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High-sensitivity polymer-based bimodal plasmonic refractive index sensors with polymer cladding
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Abstract
En 中文
Plasmonic refractive index sensors are essential for detecting subtle variations in the ambient environment through surface plasmon interactions. Current efforts utilizing CMOScompatible, plasmo-photonic Mach-Zehnder interferometers with active power balancing exhibit high sensitivities at the cost of fabrication and measurement complexity. Alternatively, passive bimodal plasmonic interferometers based on SU-8 waveguides offer cost-effectiveness and a smaller device footprint. However, their waveguides are exposed to ambient conditions and currently lack the necessary opto-mechanical isolation. In this work, we introduce the new SX AR LWL 2.0 polymer cladding material, which provides a high refractive index contrast to the SU-8 core, while ensuring compatibility with SU-8 waveguides. Our sensors consist of an aluminum plasmonic stripe and a bilayer SU-8 photonic waveguide core which is cladded with the SX AR LWL 2.0 polymer. They achieve a sensitivity of (6108 +/- 13) nm/RIU (refractive index unit), where the error indicates the data fitting tolerance, and a limit of detection of 1.6 x 10(-7)RIU, in aqueous solutions, surpassing both traditional and polymer-based bimodal plasmo-photonic sensors. This new cladding material paves the way for more efficient and integrated bimodal plasmonic refractive index sensing platforms for a wide range of applications.
Keywords:
BIOSENSORS
Journal
IF:
3.3
Papers:
6.1W
Citations:
14.3W
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