Giant refractometric sensitivity by combining extreme optical Vernier effect and modal interference

Author:

Gomes André D.,Kobelke Jens,Bierlich Jörg,Dellith Jan,Rothhardt Manfred,Bartelt Hartmut,Frazão Orlando

Abstract

Abstract The optical Vernier effect consists of overlapping responses of a sensing and a reference interferometer with slightly shifted interferometric frequencies. The beating modulation thus generated presents high magnified sensitivity and resolution compared to the sensing interferometer, if the two interferometers are slightly out of tune with each other. However, the outcome of such a condition is a large beating modulation, immeasurable by conventional detection systems due to practical limitations of the usable spectral range. We propose a method to surpass this limitation by using a few-mode sensing interferometer instead of a single-mode one. The overlap response of the different modes produces a measurable envelope, whilst preserving an extremely high magnification factor, an order of magnification higher than current state-of-the-art performances. Furthermore, we demonstrate the application of that method in the development of a giant sensitivity fibre refractometer with a sensitivity of around 500 µm/RIU (refractive index unit) and with a magnification factor over 850.

Funder

Fundação para a Ciência e a Tecnologia

European Regional Development Fund

Projekt DEAL

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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