Lesson 15 – Grating Simulation

Gratings Created with VB Script

Grating layouts in most cases are the periodic structure. There are two ways in OptiFDTD to realized the periodic layout: PBG editor and VB scripting, PBG layout and corresponding simulations are discussed in Lesson 3, Lesson 11 – 14. This lesson will focus the following features: •     Using VB scripting to generate the grating (or…

Transmission and Reflection Spectrum from Grating Unit Cell

Silicon subwavelength gratings on quartz substrates can function as a color filter. This has been shown the following published paper: [1]           Yoshiaki Kanamori, Masaya Shimono, and Kazuhiro Hane, “Fabrication of Transmission Color Filters Using Silicon Subwavelength Gratings on Quartz Substrates”, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 18, NO. 20, OCTOBER, 2006, pp. 2126-. The layout sketch taken…

Diffraction Efficiency and Diffraction Angle Based on Grating Unit Cell

This part shows how to extract the diffraction angle and diffraction efficiency based the FDTD near field simulation and far-field transform. The simulation concept is to use the FDTD method to get the near field pattern and near field transmission and reflection. The diffraction angle and power ratio for different diffraction beam can be evaluated from…