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Updated: Jan 27, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Implementation and phase detection of dielectric-grating-coupled surface plasmon resonance sensor for backside
Abstract:
This paper proposes a design for a dielectric-grating-coupled surface plasmon resonance (SPR) sensor that can be fabricated using a low-cost nanoimprint process and exhibits a high phase detection sensitivity when light is incident on the backside of the sensor and does not pass through the analyte on the front-side of the sensor. A low-refractive-index material (mesoporous silica) is utilized to implement a reverse symmetric waveguide structure that can enhance electric-field strength on the sensor surface and improve detection sensitivity. A sol-gel method is used to fill the groove of the grating structure with a high-refractive-index material (titanium dioxide), and surface smoothness is improved via a flat silicon impression mold. The experimental results indicate that although the sensor device exhibits defects and non-smooth surface relief, phase detection sensitivity can still be achieved as high as 2 × 10-5 RIU by using an electro-optic heterodyne interferometer.
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