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Vapor Sensing with Polymer Coated Straight Optical Fiber Microtapers Based on Index Sensitive Interference Spectroscopy of Surface Stress Birefringence
摘要： Optical micro?ber tapers provide an advantageous platform for sensing in aqueous and gas environments. We study experimentally the photonic transmission in optical ?ber tapers coated with polymethyl methacrylate (PMMA), a polymeric material widely used in optical applications. We demonstrate a durable and simple humidity sensing approach incorporating tapered micro?bers attached to silicon (Si) substrate coated with active polymer layer. A model is described for the load stress effect on the birefringence giving rise to interferences in the transmission spectra, strongly dependent on the coating layer thickness, and disappearing following its slow uniform removal. The sensing approach is based on characterization of the interference patterns observed in the transmission spectra of the taper in the NIR range. The device demonstrated persistent detection capability in humid environment and a linear response followed by saturation to calibration analytes. In each analyte of interest, we de?ne principal components and observe unique calibration plot regimes in the principal component space, demonstrating vapor sensing using polymer coated microtapers.
关键词： microstructured ?bers,optical resonators,optical sensing
更新于2025-09-23 15:21:01
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Borosilicate Based Hollow-Core Optical Fibers
摘要： We discuss the fabrication of hollow-core optical ?bers made of borosilicate glass. We show that, despite the high attenuation of the glass relative to silica, the ?ber optical losses can be of the same order of magnitude of those obtained by using ultrapure silica glass. Short lengths of the fabricated ?bers, used in combination with incoherent optical sources, provide single-mode optical guidance in both near and mid-infrared spectral ranges without any additional optical components.
关键词： ?ber design and fabrication,?ber properties,microstructured ?bers
更新于2025-09-11 14:15:04