Mr. Qichao Wang Profile

Qichao Wang

Doctoral Candidate

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Publications (7)

Proceedings Article | 5 January 2017 Paper

Design on compatible stealth photonic crystal of near/middle infrared and 1.06 μm laser

Ji-kui Zhang, Jia-Chun Wang, Qi-Chao Wang

Proceedings Volume 10244, 102441T (2017) https://doi.org/10.1117/12.2258169

KEYWORDS: Photonic devices, Photonic crystals, Infrared radiation, Laser crystals, Mid-IR, Infrared lasers, Optical design, Physics

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In the near and middle infrared atmospheric window, infrared stealth material require a low absorptivity (which means a low emissivity according to Kirchhoff’s law of black body), at the same time, it also requires high absorptivity so as to decrease the reflectance at military laser wavelength of 1.06μm. Under this circumstances, compatible stealth of infrared and laser is an urgent demand, but the demand is ambivalent for conventional materials. Photonic crystal (PC), as a new type of artificial periodic structure function material, can realize broadband thermal infrared stealth based on its high-reflection photon forbidden band(also called photonic band gap). The high-reflection photon forbidden band of PC can be adjusted to near and middle infrared wave band through some rational methods. When a defect was added into the periodic structure of PC, a “hole-digging” reflection spectrum, which is high absorption at military laser wavelength of 1.06μm, can be achieved, so compatible stealth of near and middle infrared and military laser wavelength of 1.06μm can be achieved too.

In this paper, we selected near and middle infrared-transparent materials, Te and MgF₂ , as high refractive index and low refractive index material respectively, and designed a one-dimensional one-defect-mode PC whose photon forbidden band was broadened to 1-5μm by constructing two photonic crystals into one. The optical property of the PC was calculated by Transfer matrix method(TMM) of thin-film optical theory, and the results shows that the as-designed PC has a high spectral reflectance in the near and middle infrared band, among which the reflectivity in 1.68μm∼5.26μm band reached more than 90%, and the 2.48∼5.07μm band even reached 99.99%. The result also shows that between the band gap of 1-5μm, there are one defect mode locating in the wavelength of 1.06μm, whose reflectance is below 0.70%, which means its spectral absorptivity is greater than 99.30%. All the above we have discussed proved that this “hole-digging spectrum” PC can realize the compatible stealth of near and middle infrared and 1.06μm military laser.

Proceedings Article | 7 November 2016 Paper

Plasma radome designed for the EMP effects defense

Zhigang Li, Jiachun Wang, Li Cheng, Qichao Wang

Proceedings Volume 10141, 101410R (2016) https://doi.org/10.1117/12.2254041

KEYWORDS: Plasma, Defense and security, Electromagnetism, Radar, Weapons, Radio propagation, High power microwaves, Plasma generation, Warfare, Microwave radiation

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Proceedings Article | 19 October 2016 Paper

Extinction characteristic of graphite smoke for terahertz wave

Qi-chao Wang, Jia-chun Wang, Da-peng Zhao, Ji-kui Zhang, Hao Liu, Jia-ming Shi

Proceedings Volume 10155, 101553I (2016) https://doi.org/10.1117/12.2247383

KEYWORDS: Terahertz radiation, Absorption

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SPIE Journal Paper | 10 May 2016

Heterogeneous doped one-dimensional photonic crystal with low emissivity in infrared atmospheric window

Lei Miao, Jiaming Shi, Jiachun Wang, Dapeng Zhao, Zongsheng Chen, Qichao Wang

OE, Vol. 55, Issue 05, 057101, (May 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.5.057101

KEYWORDS: Reflectivity, Infrared radiation, Gas lasers, Photonic crystals, Silicon, Reflection, Tellurium, Thermography, Doping, Semiconducting wafers

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Proceedings Article | 15 October 2015 Paper

Study on the recognition of camouflage targets with hyper-spectral detection

Jia-chun Wang, Qi-chao Wang, Zhi-dan Lin, Da-peng Zhao, Jia-ming Shi, Zong-sheng Chen

Proceedings Volume 9674, 96742O (2015) https://doi.org/10.1117/12.2202582

KEYWORDS: Camouflage, Target recognition, Target detection, Imaging systems, Hyperspectral systems, Target acquisition, Environmental sensing, Acousto-optics, Tunable filters, Spectral resolution

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Proceedings Article | 30 August 2013 Paper

Recognition of camouflage targets with hyper-spectral polarization imaging system

Qi-chao Wang, Jia-chun Wang, Da-peng Zhao, Li-fang Ma, Zong-sheng Chen, Zhi-gang Li

Proceedings Volume 8910, 89101Q (2013) https://doi.org/10.1117/12.2034717

KEYWORDS: Polarization, Camouflage, Image fusion, Target recognition, Imaging systems, Image enhancement, Target detection, Linear polarizers, Acousto-optics, Crystals

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Proceedings Article | 23 August 2013 Paper

Anti-camouflage capacity study of THz

Jia-chun Wang, Da-peng Zhao, Jia-ming Shi, Yi-min Lu, Zong-sheng Chen, Qi-chao Wang

Proceedings Volume 8909, 890911 (2013) https://doi.org/10.1117/12.2034732

KEYWORDS: Reflectivity, Coating, Terahertz radiation, Camouflage, Infrared coatings, Signal attenuation, Refractive index, Infrared radiation, Reflection, Optical matrix switches

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Showing 5 of 7 publications

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