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https://doi.org/10.1016/j.optcom.2020.126178
Copy DOIJournal: Optics Communications | Publication Date: Jun 9, 2020 |
Citations: 62 |
Plasmonically-induced transparency (PIT)-like effect has developed into a powerful approach for accurate monitoring of biomaterial. For this purpose, several invaluable sensors are introduced. However, tunable biosensors are very challenging. Therefore, we propose the combination of PIT-like effects with biomaterials as a biosensing system and use the finite difference time domain method as well as the three-level plasmonic system model. The shifting in responses upon changing of geometrical parameters at the surface of a plasmonic layer are used as a main mechanism in the proposed structure. To get optimal results including the highest sensitivity, environmental and geometrical properties including temperature, pressure, disk inner and outer length, and gaps are considered. Specifically, we evaluated two types of stimulation: response to ethanol, and water. Sharp PIT-like resonances in the optimized disk arrays provide high-intensity sensitivities, with an element size of 500 × 330 nm2. Refractive index, temperature, and pressure sensitivities of 1271 nm per refractive index unit (nm/RIU), 0.47 nm per Celsius degree (nm/∘C) for ethanol and 0.077 nm/∘C for water, and 5 nm per Mega Pascal (nm/MPa) are obtained. The proposed structure is very useful for detecting ultra-low concentrations of analytes.
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