Finite Difference Time Domain Analysis of Sub-Wavelength Conical Structured Array for Antireflective Application

Hung-Yin Tsai; Chia-Jen  Ting; Kei-Lin  Kuo; Chang-Pin Chou

doi:10.6180/jase.2007.10.2.05

Finite Difference Time Domain Analysis of Sub-Wavelength Conical Structured Array for Antireflective Application

Hung-Yin Tsai This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Chia-Jen Ting^2,3, Kei-Lin Kuo⁴ and Chang-Pin Chou³

¹Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan 202, R.O.C.
²Micro and Nano Optical Film Technology Department, Mechanical and System Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 310, R.O.C.
³Mechanical Engineering Department, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.
⁴Department of Vehicle Engineering, National Taipei University of Technology, Taipei, Taiwan 106, R.O.C.

Received: February 12, 2007
Accepted: April 8, 2007
Publication Date: June 1, 2007

Download Citation: ||https://doi.org/10.6180/jase.2007.10.2.05

ABSTRACT

Antireflection structured surface was analyzed by a finite difference time domain (FDTD) method in the visible light spectrum. The antireflection structured array was conical moth-eye structures. Comparing the reflectance of different aspect ratios by the FDTD method, we found that the reflectance was less than 1% when the aspect ratio was larger than 0.8 in the visible light spectrum. In order to confirm the results by this simulation method, the conical structured arrays of a polymer film were fabricated by the holographic lithography and a following replicating process. The conical structured arrays were fabricated with the periodic length of 350 nm and the height of 300 nm. The simulation results by FDTD method were compared with those by the fabricated sub-wavelength structures. The experimental results showed highly consistent with the simulation results.

Keywords: Finite Difference Time Domain, Antireflection, Sub-Wavelength Structured Array

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