Exploiting Extraordinary Optical Transmission in Plasmonic Slit Nanoantennas for Sensor Applications

In this article, a plasmonic gold nanoantenna is proposed as a sensor to monitor refractive index variations between 1.30 and 1.35. These values are defined since they are characteristic of, for instance, water-based solutions, DNA, or haemoglobin. To simulate the device a novel model is used, which...

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Bibliographic Details
Published in:IEEE photonics journal 2024-04, Vol.16 (2), p.1-8
Main Authors: Lameirinhas, Ricardo A. Marques, Bernardo, Catarina P. Correia V., Torres, Joao Paulo N., Baptista, Antonio, Martins, Maria Joao M.
Format: Article
Language:English
Subjects:
Emission
Excitation
Extraordinary optical transmission
Nanoantennas
nanostructures
optical devices
Optical reflection
Optical refraction
Optical sensors
Optical variables control
optics
Photonics
Plasmonics
Refractive index
Refractivity
Sensitivity analysis
Sensors
Steady state models
subwavelength structures
surface plasmon polaritons
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Summary:In this article, a plasmonic gold nanoantenna is proposed as a sensor to monitor refractive index variations between 1.30 and 1.35. These values are defined since they are characteristic of, for instance, water-based solutions, DNA, or haemoglobin. To simulate the device a novel model is used, which takes advantage of the wave- particle dualism and the generalised Fresnel coefficients for absorbing media. Although it is a time-domain model, in this research work the model is improved to compute steady state and frequency-domain results. The response to a Dirac excitation is obtained using that novel model. The steady state is reached for a long pulse emission. The long pulse emission is emulated by a Dirac comb and consequently, the optical response of the device for this kind of excitation is obtained considering the sum of several Dirac's responses shifted in time. Then, steady state might be reached as suggested by the presented results. Taking into account the obtained pulse responses, the refractive index sensor for the range 1.30-1.35 is proposed. The obtained results suggest that 350 nm and 450 nm are the best wavelengths to detect these analyte variations. The sensitivity reaches values up to around 110%/RIU, but sensitivities around 80%/RIU are computed within the range 250-500 nm.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2024.3376641