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Dive into the research topics where Gang Sun is active.

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Featured researches published by Gang Sun.


Journal of Physics: Condensed Matter | 2005

Fabrication and optical characterization of gold-infiltrated silica opals

Wenjiang Li; Gang Sun; Fangqiong Tang; Wing Yim Tam; Jensen Tsan Hang Li; Che Ting Chan; Ping Sheng

We report the fabrication of metal-infiltrated silica opals for optical studies. Highly mono-dispersed silica microspheres are fabricated and assembled by a force packing method to form opals with large domain sizes. The opals are then infiltrated with gold by an electroplating technique. The optical properties of the infiltrated opals in the visible range are studied and model calculations based on a multiple-scattering formalism are used to interpret the experimental results. The calculated position of the directional gap of the silica opal agrees very well with experimental observation. We found that the optical properties of the infiltrated sample can be explained using a model system in which the voids in the silica opal are partially filled with Au and the surface of the slab is covered with a thin layer of Au.


Powder Technology | 2018

Dynamics of quasi-static collapse process of a binary granular column

Hongwei Zhu; Yaodong Feng; Danfeng Lu; Yahya Sandali; Bin Li; Gang Sun; Ning Zheng; Qingfan Shi

Abstract The dynamical behavior of the column that made up binary granular beads is investigated systematically by tracking the displacement of particles in the collapse process. An experimental setup is first devised to control the quasi-static collapse of a granular column, and then observe the trajectories of tracer particles by using an industrial camera controlled by the image acquisition program. It is found that there exist two zones in column: a sliding region in which particles are moving in a layered structure; a static region within which particles are stationary. According to this analytical result, a dynamical model is developed to predict the trajectory evolution of particles in the space-time. The calculating result for the trajectories of particles on the selected layers is well consistent with the experimental observation.


Modern Physics Letters B | 2014

CYCLIC SEGREGATION STATE IN VERTICALLY VIBRATED BINARY GRANULAR MIXTURES

Qingfan Shi; Beicheng Pan; Changhong Lu; Gang Sun

In this paper, the vertically vibrated binary granular mixtures at atmospheric pressure are studied experimentally. We find a nonstationary segregation state, of which the structure changes with time cyclically. The period of the cyclic segregation is measured and its variation with the vibration conditions is shown. The transition between the segregation states is also discussed, and a phase diagram on the plot of frequency against acceleration amplitude is given. In order to observe the effect of air flow in the segregation process, an alternative container with ventilated bottom is designed. Our experiments show that both regions of the Brazil nut segregation state and the cyclic segregation state shrink obviously by use of the latter container and disappear completely if the whole system is placed in vacuum. These results testify that the air pressure plays a positive role in both the Brazil nut effect and cyclic segregation.


Physical Review B | 2009

Localized and delocalized surface-plasmon-mediated light tunneling through monolayer hexagonal-close-packed metallic nanoshells

Chaojun Tang; Zhenlin Wang; Weiyi Zhang; Shining Zhu; Nai-Ben Ming; Gang Sun; Ping Sheng


Physical Review B | 2006

Optical properties of photonic crystals composed of metal-coated spheres

Jensen Tsan Hang Li; Gang Sun; Che Ting Chan


Physical Review E | 2012

Polymerlike statistical characterization of two-dimensional granular chains

Pingping Wen; Ning Zheng; Liangsheng Li; Heng Li; Gang Sun; Qingfan Shi


Physical Review E | 2006

Frequency-selective absorption characteristics of a metal surface with embedded dielectric microspheres.

Gang Sun; Che Ting Chan


Physica A-statistical Mechanics and Its Applications | 2009

Size dependence of effective mass in granular columns

Jia Liu; Qingfan Shi; Xuanwen Liang; Lei Yang; Gang Sun


Physical Review E | 2006

Relationship between the flow rate and the packing fraction in the choke area of the two-dimensional granular flow.

Decai Huang; Gang Sun; Kunquan Lu


Physical Review E | 2013

Segregation in mixtures of granular chains and spherical grains under vertical vibration

Xiaoxian Yuan; Ning Zheng; Qingfan Shi; Gang Sun; Liangsheng Li

Collaboration


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Qingfan Shi

Beijing Institute of Technology

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Ning Zheng

Beijing Institute of Technology

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Changhong Lu

Beijing Institute of Technology

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Ping Sheng

Hong Kong University of Science and Technology

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Decai Huang

Chinese Academy of Sciences

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Liangsheng Li

Beijing Institute of Technology

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Yahya Sandali

Beijing Institute of Technology

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Che Ting Chan

Hong Kong University of Science and Technology

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Cheng Xu

Beijing Institute of Technology

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Jia Liu

Beijing Institute of Technology

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