Improving field localization and figure-of-merit value in plasmonic structures via path-interference effect

ŞAHİN R.

SUPERLATTICES AND MICROSTRUCTURES, cilt.133, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 133
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.spmi.2019.106218
  • Dergi Adı: SUPERLATTICES AND MICROSTRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Bow-tie, Plasmonic, Path interference, Ultra-sensitive, Ultra-intense, SENSORS
  • Akdeniz Üniversitesi Adresli: Evet

Özet

We present here an ultra-intense field localization at both on-resonant and off-resonant wave-lengths via path interference effect in nanoscale Au Bow-tie structure with single molecule coupling. First, the physics behind the Au Bow-tie with single molecule interaction is explained. Then, path-interference effect is obtained through analysis and some simulations performed with 3D Maxwell Solver (MNPBEM) in MATLAB. The coupling yields ultra-narrow resonances due to path-interference, which are very sensitive to changes into refractive index of surrounding medium. The figure-of-merit for the proposed structures is also calculated and it is demonstrated that much higher values can be obtained compared to conventional plasmonic sensors.