A SILVER-COATED SINUSOIDAL SUB-WAVELENGTH STRUCTURE WITH POLARIZATION FEATURE FOR LIGHT EMITTING DIODE

Cheng-Hao Ko, Jian-Shian Lin, Chang-Tai Chen () and Nien-Po Chen
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Cheng-Hao Ko: Graduate Institute of Automation and Control, National Taiwan University of Science and Technology, Taipei 106, Taiwan
Jian-Shian Lin: Department of Electro-Optical Engineering, Yuan Ze University, Chungli, Taoyuan 320, Taiwan
Chang-Tai Chen: Department of Electrical Engineering, Yuan Ze University, Chungli, Taoyuan 320, Taiwan
Nien-Po Chen: Department of Electro-Optical Engineering, Yuan Ze University, Chungli, Taoyuan 320, Taiwan

Surface Review and Letters (SRL), 2009, vol. 16, issue 04, 631-634

Abstract: A two-dimensional sub-wavelength grating (SWG) is fabricated on light-emitting diodes (LEDs). The SWG is simulated by finite-difference time-domain (FDTD) method. The SWG surface has silver-coated dielectric materials with sinusoidal structures, 175 nm period and 125 m depth of groove. When the incident wave is in the red light region of 600–700nm, the transmission efficiency of TM propagated light will reach 0.82. If this SWG structure is applied in LCD direct backlight module, the lower polarization piece can be replaced and fluorescence efficiency of LED can be improved.

Keywords: Sub-wavelength; light-emitting diodes; polarization; finite-difference time-domain; silver-coated; red region (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012998

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