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Refractive index sensing with an air-slot photonic crystal nanocavity

2010; Optica Publishing Group; Volume: 35; Issue: 15 Linguagem: Inglês

10.1364/ol.35.002523

ISSN

1539-4794

Autores

Jana Jágerská, Hua Zhang, Zhaolu Diao, Nicolas Le Thomas, R. Houdré,

Tópico(s)

Optical Coatings and Gratings

Resumo

We investigate an air-slot photonic crystal cavity for high-precision refractive index sensing. The high quality factor approximately 2.6x10(4) of the cavity, along with a strong overlap between the resonant mode and the hollow core region, allows us to achieve an experimental sensitivity of 510nm per refractive index unit (RUI) and a detection limit below 1x10(-5)RUI. The device has a remarkably low sensing volume of 40aliters, holding less than 1x10(6)molecules.

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