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25 September 2014 Plasmonic properties of suspended nanodisc structures for enhancement of the electric field distributions
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Proceedings Volume 9288, Photonics North 2014; 92880Z (2014)
Event: Photonics North 2014, 2014, Montréal, Canada
Metallic nanostructures possess many advantages for utilization in various applications including sensing applications. However, achieving an easy to fabricate platform with high sensitivity performance is considered the main challenge in designing such nanostructures. Two factors should be considered when designing a wavelength based nanostructured sensor; the field distribution around the nanostructures, and the full width at half maximum (FWHM) of the sensor spectral response. In this paper, we study suspended nanodisc structures as a candidate for enhancing the electric field distribution in-plane and out of plane axes of the nanodiscs, and hence enhancing the probe depth of the nanosensor. Another advantage of the suspended nanodisc structure is that it offers a 100% surface coverage. The Finite Difference Time Domain (FDTD) method is used for the study of optical properties of the structure. The resonance location depends on the dimensions of the nanodiscs as well as the polymer base. Higher order modes can also be supported by nanodiscs with larger dimensions. The local electric field is enhanced as it is distributed in both perpendicular and horizontal planes with respect to the plane of gold nanodiscs without altering the FWHM relative to the regular nanodisc structure. This is considered as an advantage in sensing applications. Another advantage of this structure is that it can be readily fabricated by nanoimprint lithography and gold deposition.
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A. Abumazwed and A. G. Kirk "Plasmonic properties of suspended nanodisc structures for enhancement of the electric field distributions", Proc. SPIE 9288, Photonics North 2014, 92880Z (25 September 2014);

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