Optical Fiber Probe with Integrated Micro-Optical Filter for Raman and Surface-Enhanced Raman Scattering Sensing

Citation

Al Mamun, M.A.; Katkus, T.; Mahadevan-Jansen, A.; Juodkazis, S.; & Stoddart, P.R. (2024). Optical Fiber Probe with Integrated Micro-Optical Filter for Raman and Surface-Enhanced Raman Scattering Sensing. Nanomaterials, 14(16), 1345.

Keywords

• Raman scattering
• Surface-enhanced Raman scattering (SERS)
• Optical fiber probe
• Double-clad fiber (DCF)
• Optical nanosensing
• Microfilter
• Femtosecond laser micromachining
• In vivo biosensing
• In situ monitoring
• Hostile environments
• Silica Raman scattering background
• Miniaturization
• Plasmonic film
• Thiophenol
• Analyte
• Numerical aperture (NA)

Brief

This article presents a novel miniaturized optical fiber probe for Raman and Surface-Enhanced Raman Scattering (SERS) sensing featuring a micro-optical filter directly integrated onto the tip of a double-clad fiber (DCF) using femtosecond laser micromachining, demonstrating an improved signal-to-background ratio for thiophenol detection compared to unfiltered DCF probes.

Summary

Researchers developed a tiny optical fiber probe for Raman and SERS sensing by integrating a micro-optical filter onto the tip of a double-clad fiber (DCF) using femtosecond laser micromachining. This novel double-sided filter, consisting of a short-pass and a long-pass filter, helps to reduce the background noise from the silica fiber. The probe, further modified with a SERS-active film, showed improved signal detection for thiophenol, demonstrating its potential for highly sensitive and minimally invasive sensing applications.

Origin: https://doi.org/10.3390/nano14161345