Iron Cross Shaped Nanoaperture Based Dual Band Plasmonic Perfect Absorbers for Bio-Sensing Applications

Onur A., Kırlar M., Türkmen M.

10th International Conference on Advanced Technologies, Van, Türkiye, 25 Kasım - 27 Aralık 2022, ss.414-418

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Van
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.414-418
  • Erciyes Üniversitesi Adresli: Evet

Özet

In this study, a novel perfect absorber (PA) array based on iron-cross nanoapertures for bio-sensing applications in mid-infrared regime is presented. Proposed PA array has a dualband spectral response, and the locations of resonances can be adjusted by varying the geometrical dimensions of the structure. Nearly unity absorbance is obtained from the PA array for both resonances. Different dielectric spacers (MgF2, SiO2 and Al2O3) are used to investigate the effects of dielectric spacer on the absorbance characteristics of proposed PA array. Absorbance characteristics of PA array are analyzed by using finite difference time domain (FDTD) method. High field enhancement is achieved by the interaction of the sharp corners of triangular nanoapertures. Linear correlation between the resonance frequencies and the refractive index of cladding mediums is determined. Due to the high refractive index sensitivity and nearfield enhancement, and nearly unity absorbance, the proposed dual-band PA array with adjustable spectral responses can be useful for biosensing applications in mid-infrared regime.