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Chiral detection of biomolecules based on reinforcement learning 被引量:2
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作者 Yuxiang Chen Fengyu Zhang +8 位作者 Zhibo Dang Xiao He Chunxiong Luo Zhengchang Liu Pu Peng yuchen dai Yijing Huang Yu Li Zheyu Fang 《Opto-Electronic Science》 2023年第1期1-10,共10页
Chirality plays an important role in biological processes,and enantiomers often possess similar physical properties and different physiologic functions.In recent years,chiral detection of enantiomers become a popular ... Chirality plays an important role in biological processes,and enantiomers often possess similar physical properties and different physiologic functions.In recent years,chiral detection of enantiomers become a popular topic.Plasmonic metasurfaces enhance weak inherent chiral effects of biomolecules,so they are used in chiral detection.Artificial intelligence algorithm makes a lot of contribution to many aspects of nanophotonics.Here,we propose a nanostructure design method based on reinforcement learning and devise chiral nanostructures to distinguish enantiomers.The algorithm finds out the metallic nanostructures with a sharp peak in circular dichroism spectra and emphasizes the frequency shifts caused by nearfield interaction of nanostructures and biomolecules.Our work inspires universal and efficient machine-learning methods for nanophotonic design. 展开更多
关键词 chiral detection metasurface deep learning CATHODOLUMINESCENCE
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治理的媒介化?——重思媒介化研究的本土取径
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作者 戴宇辰 葛家明 《全球传媒学刊》 2023年第6期146-163,共18页
由于媒介与治理的互动在中国语境中愈益显著,学者们往往引用“媒介化”作为理论资源对之进行解释,并以此形成了“媒介化治理”的本土研究领域。当前国内媒介化治理研究存在着“前台与后台”“事件与过程”“行动与结构”三组范畴断联的... 由于媒介与治理的互动在中国语境中愈益显著,学者们往往引用“媒介化”作为理论资源对之进行解释,并以此形成了“媒介化治理”的本土研究领域。当前国内媒介化治理研究存在着“前台与后台”“事件与过程”“行动与结构”三组范畴断联的问题,造成该理论经验解释上的难点。本研究通过援引政治社会学中的“结构过程”范式,尝试对本土媒介化治理研究的中层分析框架进行针对性建构,并结合J省A县融媒体中心建设的经验案例进行检验。最终,本研究尝试归纳出本土媒介化治理研究的“结构过程”取径,并希望能够对更广泛的本土媒介化研究提供一定的路径补充。 展开更多
关键词 媒介化理论 治理研究 “结构过程”范式 媒介化治理
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Phonon-assisted upconversion in twisted two-dimensional semiconductors 被引量:1
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作者 yuchen dai Pengfei Qi +13 位作者 Guangyi Tao Guangjie Yao Beibei Shi Zhixin Liul Zhengchang Liu Xiao He Pu Peng Zhibo Dang Liheng Zheng Tianhao Zhang Yongji Gong Yan Guan Kaihui Liu Zheyu Fang 《Light(Science & Applications)》 SCIE EI CAS CSCD 2023年第1期89-98,共10页
Phonon-assisted photon upconversion(UPC)is an anti-Stokes process in which incident photons achieve higher energy emission by absorbing phonons.This letter studies phonon-assisted UPC in twisted 2D semiconductors,in w... Phonon-assisted photon upconversion(UPC)is an anti-Stokes process in which incident photons achieve higher energy emission by absorbing phonons.This letter studies phonon-assisted UPC in twisted 2D semiconductors,in which an inverted contrast between UPC and conventional photoluminescence(PL)of WSe2 twisted bilayer is emergent.A 4-fold UPC enhancement is achieved in 5.5°twisted bilayer while PL weakens by half.Reduced interlayer exciton conversion efficiency driven by lattice relaxation,along with enhanced pump efficiency resulting from spectral redshift,lead to the rotation-angle-dependent UPC enhancement.The counterintuitive phenomenon provides a novel insight into a unique way that twisted angle affects UPC and light-matter interactions in 2D semiconductors.Furthermore,the UPC enhancement platform with various superimposable means offers an effective method for lighting bilayers and expanding the application prospect of 2D stacked van der Waals devices. 展开更多
关键词 TWISTED SEMICONDUCTORS RELAXATION
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Self-design of arbitrary polarization-control waveplates via deep neural networks
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作者 ZHENGCHANG LIU ZHIBO DANG +6 位作者 ZHIXIN LIU YU LI XIAO HE yuchen dai YUXIANG CHEN PU PENG ZHEYU FANG 《Photonics Research》 SCIE EI CAS CSCD 2023年第5期695-711,共17页
The manipulation of polarization states beyond the optical limit presents advantages in various applications.Considerable progress has been made in the design of meta-waveplates for on-demand polarization transformati... The manipulation of polarization states beyond the optical limit presents advantages in various applications.Considerable progress has been made in the design of meta-waveplates for on-demand polarization transformation,realized by numerical simulations and parameter sweep methodologies.However,due to the limited freedom in these classical strategies,particular challenges arise from the emerging requirement for multiplex optical devices and multidimensional manipulation of light,which urge for a large number of different nanostructures with great polarization control capability.Here,we demonstrate a set of self-designed arbitrary wave plates with a high polarization conversion efficiency.We combine Bayesian optimization and deep neural networks to design perfect halfand quarter-waveplates based on metallic nanostructures,which experimentally demonstrate excellent polarization control functionalities with the conversion ratios of 85%and 90%.More broadly,we develop a comprehensive wave plate database consisting of various metallic nanostructures with high polarization conversion efficiency,accompanying a flexible tuning of phase shifts(0-2π)and group delays(0-10 fs),and construct an achromatic metalens based on this database.Owing to the versatility and excellent performance,our self-designed wave plates can promote the performance of multiplexed broadband metasurfaces and find potential applications in compact optical devices and polarization division multiplexing optical communications. 展开更多
关键词 POLARIZATION tuning WAVE
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Giant excitonic upconverted emission from two-dimensional semiconductor in doubly resonant plasmonic nanocavity 被引量:1
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作者 Pengfei Qi yuchen dai +9 位作者 Yang Luo Guangyi Tao Liheng Zheng Donglin Liu Tianhao Zhang Jiadong Zhou Bo Shen Feng Lin Zheng Liu Zheyu Fang 《Light(Science & Applications)》 SCIE EI CAS CSCD 2022年第7期1523-1534,共12页
Phonon-assisted upconverted emission is the heart of energy harvesting,bioimaging,optical cryptography,and optical refrigeration.It has been demonstrated that emerging two-dimensional(2D)semiconductors can provide an ... Phonon-assisted upconverted emission is the heart of energy harvesting,bioimaging,optical cryptography,and optical refrigeration.It has been demonstrated that emerging two-dimensional(2D)semiconductors can provide an excellent platform for efficient phonon-assisted upconversion due to the enhanced optical transition strength and phonon-exciton interaction of 2D excitons.However,there is little research on the further enhancement of excitonic upconverted emission in 2D semiconductors.Here,we report the enhanced multiphoton upconverted emission of 2D excitons in doubly resonant plasmonic nanocavities.Owing to the enhanced light collection,enhanced excitation rate,and quantum efficiency enhancement arising from the Purcell effect,an upconverted emission amplification of>1000-fold and a decrease of 2~3 orders of magnitude in the saturated excitation power are achieved.These findings pave the way for the development of excitonic upconversion lasing,nanoscopic thermometry,and sensing,revealing the possibility of optical refrigeration in future 2D electronic or excitonic devices. 展开更多
关键词 converted RESONANT DOUBLY
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