Browsing by Author "Du, Q. G."

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    Strongly linearly polarized low threshold lasing of all organic photonic quasicrystals
    (Nature Publishing Group, 2012-09-04) Luo, D.; Du, Q. G.; Dai, H. T.; Demir, Hilmi Volkan; Yang, H. Z.; Ji, W.; Sun, X. W.
    Lasing is obtained from a two-dimensional (2D) Penrose photonic quasicrystal made of a low index contrast material of holographic polymer dispersed liquid crystals (H-PDLCs) that enables a substantial reduction in the optical pumping threshold. This lasing architecture further allows for excellent linear polarization characteristics as well as wide directional dependence. The pumping threshold is fivefold lower than that obtained from the 2D defect-free photonic crystals fabricated under similar conditions. These properties make H-PDLC photonic quasicrystal promising for a new type of all organic miniature lasers.
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    A two dimensional nanopatterned thin metallic transparent conductor with high transparency from the ultraviolet to the infrared
    (American Institute of Physics, 2012-11-01) Du, Q. G.; Sathiyamoorthy, K.; Zhang, L. P.; Demir, Hilmi Volkan; Kam, C. H.; Sun, X. W.
    The optical properties of a two-dimensional nanohole patterned aluminum thin film in hexagonal lattice are studied. The transmission dip can be moved out from the visible range by manipulating the lattice constant. The resulting nanopatterned thin film is demonstrated to exhibit a high transparency in a wide wavelength range. The origins of the transmission dip and the transmission drop are explained. For constant resistance, thicker films with a larger filling ratio lead to better transmittance in the visible range. Angular response of the nanopatterned metallic film is also analyzed, and transmittances using several other metals are compared.