Ms. Ekin Aslan Profile

Ekin Aslan

at Erciyes Univ

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Proceedings Article | 6 March 2014 Paper

Optical characterization of Jerusalem cross-shaped nanoaperture antenna arrays

Mustafa Turkmen, Ekin Aslan, Erdem Aslan

Proceedings Volume 8976, 89761E (2014) https://doi.org/10.1117/12.2039587

KEYWORDS: Gold, Antennas, Metals, Silicon, Glasses, Transmittance, Terahertz radiation, Nanostructures, Reflectivity, Nanoantennas

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Recent advances in nanofabrication and computational electromagnetic design techniques have enabled the realization of metallic nanostructures in different shapes and sizes with adjustable resonance frequencies. To date, many metamaterial designs in various geometries with the used of different materials have been presented for the applications of surface plasmons, cloaking, biosensing, and frequency selective surfaces^1-5. Surface plasmons which are collective electron oscillations on metal surfaces ensure that plasmonic nanoantennas can be used in many applications like biosensing at infrared (IR) and visible regions. The nanostructure that we introduce has a unit cell that consists of Jerusalem crossshaped nanoaperture on a gold layer, which is standing on suspended SiN_x, Si or glass membranes. The proposed nanoaperture antenna array has a regular and stable spectral response. In this study, we present sensitivity of the resonance characteristics of Jerusalem cross-shaped nanoaperture antenna arrays to the changes in substrate parameters and metal thickness. We demonstrate that resonance frequency values can be adjusted by changing the thicknesses and types of the dielectric substrate and the metallic layer. Numerical calculations on spectral response of the nanoantenna array are performed by using Finite Difference Time Domain (FDTD) method⁶. The results of the simulations specify that resonance frequencies, the reflectance and transmittance values at resonances, and the band gap vary by the change of substrate parameters and metal thicknesses. These variations is a sign of that the proposed nanoantenna can be employed for sensing applications.

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