Numerical analysis of a photonic crystal fiber based on two polarized modes for biosensing applications

Abstract

This paper presents a theoretical study on a photonic crystal fiber plasmonic refractive index biosensor. The proposed photonic crystal fiber sensor introduces the concept of simultaneous detection with the linearly polarized and radially polarized modes because the sensing performance of the sensor based on both modes is relatively high, which will be useful for selecting the modes to make the detection accurately. The sharp single resonant peaks of the linearly polarized mode and radially polarized mode, are stronger and more sensitive to the variation of analyte refractive index than that of any other polarized mode in this kind of photonic crystal fiber. For linearly polarized mode and radially polarized mode, the maximum sensitivities of 10448.5 nm per refractive index unit and 8230.7 nm per refractive index unit can be obtained, as well as 949.8 and 791.4 for figure of merits in the sensing range of 1.33-1.45, respectively. Compared with the conventional Au-metalized surface plasmon resonance sensors, our device is better and can be applied as a biosensor.

Symmetrical dual D-shape photonic crystal fibers for surface plasmon resonance sensing

“…The spectral width and signal-to-noise ratio are two other performance parameters that affect the detection limit. They can be described using the widely accepted figure of merits (FOM) [35,36]:…”

“…where m is the slope of resonance peak position per refractive index unit and FWHM is the full-width at half-maximum of the resonance peak. A larger FOM means a better detection limit [35]. Figure 12 shows the dependence of FOM for the two sensors on the analyte refractive indexes.…”

Infiltrated Photonic Crystal Fibers for Sensing Applications

“…The results were sensitives both positive and negative, 3600 nm/RIU for a range of 1.45–1.46 and −5500 nm/RIU for a range of 1.50–1.53, respectively. The use of only the central core was proposed in [207]. A sensitivity of 10,448.5 nm/RIU in the RI range 1.33–1.45 was demonstrated.…”

Flat-topped hollow laser beams can be obtained by using the multi-core photonic crystal fiber mixed with GeO2

“…Zhang et al [15] produced a hollow laser beam with the property of six rotational symmetry by selectively filling liquids into PCF, but they didn't involve the discussion on dark spot size and laser intensity, what' s more, it is hard to control if we take the property of liquid into account. In addition, someone tried to produce hollow laser beam by filling metal [16] into PCF, whereas the technology that filling liquid or metal in fiber-optical drawing is difficult and of high cost. Most important of all, the produced hollow laser beams all have laser intensity of Gaussian distribution no matter what kind of methods we adopted above.…”