Optimal Design of D-type Plastic Fibers for best sensitivity of SPR Sensors

Abstract. A design method for a SPR (surface plasmon resonance) sensor based on a D-type plastic optical fiber (POF) geometry in a configuration of a multi-layered scheme is proposed in this paper. The numerical simulation for the optimal sensitivity with spectral interogation was performed in order to choose the practical implementation geometry of the SPR sensor. A side-polish to the half of the fiber's PMMA core, with about 10mm in length is made and a Microposit 1813 buffer and gold layer deposition is used for sample fabrication. The effect of different thickness of the layers in different multi-layered configuration has been investigated. The proposed setup for sensor test, measures the light intensity instead of phase difference. It can be used for refractive index changes (1.33-1.40) in real time detection of the substances for different biosensing applications. The proposed sensor is simple to use, has small size, it works on small analyt-sample size and it is cost effective for specific non-invasive application users

Optimal Design of D-Type Plastic Fibers for Best Sensitivity of SPR Sensors

A design method for a SPR (surface plasmon resonance) sensor based on a D-type plastic optical fiber (POF) geometry in a configuration of a multi-layered scheme is proposed in this paper. The numerical simulation for the optimal sensitivity with spectral interogation was performed in order to choose the practical implementation geometry of the SPR sensor. A side-polish to the half of the fiber's PMMA core, with about 10mm in length is made and a Microposit 1813 buffer and gold layer deposition is used for sample fabrication. The effect of different thickness of the layers in different multi-layered configuration has been investigated. The proposed setup for sensor test, measures the light intensity instead of phase difference. It can be used for refractive index changes (1.33-1.40) in real time detection of the substances for different biosensing applications. The proposed sensor is simple to use, has small size, it works on small analyt-sample size and it is cost effective for specific non-invasive application users

Plasmonic Sensing in D-Shaped POFs with Fluorescent Optical Fibers as Light Sources

We present a new experimental investigation about the possibility to use fluorescent optical fibers as light sources, instead of halogen lamps, for plasmonic sensing. The novel configuration has been first introduced, and then the components' properties and the experimental results have been illustrated. Two sensor systems have been realized and characterized by exploiting red and blue fluorescent optical fibers to illuminate different plasmonic sensors and observe the transmitted spectra by a spectrometer. In particular, the plasmonic sensors have been realized with two different metals, gold and silver, sputtered on D-shaped plastic optical fibers (POFs) with an optical buffer layer between the metal film and the POF core. We have matched the metal's plasmonic resonance wavelength with the emission of a specific fluorescent optical fiber. The good quality of the experimental results, the low-power consumption, the low cost, the remote sensing capability, the small size, and the simple scheme of the configuration make this strategy a potentially suitable diagnostic tool for biosensing applications