A finite element method is used to analyze the per- formance of a microstructured optical fiber-based surface plasmon resonance sensors aimed for biomedical applications, such as the detection of blood carried species. Birefringence obtained by removing of a row of holes in a two-ring hexag- onal lattice of holes in a gold covered silica fiber leads to a relatively high sensitivity of the fiber optical response to a refractive index of the analyte surrounding the fiber. This fiber structure supports two types (I and II) of resonant modes. In these modes, there is an opposite variation of some sensing parameters with the increase of the refractive index of the analyte between 1.36 and 1.39. Thus, for a smaller value (1.36) of the refractive index of the analyte na, the resonance spectral width δλ0.5 is large for the core mode I and small for the core mode II but for a larger value (1.39) of na, δλ0.5 is small for the core mode I and large for the core mode II. Also, for na = 1.36, the amplitude sensitivity SA is small for the core mode I and large for the core mode II but for na = 1.39, SA is large for the core mode I and small for the core mode II. By adjusting the radius of the gold layer, the proposed sensor shows high spectral sensitivity Sλ and narrow δλ0.5 at the same resonance wavelength and na (1.39) where the figure of merit (FOM) is very large in comparison with the most recently published values.
|Titolo:||Simulation of the Sensing Performance of a Plasmonic Biosensor Based on Birefringent Solid-Core Microstructured Optical Fiber|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||10.1007/s11468-016-0342-y|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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