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Extra-narrowband metallic filters with an ultrathin single-layer metallic grating

Chinese Physics B 2020年第6期29卷 242-248页

作者： Ran Wang qi-huang gong Jian-Jun Chen State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Microelectronics Instruments and Equipments R&D Center Institude of Microelectronics of Chinese Academy of SciencesBeijing 100029China Nano-optoelectronics Frontier Center of Ministry of Education(NFC-MOE)&Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Narrowband and high-transmission optical filters are extensively used in color display technology, optical information processing, and high-sensitive sensing. Because of large ohmic losses in metallic nanostructures, metallic filters usually exhibit low transmittances and broad bandwidths. By employing both strong field enhancements in metallic nano-slits and the Wood’s anomaly in a periodic metallic grating, an extra-narrowband and high-transmission metallic filter is numerically predicted in an ultrathin single-layer metallic grating. Simulation results show that the Wood’s anomaly in the ultrathin(thickness H = 60 nm) single-layer metallic grating results in large field enhancements in the substrate and low losses in the metallic grating. As a result, the transmission bandwidth(transmittance T > 60%) at λ = 1200 nm is as small as △λFWHM=1.6 nm, which is smaller than 4% of that in the previous thin dielectric and metallic filters. The corresponding quality factor is as high as Q = λ/△λFWHM= 750, which is 40 times greater than that in the previous reports. Moreover, the thickness of our metallic filter(H = 60 nm) is smaller than 40% of that in the previous reports, and its maximum transmittance can reach up to 80%. In experiments, a narrowband metallic filter with a bandwidth of about △λFWHM = 10 nm, which is smaller than 25% of that in the previous metallic filters, is demonstrated.

关键词： metallic filter extra-narrowband field enhancement Wood’s anomaly

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Enhanced entanglement and asymmetric EPR steering between magnons

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 55-63页

作者： Sha-Sha Zheng Feng-Xiao Sun Huai-Yang Yuan Zbigniew Ficek qi-huang gong qiong-Yi He State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics School of Physics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing100871China Beijing Academy of Quantum Information Sciences Beijing100193China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China Institute for Theoretical Physics Utrecht University3584CCUtrechtThe Netherlands Quantum Optics and Engineering Division Institute of PhysicsUniversity of Zielona GóraZielona Góra65-516Poland

The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen(EPR)steering in macroscopic systems are outstanding challenges in modern ***,the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties are highly ***,we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light *** the absence of light,the two types of magnons on the two sublattices can be entangled,but no quantum steering occurs when they are damped with the same *** the presence of the cavity field,the entanglement can be significantly enhanced,and strong two-way asymmetric quantum steering appears between two magnons with equal *** is very different from the conventional protocols to produce asymmetric steering by imposing additional unbalanced losses or noises on the two parties at the cost of reducing *** essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity *** finding may provide a novel platform to manipulate the quantum steering and the detection of bi-party steering provides a knob to probe the magnetic damping on each sublattice of a magnet.

关键词： quantum information magnon entanglement Einstein-Podolsky-Rosen steering cavity induced cooling

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Fluorescence emission from excited molecular ions in intense femtosecond laser fields

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Frontiers of physics 2013年第1期8卷 34-38页

作者： Yun-Chen Wang Cheng-Yin Wu Yuan-Xing Liu Shao-Hua Xu qi-huang gong State Key Laboratory for Mesoscopic Physics Department of Physics Peking University Beijing 100871 China

Strong fluorescence emissions were observed for nitrogen, carbon monoxide, and carbon dioxide molecules in intense femtosecond laser fields. These emissions can be assigned to the transitions of the molecular ions from the excited electronic states to the ground electronic states. The formation mechanisms were discussed and the lifetimes were measured for these excited molecular ions in intense laser fields.

关键词： tunneling ionization molecular orbital fluorescence

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Fast-growing procedure for perovskite films in planar heterojunction perovskite solar cells

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Chinese Chemical Letters 2015年第12期26卷 1518-1521页

作者： Tang-Hao Liu Ke Chen qin Hu Jiang Wu De-Ying Luo Shuang Jia Rui Zhua qi-huang gong State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of Physics Peking University International Center for Quantum Materials School of Physics Peking University Collaborative Innovation Center of Quantum Matter

A fast-growing procedure（FGP） to fabricate perovskite films with large grain sizes is described in this article. In the FGP method, the perovskite precursor solution is coated onto the substrates at a temperature of 240 8C. The solvent in the precursor solution evaporates quickly in about 2 s, resulting in the rapid formation of a perovskite film without further annealing process. Millimeter-scale perovskite grain clusters are obtained in the film. Based on such perovskite films, fabricated planar heterojunction perovskite solar cells give a power conversion efficiency（PCE） above 8%.

关键词： perovskite planar annealing coated fabricate sizes micrograph quickly evaporation PEDOT

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Progress and realization platforms of dynamic topological photonics

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Chinese Physics B 2024年第1期33卷 75-87页

作者：闫秋辰马睿胡小永龚旗煌 State Key Laboratory for Mesoscopic Physics&Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-optoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Dynamic topological photonics is a novel research field, combining the time-domain optics and topological *** this review, the recent progress and realization platforms of dynamic topological photonics have been well *** definition, measurement methods and the evolution process of the dynamic topological photonics are demonstrated to better understand the physical diagram. This review is meant to bring the readers a different perspective on topological photonics, grasp the advanced progress of dynamic topology, and inspire ideas about future prospects.

