AI Article Synopsis
- A new type of sensitive sensor is created by immobilizing gold nanospheres on a microstructured fiber, designed to detect changes in the refractive index of liquids.
- These fibers have a small core diameter and utilize electrostatic control to arrange the nanoparticles at a density of 4 nanoparticles per micrometer, achieving high sensitivity (200 nm/RIU) for aqueous solutions.
- This innovative sensing platform is user-friendly, efficient, and can be integrated into various systems for quick detection of small sample volumes.
Article Abstract
Here, we show that immobilizing ensembles of gold nanospheres within tailored areas on the open side of an exposed-core microstructured fiber yields a monolithic, highly sensitive plasmon-based refractive index sensor. The nanoparticle densities (average nanoparticle diameter: 45 nm) on the small-core fiber (core diameter: 2.5 μm) are controlled electrostatically, yielding densities of 4 nanoparticles/μm. Refractive index sensitivities of 200 nm/RIU for aqueous analytes at high fringe contrast levels (-20 dB) have been observed. Our concept presents an easy-to-use, efficient, and multiplex-compatible sensing platform for rapid small-volume detection with the capacity for integration into a bioanalytic, optofluidic, or microfluidic system.
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| http://dx.doi.org/10.1364/OL.42.004395 | DOI Listing |
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