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Abstract
In this paper we report the design and experimental realisation of a novel refractive index sensor based on coupling between three nanoscale stripe waveguides. The sensor is highly compact and designed to operate at a single wavelength. We demonstrate that the sensor exhibits linear response with a resolution of 6 × 10−4 RIU (refractive index unit) for a change in relative output intensity of 1%. Authors expect that the outcome of this paper will prove beneficial in highly compact, label-free and highly sensitive refractive index analysis.
Highlights
Plasmons are coherent oscillations of free electrons existing on metal dielectric interfaces and are highly sensitive to the surrounding dielectric environment
We report the realisation of a refractive index sensor based on stripe waveguide coupling
For the Mach–Zehnder interferometer (MZI) based on stripe waveguides, the waveguide is required to support a single long-range surface plasmon polaritons (LRSPPs) mode at 633 nm excitation wavelength
Summary
Plasmons are coherent oscillations of free electrons existing on metal dielectric interfaces and are highly sensitive to the surrounding dielectric environment. Before coupling into the two outer reference and sample arms. We report the realisation of a refractive index sensor based on stripe waveguide coupling (see Figure 1). The presence of the sample changes the wavenumber of the propagating plasmon mode changes the output intensity at the end of the sample arm.
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