Abstract
Abstract In this article, we present a multiperiodic nanohole array structure for improved sensing. The structure consists a series of rows of nanoholes, each having a different period in an ascending order. A monochromatic source illuminates the structure, and a resonance condition is met for the row having a momentum matching Bloch wave, which leads to extraordinary optical transmission. With this new plasmonic structure, the sensing signal can be retrieved using the spatial position of the transmission maxima. This setup requires a simple optical setup while achieving increased resolution and accuracy. A resolution of 4.6×10−6 refractive index units is achieved, which is comparable to surface plasmon resonance system based on the Kretchmann configuration.
Highlights
Ever since nanohole arrays were shown to exhibit extra ordinary optical transmission [1] and were used for sensing [2], there has been a considerable amount of research done to demonstrate their potential as biomedical diagnostic tools
In this article, we present a multiperiodic nano hole array structure for improved sensing
Early demonstrations of sensing using those devices showed several challenges [4], in terms of resolution, which ranged between 1 × 10−4 and 1 × 10−5 refractive index units (RIU) [5,6,7,8,9], compared to analogous devices based on surface plasmon resonance (SPR), which typically range at 1 × 10−6–1 × 10−7 RIUs
Summary
Ever since nanohole arrays were shown to exhibit extra ordinary optical transmission [1] and were used for sensing [2], there has been a considerable amount of research done to demonstrate their potential as biomedical diagnostic tools This type of sensor is well suited for highly multiplexed sensing, as the arrays can be inte grated in an imaging system, taking advantage of linear col limation. Angular scans are never used, and the systems rely on an intensity or wavelength interrogation
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