Biomedical bandpass filter for fluorescence microscopy imaging based on TiO2/SiO2 and TiO2/MgF2 dielectric multilayers

被引:10
作者
Butt, M. A. [1 ]
Fomchenkov, S. A. [1 ,2 ]
Ullah, A. [3 ]
Verma, P. [1 ]
Khonina, S. N. [1 ,2 ]
机构
[1] Samara State Aerosp Univ, Moskovskoye Shosse 34, Samara 443086, Russia
[2] Russian Acad Sci, Image Proc Syst Inst, Molodogvardeyshaya 151, Samara 443001, Russia
[3] BUITEMS, Dept Elect Engn, Quetta, Pakistan
来源
3RD INTERNATIONAL SCHOOL AND CONFERENCE ON OPTOELECTRONICS, PHOTONICS, ENGINEERING AND NANOSTRUCTURES (SAINT PETERSBURG OPEN 2016) | 2016年 / 741卷
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1088/1742-6596/741/1/012136
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We report a design for creating a multilayer dielectric optical filters based on TiO2 and SiO2/MgF2 alternating layers. We have selected Titanium dioxide (TiO2) for high refractive index (2.5), Silicon dioxide (SiO2) and Magnesium fluoride (MgF2) as a low refractive index layer (1.45 & 1.37) respectively. Miniaturized visible spectrometers are useful for quick and mobile characterization of biological samples. Such devices can be fabricated by using Fabry-Perot (FP) filters consisting of two highly reflecting mirrors with a central cavity in between. Distributed Bragg Reflectors (DBRs) consisting of alternating high and low refractive index material pairs are the most commonly used mirrors in FP filters, due to their high reflectivity. However, DBRs have high reflectivity for a selected range of wavelengths known as the stopband of the DBR. This range is usually much smaller than the sensitivity range of the spectrometer range. Therefore a bandpass filters are required to restrict wavelength outside the stopband of the FP DBRs. The proposed filter shows a high quality with average transmission of 97.4 % within the passbands and the transmission outside the passband is around 4 %. Special attention has been given to keep the thickness of the filters within the economic limits. It can be suggested that these filters are exceptional choice for florescence imaging and Endoscope narrow band imaging.
引用
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页数:5
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