Abstract
ABSTRACTVarious nanostructures have been adopted for anti-reflection coating due to the graded refractive index. The interference between the two interfaces may sometimes cause an oscillating reflectance spectrum under certain conditions. The anti-reflection performances of a few nanostructure arrays were investigated using the finite-difference time domain (FDTD) simulation method. The study showed that the appropriate modulation of the height of nanostructures is a very effective method for suppressing the reflection peaks and flattening the reflectance spectrum.
Highlights
Efficient anti-reflection structures are very important in various applications, such as solar cells, photodetectors, and display technology [1,2], where the reflection losses should be minimized
Various nanostructures have been adopted for anti-reflection coating due to the graded refractive index
The study showed that the appropriate modulation of the height of nanostructures is a very effective method for suppressing the reflection peaks and flattening the reflectance spectrum
Summary
Efficient anti-reflection structures are very important in various applications, such as solar cells, photodetectors, and display technology [1,2], where the reflection losses should be minimized Several optical structures, such as dielectric multi-layer coating and index-matching layer, have been used for antireflection purpose. Adopting periodic nanostructures mimicking moth eyes is another efficient anti-reflection method because of such nanostructures’ grading refractive index [1,2,3,4,5]. In this case, the nanostructures in the coating layer are generally tapered, and the air fraction decreases in the coating toward the substrate. It was found that the sinusoidal modulation of the height is very effective in suppressing the reflection peaks and flattening the reflectance spectrum
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