Refractive Index Sensor and Cancer Cell Detection with Plasmonic-Based Three-Band Nearly Perfect Absorber

Authors : Ahmet Murat Erturan, Seyfettin Sinan Gültekin

Pages : 361-371

View : 47 | Download : 42

Publication Date : 2024-08-31

Article Type : Research Paper

Abstract :In this study, an antenna providing nearly perfect absorption in triple-bands operating in the mid-infrared region is proposed. The nearly perfect plasmonic absorber, featuring nanoring and nanocross antennas, demonstrated high absorption efficiencies in numerical simulations. The triple-band absorber exhibited absorption rates of 95.2%, 97.3%, and 98.1% at wavelengths of 2730 nm, 4609 nm, and 7510 nm, respectively. High absorption values explain that the localized plasmon between the dielectric and metal layers of the antenna is quite strong. These high-energy resonance modes generated by subwavelength particles enable the sensor surface to respond robustly to varying environmental conditions. The strong response highlights the capability of the sensor to detect pathogens, biomolecules, chemicals, and organisms. The variable response of each resonance mode supports the identification of biomolecules. The proposed three-band perfect absorber is shown to have sensitivity values of 112.23 nm/RIU, 497.17 nm/RIU, and 841.94 nm/RIU, respectively. According to the changing refractive indices of each resonance mode, the figure of merit values was calculated as 3.67 RIU-1, 1.369 RIU-1, and 1.271 RIU-1, respectively. The numerical results show that the sensor can detect refractive index changes sensitively. To demonstrate the sensing ability, changes in resonance modes with different cancer cells were examined. The proposed nearly perfect absorber can detect different cancer cells at high detection level as 3.67 RIU-1, 1.369 RIU-1, and 1.271 RIU-1.
Keywords : Plazmonik biyosensör, mükemmel soğurucu, kırılma indisi sensörü, kanser tespiti