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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Subject: search.filters.subject.antireflection coatings

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Now showing 1 - 4 of 4
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    High-Transmittance 2 Electrically Tunable Terahertz Phase Shifter with CMOS-Compatible Driving Voltage Enabled by Liquid Crystals
    (2019-01-02)
    Yang, Chan-Shan
    ;
    Kuo, Chun
    ;
    Chen, Po-Han
    ;
    Wu, Wei-Ta
    ;
    Pan, Ru-Pin
    We have investigated tunable terahertz (THz) phase shifters that are based on a sandwiched liquid crystal (LC) cell with indium-tin-oxide (ITO) nanowhiskers (NWhs) as transparent electrodes. More than 360 degrees of phase shift at 1.0 THz was achieved at a driving voltage as low as similar to 2.6 V (rms). This is approximately 40 times smaller than that reported in previous works using an electrically tuned LC device. Significance of the NWhs in reducing the required voltage is demonstrated. Overall transmittance of the device is as high as 30%, which is accountable by absorption losses of ITO NWhs, quartz substrate and LC. Experimental results are in good agreement with a theoretical formulism while taking into account super-thick LC cells (similar to 1 mm) and pretilt angles. We also propose and demonstrate a novel THz technique for measuring pretilt angles of liquid crystals.
  • Thumbnail Image
    Item type:Item,
    Broadband and omnidirectional antireflection from conductive indium-tin-oxide nanocolumns prepared by glancing-angle deposition with nitrogen (Retracted article. See vol. 104, 269901, 2014)
    (2009-02-02)
    Chang, C. H.
    ;
    Yu, Peichen
    ;
    Yang, C. S.
    ;
    光電工程學系
    ;
    Department of Photonics
    Characteristic formation of highly oriented indium-tin-oxide (ITO) nanocolumns is demonstrated using electron-beam evaporation with an obliquely incident nitrogen flux. The nanocolumn material exhibits broadband and omnidirectional antireflective characteristics up to an incidence angle of 70 degrees for the 350-900 nm wavelength range for both s- and p-polarizations. Calculations based on a rigorous coupled-wave analysis indicate that the superior antireflection arises from the tapered column profiles which collectively function as a gradient-index layer. Since the nanocolumns have a preferential growth direction which follows the incident vapor flux, the azimuthal and polarization dependence of reflectivities are also investigated. The single ITO nanocolumn layer can function as antireflection contacts for light emitting diodes and solar cells.
  • Thumbnail Image
    Item type:Item,
    全固態離子型薄膜元件開發
    (2013)
    劉柏村
    ;
    Po-Tsun Liu
    ;
    國立交通大學光電工程研究所
    本計畫主要目標是發展具有奈米抗反射層(Anti-reflective coating; ARC)結構的銅銦鎵硒(Cu(In,Ga)Se2; CIGS)薄膜太陽能電池技術。利用奈米結構的抗反射層來增加光捕獲效果(Light trapping)，以提昇CIGS 太陽能電池的光電轉化效率。在此計劃中，我們不使用任何催化劑或模板來輔助薄膜成長，即可利用簡易的水熱法來合成柱狀與花瓣狀的氧化鋅奈米結構層。藉由藥品溶液的濃度、試劑的化學計量、溫度與酸鹼度(PH)的優化，我們可以控制奈米結構的尺寸和幾何形狀。最後，將氧化鋅奈米陣列應用於無硒化銅銦鎵硒薄膜太陽能電池元件的製作，以達成全波段低反射效果與提昇太陽能電池元件光電轉換效率。在整個研究的過程中，我們也嘗試將無硒化銅銦鎵硒薄膜應用在可撓式不鏽鋼基板上，作為可撓式(R2R) CIGS 薄膜太陽電池的塑膠基板材料，朝向可撓性、大面積、低耗能、低成本及環保製程為目標。
  • Thumbnail Image
    Item type:Item,
    Broadband and omnidirectional antireflection from conductive indium-tin-oxide nanocolumns prepared by glancing-angle deposition with nitrogen (Retracted article. See vol. 104, 269901, 2014)
    (2009-02-02)
    Chang, C. H.
    ;
    Yu, Peichen
    ;
    Yang, C. S.
    ;
    光電工程學系
    ;
    Department of Photonics
    Characteristic formation of highly oriented indium-tin-oxide (ITO) nanocolumns is demonstrated using electron-beam evaporation with an obliquely incident nitrogen flux. The nanocolumn material exhibits broadband and omnidirectional antireflective characteristics up to an incidence angle of 70 degrees for the 350-900 nm wavelength range for both s- and p-polarizations. Calculations based on a rigorous coupled-wave analysis indicate that the superior antireflection arises from the tapered column profiles which collectively function as a gradient-index layer. Since the nanocolumns have a preferential growth direction which follows the incident vapor flux, the azimuthal and polarization dependence of reflectivities are also investigated. The single ITO nanocolumn layer can function as antireflection contacts for light emitting diodes and solar cells.