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Optical microcavity： from fundamental physics to functional photonics devices

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Science Bulletin 2016年第3期61卷 185-186页

作者： Yun-Feng Xiao qihuang gong State Key Laboratory for Mesoscopic Physics and School ofPhysics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China

Optical microcavities have attracted strong research interests,for their unique property of confining photons for a long time in small volumes,which significantly enhances light–matter interaction[1].In recent decades,various fabrication techniques of microcavities with higher quality factors(Q)and smaller mode volumes(V_m)have been developed,pushing forward studies from fundamental physics to functional photonics *** optomechanics provides an ideal platform for exploring the quantum nature of macroscopic objects[2]。

关键词：光学微腔光子器件物理功能量子信息处理时间性能相互作用制造技术质量因素

Coupling-induced excitation of a forbidden surface plasmon mode of a gold nanorod

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Science China(Physics,Mechanics & Astronomy) 2009年第8期52卷 1129-1138页

作者： YAO HaoMin LI Zhi gong qihuang State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China

Using the finite-difference time-domain(FDTD) method,we simulate the coupling between a gold nanorod and gold nanoparticles with different plasmonic resonant frequencies/volumes as well as that between the nanorod and a dielectric *** influences of coupling with different nanoparticles on the excitation of a forbidden longitudinal surface plasmon mode of the nanorod under normal incidence are *** is found that the cause of this excitation is the broken symmetry of the local electric field experienced by the nanorod resulting from the charge pileup on the other *** result is valuable for understanding the near-field optical characterization of plasmonic metal nanoparticles.

关键词： localized surface plasmon resonance gold nanoparticles near-field optical microscopy coupling symmetry breaking

High-dimensional quantum information processing on programmable integrated photonic chips

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Science China(Information Sciences) 2023年第8期66卷 5-22页

作者： Yulin CHI Yue YU qihuang gong Jianwei WANG State Key Laboratory for Mesoscopic Physics School of Physics Peking University Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter Peking University Peking University Yangtze Delta Institute of Optoelectronics Collaborative Innovation Center of Extreme Optics Shanxi University Hefei National Laboratory

This study reviews the recent progress of high-dimensional quantum information processing with photons. We first introduce the basic language of high-dimensional quantum information, including the representation of quantum dits(qudits), unitary operations of qudit states, and the general format of quantum algorithms with qudits. We discuss experimental implementations of high-dimensional quantum information processing and quantum computing in photonic systems, particularly in integrated quantum photonic platforms. We also discuss how qudit-based quantum photonic devices and systems can be adopted for further improving qubit-based quantum computation and quantum simulation.

关键词： high-dimensional quantum information processing quantum computation integrated quantum photonics

OPTICAL FIELD INDUCED CIRCULAR BIREFRINGENCE DUE TO COLLISION-INDUCED ZEEMAN COHERENCE IN Sm VAPOR

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Chinese Physics Letters 1990年第9期7卷 391-393页

作者： gong qihuang ZOU Yinghua LIN Zhouting Department of Physics Peking UniversityBeijing 100871 Department of Radio-Electronics Peking UniversityBeijing 100871

An optical field induced circular birefringence due to collision-induced Zee-man coherence in Sm with He has been *** integrated intensity and linewidth of the signal have been measured as a linear function of buffer ... 详细信息

关键词： EFR collision circular

Ultrahigh spatiotemporal resolved spectroscopy

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Science China(Physics,Mechanics & Astronomy) 2007年第6期50卷 681-690页

作者： LI Zhi ZHANG JiaSen YANG Jing gong qihuang Department of Physics and State Key Laboratory for Mesoscopic Physics Peking UniversityBeijing 100871China

We review the technique and research of the ultrahigh spatiotemporal resolved spectroscopy and its applications in the field of the ultrafast dynamics of mesoscopic systems and nanomaterials. Combining femtosecond time-resolved spectroscopy and scanning near-field optical microscopy (SNOM),we can obtain the spectra with ultrahigh temporal and spatial resolutions simultaneously. Some problems in doing so are discussed. Then we show the important applications of the ultrahigh spatiotemporal resolved spectroscopy with a few typical examples.

关键词： ultrahigh spatiotemporal resolved spectroscopy femtosecond near-field spectroscopy scanning near-field optical microscopy (SNOM) femtosecond time-resolved nanomaterial

Preparation, characterization and nonlinear optical properties of colloidal gallium arsenide nanocrystals

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Rare Metals 2006年第2期25卷 118-123页

作者： LIU Zhengang LIU Chunling LI Quanshui CHEN Zhijian gong qihuang Department of Physics ＆ State Key Laboratory for Mesoscopic Physics Peking University Beijing 100871 China

GaAs nanocrystals were prepared via a simple mechanical ball milling technique. The prepared GaAs nanocrystals have high purity and could form colloidal ethanol suspension without any surfactant additives. The colloidal GaAs nanocrystal suspension displayed excellent two-photon absorption property over the visible and near-infrared region from 490 nm to 1064 nm, which enables it to become a promising broadband optical limiting material.

关键词： gallium arsenide nanocrystals nonlinear optics ball milling technique

Signal and reference wave dually encrypted digital holographic system

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Chinese Science Bulletin 2008年第19期53卷 2935-2939页

作者： ZHU YiChao ZHANG JiaSen gong qihuang State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China

We propose a secure digital holographic system with signal and reference waves dually encrypted. Two random phase masks are used to encrypt the images in the input and the Fourier planes. The reference beam is phase encoded by another random phase mask. The encrypted image and the key are recorded by a CCD camera. The data can be processed or transferred directly by computer. We theoretically and experimentally demonstrate encryption and decryption of multiple images and the results show a high quality and good fault tolerance.

关键词：光学密码数字全息术信号

Robust and high-speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference

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Opto-Electronic Advances 2020年第8期3卷 23-29页

作者： Wei Liu Dashan Dong Hong Yang qihuang gong Kebin Shi State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

The rotation control of particles in optical tweezers is often subject to the spin or orbit angular momentum induced optical torque,which is susceptible to the mechanical and morphological properties of individual *** we report on a robust and high-speed rotation control in optical tweezers by using a novel linear polarization synthesis based on optical heterodyne interference between two circularly polarized lights with opposite *** synthesized linear polarization can be rotated in a hopping-free scheme at arbitrary speed determined electronically by the heterodyne frequency between two laser *** experimental demonstration of a trapped vaterite particle in water shows that the precisely controlled rotation frequency of 300 Hz can be *** proposed method will find promising applications in optically driven micro-gears,fluidic pumps and rotational micro-rheology.

关键词： polarization modulation optical heterodyne optical tweezers optical rotation

Ultafast organic nonlinear optical molecules and the realization of mesoscopic photonic devices

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Chinese Science Bulletin 2010年第20期55卷 2111-2121页

作者： gong qihuang HU XiaoYong YANG Hong WANG ShuFeng State Key Laboratory for Mesoscopic Physics & Department of Physics Peking University Beijing 100871 China

In the twentieth century,revolutionary changes took place in the human society and people's life-style due to the improvement of the optoelectronic information technology based on the second-order nonlinear optical effects,such as the electro-optic effect,the second harmonic generation(SHG),and so *** with the rapid development of light information technology,new principles and methods of nonlinear optics are needed,and the third-order nonlinear optical effects attract great *** research progress of nonlinear optics is reviewed in this *** research work on the third-order nonlinear optical materials,ultrafast and low-power organic all-optical photonic crystal switching are introduced.

关键词：有机非线性光学光子器件三阶非线性光学效应二阶非线性光学效应非线性光学材料介观分子技术改进