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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Gomes, AD (Autor) Outra; Kobelke, J (Autor) Outra; Bierlich, J (Autor) Outra; Dellith, J (Autor) Outra; Rothhardt, M (Autor) Outra; Bartelt, H (Autor) Outra; Frazao, O (Autor) FCUP

Revista

Título: Scientific Reports

Vol. 10

ISSN: 2045-2322

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00T-0BJ

DOI: 10.1038/s41598-020-76324-7

Abstract (EN): 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 mu m/RIU (refractive index unit) and with a magnification factor over 850.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14