High Q-factor Dual Resonance Visible Plasmonic Array

Demirtaş H., Türkmen M., Aslan E., Aslan E.

4th International Congress of Engineering and Natural Sciences Studies, Ankara, Turkey, 24 - 25 May 2024, pp.160

  • Publication Type: Conference Paper / Summary Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.160
  • Kayseri University Affiliated: Yes


A high Q-factor design for a double resonant aperture-based plasmonic nanoantenna is presented. The thickness of the gold layers used as conductive layers in nanoantenna designs is inversely proportional to its spectral response in the range between 400 nm and 700 nm. As the thickness of the gold layers increases, the spectral response of the antenna in the visible region reduces the resonant peak amplitude. To overcome this issue, the thickness of the gold layers is decreased to as low as 5 nm. In this aperturebased nanoantenna design, magnesium fluoride is used as the separator layer with a thickness of 100 nm. The effects of dimensional changes in each parameter forming the nanoantenna geometry on the transmittance and reflectance peaks are observed. The behavior of the four-arrow shaped plasmonic nanoantenna is thoroughly analyzed using the Finite Difference Time Domain method to understand its optical properties and performance. A strong dual transmittance response is obtained at two wavelengths: 444 nm and 643 nm, corresponding closely to violet and red, respectively. Electric field intensity data from this design, simulated by near-field analysis, indicates the strongest points at which biological molecules can be detected. According to the simulation results, this nanoantenna's response may provide advantages for noninvasive detection applications.

Keywords: Q-factor Resonances, Dual-Band Nanoantenna, Plasmonic Detection.