A reflectance-based surface plasmon resonance (SPR) fiber sensor with enhanced sensitivity for biochemical sensing is reported after comparing its result with the transmittance-based SPR optical fiber sensors. The fabricated SPR sensor contains a gold-coated multimode fiber with the implementation of a standard source-sensor-spectrometer interrogation system. As the refractive index of the liquid under test is increased, a redshift of the SPR is observed. The coupling of the source to the fiber sensor is optimized by investigating the effect of an intentional misalignment in transmission-based setup. When a fiber tip coated with the silver mirror and the bifurcated fiber bundle is used, an alignment-free disposable sensor probe is achieved. A comprehensive characterization of the proposed reflectance-based SPR probe is discussed. The maximum sensitivity of 3212.19 nm/refractive index unit (RIU) is obtained.
|Titolo:||Reflectance-based low-cost disposable optical fiber surface plasmon resonance probe with enhanced biochemical sensitivity|
|Data di pubblicazione:||2016|
|Digital Object Identifier (DOI):||10.1117/1.OE.55.4.046114|
|Appare nelle tipologie:||1.1 Articolo in rivista|