics

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Active twistoptics: on-chip multidimensional dynamic control for data hypercube reconstruction

Active twistoptics: on-chip multidimensional dynamic control...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Tang, Haoning Lou, Beicheng Du, Fan Gao, Guangqi Zhang, Mingjie Ni, Xueqi Yacoby, Amir Cao, Yuan Fan, Shanhui Mazur, Eric School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Electrical Engineering and Computer Science University of California at Berkeley BerkeleyCA94720 United States National Institute for Materials Science Namiki 1-1 Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Ginzton Laboratory Stanford University StanfordCA94305 United States

Our MEMS-integrated twistoptics device enables precise control of interlayer gaps and twist angles in photonic crystals, achieving high-accuracy, multidimensional light manipulation with significant potential in recon... 详细信息

ISBN: (纸本)9781957171395

关键词： Nanophotonics

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Active twistoptics: on-chip multidimensional dynamic control for data hypercube reconstruction

Active twistoptics: on-chip multidimensional dynamic control...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Nanophotonics

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Promoting spintronic terahertz radiation via Tamm plasmon coupling

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Photonics Research 2023年第6期11卷 1057-1066页

作者： YUNQING JIANG HONGQING LI XIAOQIANG ZHANG FAN ZHANG YONG XU YONGGUANG XIAO FENGGUANG LIU ANTING WANG QIWEN ZHAN WEISHENG ZHAO School of Integrated Circuit Science and Engineering Hefei Innovation Research InsitituteBeihang UniversityBeijing 100191China Anhui High Reliability Chips Engineering Laboratory Hefei 230013China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Spectral fingerprint and terahertz(THz)field-induced carrier dynamics demands the exploration of broadband and intense THz signal *** THz emitters(STEs),with high stability,a low cost,and an ultrabroad bandwidth,have been a hot topic in the field of THz *** of the main barriers to their practical application is lack of an STE with strong radiation ***,through the combination of optical physics and ultrafast photonics,the Tamm plasmon coupling(TPC)facilitating THz radiation is realized between spin THz thin films and photonic crystal *** results show that the spectral absorptance can be increased from 36.8%to 94.3%for spin THz thin films with *** coupling with narrowband resonance not only improves the optical-to-spin conversion efficiency,but also guarantees THz transmission with a negligible loss(~4%)for the photonic crystal *** to the simulation,we prepared this structure successfully and experimentally realized a 264%THz radiation ***,the spin THz thin films with TPC exhibited invariant absorptivity under different polarization modes of the pump beam and weakening confinement on an obliquely incident pump *** approach is easy to implement and offers possibilities to overcome compatibility issues between the optical structure design and low energy consumption for ultrafast THz optospintronics and other similar devices.

关键词： pump polarization coupling

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Advancing athermal silica fiber lasers to watt-level power and beyond 7

Advancing athermal silica fiber lasers to watt-level power a...

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Photonic Heat Engines: science and Applications VII 2025

作者： Chen, Chun-Wei Balliu, Enkeleda Meehan, Bailey Hawkins, Thomas W. Ballato, John Dragic, Peter D. Boilard, Tommy Bernier, Martin Digonnet, Michel J.F. Edward L. Ginzton Laboratory Stanford University StanfordCA94305 United States Cobolt AB HÜBNER Photonics Solna171 54 Sweden Department of Materials Science and Engineering Clemson University SC United States Department of Electrical Computer Engineering University of Illinois at Urbana-Champaign IL United States Université Laval Québec Canada

ISBN: (数字)9781510685079

ISBN: (纸本)9781510685062

Waste heat in fiber lasers poses major challenges in frequency, power, and pointing stabilities, as well as beam quality and power scaling. Using anti-Stokes-fluorescence cooling, we developed a radiation-balanced Yb-doped silica fiber amplifier with a novel aluminophosphosilicate core-glass composition that delivers 575 mW with no net internal heat generation by amplifying a 0.9-mW seed at 1064 nm (28.0 dB of gain). With a lower seed power (0.4 mW), a radiation-balanced gain of 31.5 dB was achieved. We discuss the strategies and recent progress in silicate-glass engineering that enabled this breakthrough performance in a small-core fiber at atmospheric pressure, as well as the potential for power-scaling radiation-balanced fiber lasers to the 100-watt level through advanced fiber designs. Our findings point to a promising path for stable high-power operation free from thermal limitations. © 2025 SPIE.

关键词： Laser cooling

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