Spectroscopic analysis with a monolithic micro-structured microsphere ber probe

摘要

A microsphere-fiber probe used for spectroscopic analysis of material samples is presented. The monolithicstructure is formed by melting the end of a section of optical fiber forming a bead at the distal end of the ber.Light guided through the ber and emerges from the sphere focusing to a point beyond the surface. Ramanscattering is used to demonstrate the e cacy of the probe, which operates in a bidirectional manner effcientlycollecting the scattered light, re-imaging it back into the waveguide, and transmitting it to a spectrometer fordispersion. The probe demonstrates an order of magnitude improvement over the spatial resolution conventionalfiber probes. This improvement in spatial resolution and corresponding collection e ciency will aid in criticalanalyses such as cancer margin detection and material characterization.