Optical bandpass filter with adjustable reflection using a thin-film thickness for surgical fluorescein image-guided microscopy applications

Abstract

Interference noise rejection of an optical bandpass filter (BPF) with an adjustable thin-film thickness using titanium oxide (Ti3O5), silicon dioxide (SiO2), and a glass substrate for high-performance surgical fluorescein image-guided microscopy applications is achieved, and the details are presented herein. In general, a conventional surgical microscope utilizes a beam splitter due to interference noise rejection. However, this microscope is limited by a low-quality resolution and high attenuation of fluorescein images. The image resolution is typically inadequate for diagnosis and the interference noise could be directed to the surgical microscope when a filter is used. The wavelength of the laser which is used is 780-785 nm and the transmission and reflection of the fabricated BPF used in this investigation are 95% and 5% in the wavelength range of 815-872 nm and the optical density is within 1.0.