Gold-coated silver nanorods on side-polished singlemode optical fibers for remote sensing at optical telecommunication wavelengths
Year: 2024
Type: article
Abstract: The lower refractive index sensitivity (RIS) of plasmonic nanoparticles (NP) in comparison to their plasmonic thin films counterparts hindered their wide adoption for wavelength-based sensor designs, wasting the NP characteristic field locality. In this context, high aspect-ratio colloidal core-shell Ag@Au nanorods (NRs) are demonstrated to operate effectively at telecommunication wavelengths, showing RIS of 1720 nm/RIU at 1350 nm (O-band) and 2325 nm/RIU at 1550 nm (L-band), representing a five-fold improvement compared to similar Au NRs operating at equivalent wavelengths. Also, these NRs combine the superior optical performance of Ag with the Au chemical stability and biocompatibility. Next, using a side-polished optical fiber, we detected glyphosate, achieving a detection limit improvement from 724 to 85 mg/L by shifting from the O to the C/L optical bands. This work combines the significant scalability and cost-effective advantages of colloidal NPs with enhanced RIS, showing a promising approach suitable for both point-of-care and long-range sensing applications at superior performance than comparable thin film-based sensors in either environmental monitoring and other fields. • High aspect-ratio colloidal core-shell Ag@Au nanorods operating at telecommunication wavelengths. • Enhanced Refractive Index Sensitivity (RIS) with Ag@Au nanorods achieving 1720 nm/RIU at 1350 nm and 2325 nm/RIU at 1550 nm. • Combines Au's chemical stability with Ag's superior RIS for robust, high-performance plasmonic nanorods. • Ag@Au NRs in real-time sensing lowered glyphosate detection limit from 724 to 85 mg/L by shifting to C/L bands. • Integration with side-polished SMF28 offering cost-effective, specific, and highly efficient long-range LSPR-based sensing.
Source: Sensors and Actuators B Chemical
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4404850985