Optical glucose sensor using a single Faraday rotator

A new approach to non-invasive closed loop optical glucose sensing has been proposed. Incident light on the cornea travels into the eye and reflects from the retina. The reflected light contains information about glucose concentration in the aqueous humor which can potentially be used to measure long term and instantaneous blood glucose concentration. Previous designs have utilized two Faraday rotators to create a closed loop system. The data reported here indicates that only one Faraday rotator is actually needed for this system. The modifications not only cut the system cost substantially, but also improve sensitivity by 143%, over a two Faraday rotator implementation.