Abstract
Surface plasmon resonance (SPR) sensor is widely used for its high precision and real-time analysis. Fiber-optic SPR sensor is easy for miniaturization, so it is commonly used in the development of portable detection equipment. It can also be used for remote, real-time, and online detection. In this study, a wavelength modulation fiber-optic SPR sensor is designed, and theoretical analysis of optical propagation in the optical fiber is also done. Compared with existing methods, both the transmission of a skew ray and the influence of the chromatic dispersion are discussed. The resonance wavelength is calculated at two different cases, in which the chromatic dispersion in the fiber core is considered. According to the simulation results, a novel multi-channel fiber-optic SPR sensor is likewise designed to avoid defaults aroused by the complicated computation of the skew ray as well as the chromatic dispersion. Avoiding the impact of skew ray can do much to improve the precision of this kind of sensor.
Highlights
With rapid advances of the fabrication technology and transmission theory, optical fiber, which is a medium for long-distance optical transmission, has been extensively used in chemical and biomedical sensing fields [1,2]
In order to improve the sensitivity of fiber-optic surface plasmon resonance (SPR) sensor, most existing theoretical analysis and experimental methods are tried to change the shape of sensing region [28], or change some parameters such as numerical aperture (NA), ratio of sensing region length to fiber core diameter, total bimetallic thickness, maximum absorption wavelength, and half maximum width of the sensing medium [29,30]
A theoretical model of the light transmitting within a fiber-optic SPR sensor is set up
Summary
With rapid advances of the fabrication technology and transmission theory, optical fiber, which is a medium for long-distance optical transmission, has been extensively used in chemical and biomedical sensing fields [1,2]. In 1993, Jorgenson and his colleagues [6] succeeded in the SPR detection by using optical fiber as the guide medium of light They proposed two fiber-based SPR sensor devices and established a viable fiber-optic SPR sensor technology. Theoretical analysis of fiber-optic SPR sensors is based on a simplified model [20], where the effect of the propagation of the skew ray, which occupies the most part of the light beam, is not considered. According to the theoretical analysis, a novel wavelength modulation multi-channel fiber-optic SPR sensor is proposed. This novel design cannot only overcome the defect of optical chromatic dispersion, and simplify the calculation of the optical path. High-accuracy multi-channel fiber-optic SPR sensor may be achieved
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