Bio-molecular sensors based on guided mode resonance filters

14th International Symposium on Advanced Materials

Saleem, M.R.^1,2 ; Ali, R.^1 ; Honkanen, S.^1 ; Turunen, J.^1

Institute of Photonics, University of Eastern Finland, P.O. Box 111, Joensuu

FI-80101, Finland^1

Center for Advanced Studies in Energy (CAS-EN), National University of Sciences and Technology, postal code 44000, Sector H-12, Islamabad, Pakistan^2

关键词: Biomolecular sensors;    Corrugated structures;    Fourier modal method;    Guided mode resonance filters;    High refractive index;    Low surface roughness;    Nanophotonic structures;    Waveguide structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/146/1/012030/pdf
DOI  :  10.1088/1757-899X/146/1/012030

来源: IOP

【 摘 要 】

In this work a low surface roughness and homogenous, high refractive index, and amorphous TiO2layer on corrugated structures of diffractive optical element is coated by Atomic Layer Deposition (ALD) for biosensors. The design of Guided Mode Resonance Filters (GMRFs) is based on refractive indices and thicknesses of the waveguide biomolecular layers. The designed spectral shifts are calculated by Fourier Modal Method (FMM) and depend on the magnitude of the variations in refractive index of the biomolecular layer on waveguide structures. Furthermore, the sensitivity of the biomolecular sensors depends on the thickness of biomolecular layer and periodicity of the structures. The waveguide structures designed for larger periods show an enhancement in the sensitivity (nm/RIU) of the biomolecular sensor at longer wavelengths. The periodicities of nanophotonic structures are varied from 300 to 500 nm in design calculations with predominance of increase in effective index of the structure to support leaky waveguide modes.