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Qi H.,CAS Shanghai Institute of Optics and fine Mechanics | Qi H.,Shanghai Daheng Optics and Fine Mechanics Co. | Wang Q.,CAS Shanghai Institute of Optics and fine Mechanics | Xiao X.,CAS Shanghai Institute of Optics and fine Mechanics | And 3 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

Based on the biaxial birefringent model, the structural parameters of thin film, including the principal refractive indices N1, N2, N3, the thickness d and the column angle β were determined by fitting the measured transmittance spectra for two polarizations at the normal and oblique incidence. With the glancing angle deposited technique, the sculptured tantalum oxide thin films were deposited by reactive electron beam evaporation. The structural parameters were extracted by fitting the measured spectral transmittance curves at the incident angle of 0, 20°, 30°, 45° and 60° with the simulated annealing algorithm. Besides, the tilted nano-column structure, the thickness and the column angle were obtained with the cross section of thin film, examined with scanning electron microscope. The results show that the structure parameters of sculptured thin film can be extracted from the transmittance spectra.

Bu Y.,University of Chinese Academy of Sciences | Bu Y.,CAS Shanghai Institute of Optics and fine Mechanics | Zhao Y.,CAS Shanghai Institute of Optics and fine Mechanics | Zhao Y.,Shanghai Daheng Optics and Fine Mechanics Co. | And 5 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2015

The scattered light distributions of particles with different parameters of size, shape and refractive index are simulated with Mie theory and finite difference time domain (FDTD) software. The feasibility of particle shape inversed method with scattering intensity distribution and asymmetrical factor is discussed. Based on this result, a real-time aerosol particle shape identification device (RAPSID) is developed. It can collect the forward scattered light pattern with scattering angle from 5 to 19 degree by an ICCD camera. The pattern of an 8 μm polystyrene sphere particle is approximately consistent with the result of Mie scattering calculation, which verifies the accuracy of RAPSID. The test results of RAPSID for aerosol particles with different sizes show that particles of spherical, rhabdoid and other shapes can be distinguished from scattering image and inversed calculation results. ©, 2015, Science Press. All right reserved.

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