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EDITORIAL

Shengjie(Patrick) Zhai^*, Kuntao Ye^*
Journal of Advanced Optics and Photonics, Vol.1, No.1, pp. 1-2, 2018, DOI:10.32604/jaop.2018.001.001
Abstract This article has no abstract. More >

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ARTICLE

M. Rajan Philip¹, T. H. Q. Bui¹, D. D. Choudhary¹, M. Djavid¹, P. Vu, T. T. Pham², H.-D. Nguyen³, H. P. T Nguyen^2,4*
Journal of Advanced Optics and Photonics, Vol.1, No.1, pp. 3-11, 2018, DOI:10.32604/jaop.2018.001.003
Abstract We report on the design and fabrication of high performance AlxGa1−xN nanowire ultraviolet (UV) light-emitting diodes (LEDs) on silicon substrate by molecular beam epitaxy. The emission wavelength and surface morphology of nanowires can be controlled by varying the growth parameters that include substrate temperatures and/or Aluminum/Gallium flux ratios. The devices exhibit excellent current-voltage characteristics with relatively low resistance. Such nanowire LEDs generate strong emission in the UV-B band tuning from 290 nm to 330 nm. The electroluminescence spectra show virtually invariant blue-shift under injection current from 50 mA to 400 mA, suggesting the presence of a negligible quantum-confined Stark effect.… More >

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Kuntao Ye^{1, *}, Xin Li¹
Journal of Advanced Optics and Photonics, Vol.1, No.1, pp. 13-21, 2018, DOI:10.32604/jaop.2018.001.013
Abstract Detection of scanning long wave near-infrared (NIR) signal is critical in numerous applications spanning the fields of military, industry, agriculture, environment, and medicine. In this paper, we present a low cost, high performance InGaAs-based photoelectric conversion and amplification circuit for detecting scanning NIR signal in the wavelength range of 1.0-2.0 μm. With a special focus on reducing the influence of dark current and dark current noise for improved detector efficiency and precision, this proposed circuit features a photovoltaic preamplifier, a low-pass filter, and a temperature control unit; the signal gain, the bandwidth and the noise of the entire circuit is… More >

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Marina S. Moran¹, Xin-Hua Hu¹, Jun Q. Lu^{1, *}
Journal of Advanced Optics and Photonics, Vol.1, No.1, pp. 23-34, 2018, DOI:10.32604/jaop.2018.001.023
Abstract Several methods, including the azimuthally-averaged angular distribution of the scattered light intensity, two bi-parameter scatter plots and three image texture analysis algorithms of the Haralick features, Laws energy measures, and Gabor filters, are compared for their effectiveness in correlating changes in light scattering patterns from biological cells to variations in their morphological features. A series of analytic cell models with variations in main cell structure and mitochondrial characteristics are created to imitate biological cells of different structural attributes. Numerical simulations of light scattering are performed using the discrete dipole approximation (DDA). Our results show that Gabor filter analysis combined with… More >

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FengJie He¹, HuiLong Liu¹, XingLiang Xiong¹, Shengjie Zhai^{2, *}
Journal of Advanced Optics and Photonics, Vol.1, No.1, pp. 35-51, 2018, DOI:10.32604/jaop.2018.001.035
Abstract In this paper, we attempt to show that contacting aqueous solution made of either kosmotropic or chaotropic ions within a certain concentration range can trigger concentrationdependent transitions of the nematic liquid crystal (LC) at the aqueous-LC interface, going from planar to homeotropic. The effects of different ions (both anions and cations) with different concentrations on the LC orientation have thus been investigated. Nearly every ion, irrespective of being chaotrope or kosmotrope, is found to have its critical concentration, and upon reaching this concentration, homeotropic alignment in LC can be induced. Most chaotropic ions, however, induce homeotropic alignment in LC with… More >

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ARTICLE

Jian Ni¹, Mei Yang¹, Shengjie Zhai^1,2, Yingtao Jiang^1*
Journal of Advanced Optics and Photonics, Vol.1, No.1, pp. 53-69, 2018, DOI:10.32604/jaop.2018.001.053
Abstract Dust accumulation on the surface of solar photovoltaic (PV) panels can significantly decrease the amount of solar irradiance reaching the cells, and consequently, can negatively impact the amount of electricity generated. In the literature, there have been quite a few theoretical or empirical studies to model the impacts of dust on solar power generation, but little has been done to “observe” and model the process of how dust gets to solar cells in the first place and appreciate the major ambient factors that are related to dust accumulation. This paper attempts to bridge that gap by building such a photoelectrical… More >

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