Abstract
By using a twin-core fiber (TCF), we propose and demonstrate a novel distributed SPR sensor, which employs both the time division multiplexing (TDM) technology and the wavelength division multiplexing (WDM) technology together. The proposed sensor has two sensing passages with four sensing channels (and there are two sensing channels in each sensing passage). We employ the TDM technology to realize the two passage distributed sensing, which are parallel-connection; and we employ the WDM technology to realize the distributed sensing of two channels in a sensing passage, which are series-connected. In order to realize the TDM technology, we employ a two-core fiber, which has two cores in a same cladding, being equal to dividing the traditional single core into two independent sensing zones; in order to realize the WDM technology, we employ a fiber end polishing-connecting method to adjust the resonance angle/wavelength to realize the dynamic range separation. This twin-passage four-channel twin-core fiber SPR sensor is suitable for applying in fields of the multi-channel liquid refractive index and temperature self-reference measurement.
Highlights
Surface plasmon resonance (SPR) is a popular surface analysis method used to detect changes in the refractive index or thickness of an adsorbed layer on or near a SPR-active surface with high sensitivity [1,2,3,4]
According to Jiří Homola [7,8,9], in the prism-based SPR sensors based on spectroscopy analysis, time division multiplexing (TDM) technology and wavelength division multiplexing technology (WDM) are two common methods to realize the multi-channel distributed sensing
In order to solve this problem, by using a twin-core fiber, we propose and demonstrate a novel fiber-based SPR sensor, which employs both the TDM technology and WDM technology simultaneously
Summary
Surface plasmon resonance (SPR) is a popular surface analysis method used to detect changes in the refractive index or thickness of an adsorbed layer on or near a SPR-active surface with high sensitivity [1,2,3,4]. The reason is that it is too hard to divide multi parallel zones in a such small fiber core to obtain multi independent sensing zones to realize the “parallel connection”, as far as we know, there is no report about the single fiber SPR sensor based on the TDM technology. In order to realize the TDM technology, we employ a two-core fiber, which has two cores in a same cladding, being equal to dividing the traditional single core into two independent sensing zones, realizing parallel connection; in order to realize the WDM technology, we employ a fiber grinding and buffer-joint connecting method to adjust the SPR resonance angle and resonance wavelength to realize the dynamic range separation, realizing series connection
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