关键词： dynamic topological photonics optical waveguide array topological optical lattice ultrafast spectroscopy

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Laser-induced Alignment and Coulomb Explosion of CO2

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Chinese Journal of Chemical Physics 2009年第6期22卷 571-576,J0001页

作者： Cheng-yin Wu Hong-yan Jiang Zhi-feng Wu qi-huang gong State Key Laboratory for Mesoscopic Physics Department of Physics Peking University Beijing 100872China

Dynamic processes of CO2 are experimentally studied in intense femtosecond laser fields with laser intensity varying from 1×10^13 W/cm^2 to 6×10^14 W/cm^2. When the laser intensity is below the ionization threshold, a coherent rotational wave-packet is formed for CO2 at room temperature through nonadiabatic rotational excitation. The evolution of the wave-packet leads to transient alignment. The field-free alignment revives periodically after the laser pulse is over. The revival structure can be modified by a second laser pulse for the rotational wave-packet through precisely adjusting the time delays between the two laser pulses. When the laser intensity excesses the ionization threshold, ionization and Coulomb explosion occur. The atomic ions C^m＋（re=1-3） and On＋（n=1-3） observed in the experiment exhibit highly anisotropic angular distributions relative to the laser polarization. Using two linearly polarized laser pulses with crossed polarization, we conclude that the anisotropic angular distribution results from dynamic alignment, in which the rising edge of the laser pulse aligns the neutral CO2 along the laser polarization direction prior to ionization.

关键词： Rotational wave-packet Field-free alignment Coulomb explosion

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Structural Design and Property Characterization of Bi-functional Photorefractive Polymer

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Chinese Chemical Letters 1999年第8期10卷 667-670页

作者： Yi Wang CHEN Yuan Kang HE Hui Ying CHEN Feng WANG qi huang gong (College of Chemistry and Molecular Engineering, Peking University. Beijing 100871)(Physical Department. Peking University. Beijing 100871) Beijing Univ Coll Chem & Mol Engn Beijing 100871 Peoples R China Beijing Univ Dept Phys Beijing 100871 Peoples R China

A novel bi-functional photorefractive acrylate polymer with pendant carbazolyl groups and azo derivatives as side chains was synthesized. Photorefractive experiments showed a high two-beam coupling gain coefficient of... 详细信息

关键词： acrylate polymer bi-functional polymer photorefractive material

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Spectrally multiplexed and bright entangled photon pairs in a lithium niobate microresonator

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 3-9页

作者： Bo-Yu Xu Li-Kun Chen Jin-Tian Lin Lan-Tian Feng Rui Niu Zhi-Yuan Zhou Ren-Hong Gao Chun-Hua Dong Guang-Can Guo qi-huang gong Ya Cheng Yun-Feng Xiao Xi-Feng Ren CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China CAS Synergetic Innovation Center of Quantum Information&Quantum Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

On-chip bright quantum sources with multiplexing ability are extremely high in demand for integrated quantum networks with unprecedented scalability and ***,we demonstrate a bright and broadband biphoton quantum source with spectral multiplexing generated in a lithium niobate microresonator *** introducing the conventional domain poling,the on-chip microdisk produces photon pairs covering a broad bandwidth promised by natural phase matching in spontaneous parametric down ***,the multiplexed photon pairs are characterized by 30 nm bandwidth limited by the filtering system,providing over 40 multiplexing channels with a 0.8 nm channel ***,the generation rate reaches 5.13 MHz/μW with a coincidence-to-accidental ratio up to 804,and the quantum source manifests a high purity with a heralded single photon correlation g^((2))_(H)(0)=0.0098±***,the energy-time entanglement is demonstrated with an excellent interference visibility of 96.5%±2%.Such a quantum source at the telecommunication band paves the way for high-dimensional entanglement and future integrated quantum information systems.

关键词： quantum entangled source spectral multiplexing lithium niobate on insulator microresonator

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Photorefractive Effect in Poly(N-vinylcarbazole)-Based Composite Sensitised by C_(60)

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Chinese Chemical Letters 1997年第9期8卷 807-810页

作者： Zhi Jie ZHANG Yi Wang CHEN Yuan Kang HE and Hui Ying CHEN(Institute of Polymer Science, College of Chemistry, Peking University, Beijing, 100871)Zhi Jian CHEN Shu Feng WANG and qi huang gong(Department of Physics, Mesoscopic Physics Laboratory, Peking U Institute of Polymer Science College of Chemistry Peking University Beijing 100871 China Department of Physics Mesoscopic Physics Laboratory Peking University Beijing 100871 China

A new PVK-based photorefractive polymer composite sensitized by C60 and doped with a higher content of EO chromophore was prepared. The high optical quality thin-film was formed between two ITOcovered glass electrodes. Two-beam-coupling (2BC) experiment was performed by using a He-Ne laser (at wavelength 632.8nm), and an obvious photorefractive performance was observed. The dependence of two-beamcoupling gain coefficient on the applied poling dc electric field was measured.

关键词： Photorefractive Effect in Poly Based Composite Sensitised by C N-vinylcarbazole Rev

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One-year-old Fundamental Research,full steam ahead

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Fundamental Research 2022年第2期2卷 177-177页

作者： qi-huang gong School of Physics Peking UniversityBeijing 100871China

Featuring a rapid development of science and technology in the new era,Fundamental Research(FR),a comprehensive academic journal supervised and sponsored by the National Natural Science Foundation of China(NSFC),was launched in January *** aims to provide a platform for academic communication between Chinese and foreign scientists,facilitate the inter-disciplinary integration,and strengthen the worldwide academic connection.

关键词： journal NSFC academic

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