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Dive into the research topics where Jianda Shao is active.

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Featured researches published by Jianda Shao.


Applied Optics | 2005

Far-field intensity distribution and M 2 factor of hollow Gaussian beams

Degang Deng; Xiaoyong Fu; Chaoyang Wei; Jianda Shao; Zhengxiu Fan

The far-field intensity distribution of hollow Gaussian beams was investigated based on scalar diffraction theory. An analytical expression of the M2 factor of the beams was derived on the basis of the second-order moments. Moreover, numerical examples to illustrate our analytical results are given.


Optics Letters | 2009

Nonpolarizing guided-mode resonance filter

Xiaoyong Fu; Kui Yi; Jianda Shao; Zhengxiu Fan

A normal-incidence nonpolarizing guided-mode resonance filter is designed. There are two waveguide layers and one grating layer in the filter. By adjusting the distance between the two waveguide layers, the same resonance wavelength for both TE and TM polarization can be achieved. An antireflection design method is also used to decrease the sideband reflection of the filter. The results show that the filter has high reflection, more than 99.9% at 500 nm, and the FWHMs of TE- and TM-polarized light are 2.16 and 0.15 nm, respectively.


Optics Letters | 2006

Electric field enhancement in guided-mode resonance filters

Chaoyang Wei; Shijie Liu; Degang Deng; Jian Shen; Jianda Shao; Zhengxiu Fan

Electric fields inside guided-mode resonance filters (GMRFs) may be intensified by resonance effects. The electric field enhancement is investigated in two GMRFs: one is resonant at normal incidence, the other at oblique incidence. It is shown that the two GMRFs exhibit different behaviors in their electric enhancement. Differences between the electric field distributions of the two GMRFs arise because coupling between counterpropagating modes occurs in the first case. It is also shown that the order of the electric field of maximum amplitude can be controlled by modulation of the dielectric constant of the grating.


Optics Letters | 2004

Employing oxygen-plasma posttreatment to improve the laser-induced damage threshold of ZrO 2 films prepared by the electron-beam evaporation method

Dongping Zhang; Jianda Shao; Dawei Zhang; Shuhai Fan; Tianya Tan; Zhengxiu Fan

ZrO2 films are deposited by the electron-beam evaporation method. Parts of the prepared samples are post-treated with oxygen plasma at the environment temperature. The laser-induced damage threshold (LIDT) of the films increases from 15.9 to 23.1 J/cm2 after treatment with oxygen plasma. Compared with that of the as-grown samples, significant reduction of the average microdefect density and absorption are found after oxygen-plasma posttreatment. These results indicate that the oxygen-plasma posttreatment technique is an effective and simple method for reducing the microdefect density and absorption to improve the LIDT.


Optics Letters | 2010

Optimization design of an ultrabroadband, high-efficiency, all-dielectric grating.

Jianpeng Wang; Yunxia Jin; Jianda Shao; Zhengxiu Fan

More than 97% flat-top diffraction efficiency in the -1st-order TE polarization over a 110 nm wavelength range around 800 nm in an all-dielectric grating is designed by a simulated annealing algorithm and the Fourier mode method. Its band is near to the maximum bandwidth provided by a dielectric high-reflectivity mirror under the match layer. This result will provide a way for high-efficiency chirped-pulse amplification to be used in an ultrashort high-power pulse laser system based on all-dielectric gratings. Furthermore, an effective method for broadband high-efficiency all-dielectric grating design is presented in this Letter.


