Refractive index sensing with an air-slot photonic crystal nanocavity

We investigate an air-slot photonic crystal cavity for high-precision refractive index sensing. The high quality factor ∼2:6 × 10^4 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 510 nm per refractive index unit (RUI) and a detection limit below 1 × 10^−5 RUI. The device has a remarkably low sensing volume of 40 aliters, holding less than 1 × 10^6 molecules.


Published in:
Optics Letters, 35, 15, 2523-2525
Year:
2010
Publisher:
Optical Society of America
ISSN:
0146-9592
Keywords:
Laboratories:




 Record created 2010-07-29, last modified 2018-01-28

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