Pattern Simulation for Optical Edge Filter Using Octive Software

Abstract

Optical filter provides some features of special functions to either block a specific wavelength or range of wavelengths and transmit the rest of the spectrum. A lot of researcher attention have been called for the past few decades.  Recently, optical filter based on multilayer coating are more focused due to potential to manipulate filter properties by changing layer thickness in order to apply in various fields. Therefore, in this study aims to design optical edge filter-based Quarter wave stack model using optical matrix methods in GUNU Octave software. Prior to the design, molybdenum sulphide and silicon (MoS2 and Si) are being selected for high (H) and low (L) refractive index materials respectively. The optimum twenty-four (24) number of layers are determined by calculating maximum transmittance obtained. The Rayleigh wavelength (λ_ex) of 405 nm and 532 nm were selected and ‘glass|12HL|air’ configuration was set for the design simulation.  Then, the cut-on wavelength (λ_(cut-on)) and cut-off wavelength (λ_(cut-off)) of successful designed optical edge filter were measured. The result shows that the cut-on wavelength of 408.11 nm, 536 nm with minimum effective transmission (MET) of 32.3% and 31.3% respectively were obtained.