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| 1 | Quantifying Information via Shannon Entropy in Spatially Structured Optical Beams显示文摘While information is ubiquitously generated,shared,and analyzed in a modern-day life,there is still some controversy around the ways to assess the amount and quality of information inside a noisy optical channel.A number of theoretical approaches based on,e.g.,conditional Shannon entropy and Fisher information have been developed,along with some experimental validations.Some of these approaches are limited to a certain alphabet,while others tend to fall short when considering optical beams with a nontrivial structure,such as Hermite-Gauss,Laguerre-Gauss,and other modes with a nontrivial structure.Here,we propose a new definition of the classical Shannon information via the Wigner distribution function,while respecting the Heisenberg inequality.Following this definition,we calculate the amount of information in Gaussian,Hermite-Gaussian,and LaguerreGaussian laser modes in juxtaposition and experimentally validate it by reconstruction of the Wigner distribution function from the intensity distribution of structured laser beams.We experimentally demonstrate the technique that allows to infer field structure of the laser beams in singular optics to assess the amount of contained information.Given the generality,this approach of defining information via analyzing the beam complexity is applicable to laser modes of any topology that can be described by well-behaved functions.Classical Shannon information,defined in this way,is detached from a particular alphabet,i.e.,communication scheme,and scales with the structural complexity of the system.Such a synergy between the Wigner distribution function encompassing the information in both real and reciprocal space and information being a measure of disorder can contribute into future coherent detection algorithms and remote sensing. | Maria Solyanik-Gorgone Jiachi Ye Mario Miscuglio Andrei Afanasev Alan E.Willner Volker J.Sorger | 2021 | Research2021，，1： | 1 |
| 2 | Quantifying Information via Shannon Entropy in Spatially Structured Optical Beams显示文摘While information is ubiquitously generated,shared,and analyzed in a modern-day life,there is still some controversy around the ways to assess the amount and quality of information inside a noisy optical channel.A number of theoretical approaches based on,e.g.,conditional Shannon entropy and Fisher information have been developed,along with some experimental validations.Some of these approaches are limited to a certain alphabet,while others tend to fall short when considering optical beams with a nontrivial structure,such as Hermite-Gauss,Laguerre-Gauss,and other modes with a nontrivial structure.Here,we propose a new definition of the classical Shannon information via the Wigner distribution function,while respecting the Heisenberg inequality.Following this definition,we calculate the amount of information in Gaussian,Hermite-Gaussian,and LaguerreGaussian laser modes in juxtaposition and experimentally validate it by reconstruction of the Wigner distribution function from the intensity distribution of structured laser beams.We experimentally demonstrate the technique that allows to infer field structure of the laser beams in singular optics to assess the amount of contained information.Given the generality,this approach of defining information via analyzing the beam complexity is applicable to laser modes of any topology that can be described by well-behaved functions.Classical Shannon information,defined in this way,is detached from a particular alphabet,i.e.,communication scheme,and scales with the structural complexity of the system.Such a synergy between the Wigner distribution function encompassing the information in both real and reciprocal space and information being a measure of disorder can contribute into future coherent detection algorithms and remote sensing. | Maria Solyanik-Gorgone Jiachi Ye Mario Miscuglio Andrei Afanasev Alan E.Willner Volker J.Sorger | 2022 | Research2022，，1： | 0 |
| 3 | 量子棒及其异质结的超低频拉曼光谱及有限元分析显示文摘硫族化镉纳米微晶由于具有发光效率高和发射波长可调谐等优良性质在光电器件中有重要的应用,CdSe/CdS点-棒异质结量子点是典型代表之一。本文中通过非共振拉曼方法探测了该量子点在5~50cm-1的声学声子模,利用不同模式的偏振特性,清晰地指认了球状核壳异质结量子点的扭转模式和径向呼吸模、棒状和点-棒异质结量子点的伸缩模和径向呼吸模等,并观察到了棒状量子点和点-棒异质结量子点的电子拉曼散射。同时发现点-棒异质结量子点的径向呼吸模较尺寸相当的纳米棒量子点发生红移。利用有限元方法形象模拟各量子点声学模的振动形式,并发现点-棒异质结量子点呼吸模振动的局域性。随后,引入局域有效声速的概念,利用改进的Lamb定律,成功解释了该红移是由CdSe核区域声速的减小所导致的,并再次验证该呼吸模局域在核附近区域。该研究对于表征和研究量子点中的限制性声学模具有重要意义,声学模和光学跃迁均局域在量子点附近区域的特性,对调控其激子-声子耦合和相关的光学性质具有重要指导意义。 | 林妙玲 MISCUGLIO Mario STASIO Francesco Di KRAHNE Roman 谭平恒 | 2018 | 光散射学报2018，30，3： | 0 |
| 4 | Electrical programmable multilevel nonvolatile photonic random-access memory显示文摘Photonic Random-Access Memories(P-RAM)are an essential component for the on-chip non-von Neumann photonic computing by eliminating optoelectronic conversion losses in data links.Emerging Phase-Change Materials(PCMs)have been showed multilevel memory capability,but demonstrations still yield relatively high optical loss and require cumbersome WRITE-ERASE approaches increasing power consumption and system package challenges.Here we demonstrate a multistate electrically programmed low-loss nonvolatile photonic memory based on a broadband transparent phase-change material(Ge2Sb2Se5,GSSe)with ultralow absorption in the amorphous state.A zero-staticpower and electrically programmed multi-bit P-RAM is demonstrated on a silicon-on-insulator platform,featuring efficient amplitude modulation up to 0.2 dB/μm and an ultralow insertion loss of total 0.12 dB for a 4-bit memory showing a 100×improved signal to loss ratio compared to other phase-change-materials based photonic memories.We further optimize the positioning of dual microheaters validating performance tradeoffs.Experimentally we demonstrate a half-a-million cyclability test showcasing the robust approach of this material and device.Low-loss photonic retention-of-state adds a key feature for photonic functional and programmable circuits impacting many applications including neural networks,LiDAR,and sensors for example. | Jiawei Meng Yaliang Gui Behrouz Movahhed Nouri Xiaoxuan Ma Yifei Zhang Cosmin-Constantin Popescu Myungkoo Kang Mario Miscuglio Nicola Peserico Kathleen Richardson Juejun Hu Hamed Dalir Volker J.Sorger | 2023 | Light(Science & Applications)2023，12，11： | 0 |
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