Designing multilayer dielectric filter based on TiO2/SiO2 for fluorescence microscopy applications

Abstract

This study presents a new construction design of a distributed Bragg reflector (DBR) filter and a Fabry–Pérot (FP) filter by using needle technique as a synthesis method. The optimized DBR and FP filters having a proper number of layers with controlling thickness TiO2/SiO2 are utilized to transmit only a certain narrow band of wavelengths while blocking the others. As a proof of concept, the filters are designed to selectively transmit only a very narrow band of wavelength at 780 nm which is the near infrared (NIR) fluorescent emission from Alexa Fluor 750 dye. The obtained results show that the optimized filters represent advanced spectral performance which can be used to improve the sensitivity and the imaging contrast in fluorescence microscopy.

Three-periodic 1D photonic crystals for designing the photonic optical devices operating in the infrared regime

“…Thus, one can configure the transmission spectrum of the structure in order to a single transmission mode inside the PBG for each polarization at the fixed wavelength for all range of the incidence angles. Such a structure can act as a polarizationsensitive angle sensor with the given accuracy, or distributed Bragg reflector, or Fabri-Pérot filter [48]. For practical purpose we choose a PCof the structure [(ST) 7 (AZ) 1 ] 5 which possesses a single transmission peak for both TE-and TM-modes.…”