Hollow core Bragg fibers for miniaturization of fluorescence sensors

Abstract

Hollow core Bragg fibers (HC-BFs) with a conventional multilayered cladding or with a defect layer are employed to realize a miniaturized and highly sensitive fluorescence sensor. The performance of our proposed fluorescence sensor strongly depends on the large core HC-BF that simultaneously acts as a sample cell, a fluorescence collector and a filter for the noisy excitation light. Notably, both the photonic bandgap effect and the transverse resonant behavior can be used for filtering the noisy excitation light mixed in the fluorescence. Finally, two presented examples verify the validity and feasibility of the design principle.