Journal of The Optical Society of America B-optical Physics | 2007

Comparison of femtosecond and nanosecond laser-induced damage in HfO2 single-layer film and HfO2-SiO2 high reflector

Lei Yuan; Yuanan Zhao; Guangqiang Shang; Chengren Wang; Hongbo He; Jianda Shao; Zhengxiu Fan

HfO2 single layers, 800 run high-reflective (HR) coating, and 1064 ran HR coating were prepared by electron-beam evaporation. The laser-induced damage thresholds (LIDTs) and damage morphologies of these samples were investigated with single-pulse femtosecond and nanosecond lasers. It is found that the LIDT of the HfO2 single layer is higher than the HfO2-SiO2 HR coating in the femtosecond regime, while the situation is opposite in the nanosecond regime. Different damage mechanisms are applied to study this phenomenon. Damage morphologies of all samples due to different laser irradiations are displayed. (c) 2007 Optical Society of America.


Optics Letters | 2014

High-efficiency, broad-bandwidth metal/multilayer-dielectric gratings

Heyuan Guan; Hui Chen; Jianbo Wu; Yunxia Jin; Fanyu Kong; Shijie Liu; Kui Yi; Jianda Shao

We report on an 800 nm center-wavelength metal/multilayer-dielectric grating (MMDG) with broadband, high diffraction efficiency. The trapezoidal grating ridge consists of an HfO2 layer sandwiched between two SiO2 films. Combining the advantages of SiO2 and HfO2, the grating ridge reduces the difficulties of grating ridge attainment. For such a configuration, high-performance MMDG can be successfully fabricated using the existing technology. Experimentally we demonstrated a 163 nm bandwidth MMDG with -1st-order diffraction efficiency greater than 90%. The fabricated MMDG achieved high performance as the design with large fabrication tolerances.


Applied Optics | 2005

Nonpolarizing and polarizing filter design.

Hongji Qi; Ruijin Hong; Kui Yi; Jianda Shao; Zhengxiu Fan

We describe a nonpolarizing filter design at oblique incidence and a polarizing filter design at normal incidence that use a uniaxially anisotropic layer. The phase thicknesses and the optical admittances of the layers are compensated for by the birefringent properties of a thin film at oblique incidence. This concept can be applied to the design of nonpolarizing bandpass and edge filters at oblique incidence and of polarizing beam splitters at normal incidence. Besides, the dependence of narrow-bandpass filters on normal incidence is discussed.


Applied Optics | 2005

Measurements of light scattering from glass substrates by total integrated scattering

Haihong Hou; Kui Yi; Shuzhen Shang; Jianda Shao; Zhengxiu Fan

A total integrated scattering (TIS) measurement was performed to investigate the surface and volume scattering of K9 glass substrates with low reflectance. Ag layers with thicknesses of 60 nm were deposited on the front and back surfaces of the K9 glass substrates by the magnetron sputtering technique. Surface scattering of the K9 glass substrate was obtained by the TIS measurement of the Ag layers on the assumption that the Ag layers and the K9 substrate had the same surface profile. Volume scattering of the substrates was deduced by subtracting the front and back surface scattering from the total scattering of the substrates.


Journal of Applied Physics | 2004

Electrical transport in metallic films

Ping Fan; Kui Yi; Jianda Shao; Zhengxiu Fan

On the basis of the Boltzmann equation, the authors propose a model that includes scattering from both film surfaces and grain boundaries, and have studied the quasiclassical electrical transport in metallic films. The in-plane electric conductivity of metallic films is obtained, and the theoretical results are shown to be in good agreement with experimental data. We also give the relation between temperature coefficient of resistivity and thickness of metallic films and make a comparison with experiment. 2004 American Institute of Physics.

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Zhengxiu Fan

Chinese Academy of Sciences

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Kui Yi

Chinese Academy of Sciences

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Hongbo He

Chinese Academy of Sciences

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Yuanan Zhao

Chinese Academy of Sciences

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Yunxia Jin

Chinese Academy of Sciences

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Hongji Qi

Chinese Academy of Sciences

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Meiping Zhu

Chinese Academy of Sciences

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Chaoyang Wei

Chinese Academy of Sciences

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Shijie Liu

Chinese Academy of Sciences

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Dawei Li

Chinese Academy of Sciences

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