Slice and Rearrange to Form Quarter Wavelength Plates: Numerical Simulation in One Dimension
Chi-Chang Chang, Shin-Ku Lee, Mingtsu Ho, and Chenyu Chen
(Received July 6, 2018; Accepted October 18, 2018)
Keywords: method of characteristics, quarter wavelength, antireflective glass
In this paper, the computational results of numerical simulations for newly proposed structures combining two quarter wavelength (QW) slabs in one dimension are presented. The new QW plate is composed of alternate layers of two different QW slabs that are made of nonmagnetic dielectric materials A and B, respectively characterized by dielectric constants εrA and εrB which satisfy the relation (εrA)2 = εrB > 1 in order to minimize the reflection from the structures. Slabs A and B are in theory uniformly sliced into N+1 and N pieces, respectively, or vice versa. They are then respectively rearranged into two different structures, A(BA)N and B(AB)N, which are numerically proved to function as QW plates. Compared with the traditional antireflection coating techniques, the newly proposed structures have the advantages that every component of each type of material is identical in thickness and that they are easy to assemble. The idea of the proposed structures is numerically supported by simulation results obtained through the application of the method of characteristics (MOC). The wavelength of interest is set to 550 nm, corresponding to green light. The numerical results, in both the time and frequency domains, demonstrate that the proposed structures function as antireflective glasses that are straightforwardly fabricated, can be used to increase the energy efficiency and reduce the environmental impact of buildings, and to enhance the performance of some wavelength-sensitive optical sensors. It also can be used as a new coating material for solar panel to single out the specific wavelength of light and hence to protect the solar panel from infrared and ultraviolet radiations.
Corresponding author: Shin-Ku Lee and Mingtsu Ho