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

Yıl 2024, Cilt: 40 Sayı: 2, 361 - 371, 31.08.2024

Ahmet Murat Erturan , Seyfettin Sinan Gültekin

Öz

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.

Anahtar Kelimeler

Plasmonic biosensor, perfect absorber, refractive index sensor, cancer detection

Üç-bantlı Mükemmele Yakın Emici ile Kırılma İndisi Değişimi Tespiti

Öz

Öz: Bu çalışmada orta kızılötesi bölgede çalışan, üçlü bantlarda mükemmele yakın soğurma sağlayan bir anten önerilmektedir. Nano halka ve nano çapraz antenlere sahip neredeyse mükemmel plazmonik soğurucu, sayısal simülasyonlarda yüksek soğurma verimliliği gösterdi. Üç bantlı soğurucu, 2730 nm, 4609 nm ve 7510 nm dalga boylarında sırasıyla %95,2, %97,3 ve %98,1 emme oranları sergiledi. Yüksek soğurma değerleri, antenin dielektrik ve metal katmanları arasındaki lokalize plazmonun oldukça güçlü olduğunu açıklamaktadır. Dalga boyunun altındaki parçacıklar tarafından üretilen bu yüksek enerjili rezonans modları, sensör yüzeyinin değişen çevre koşullarına güçlü bir şekilde yanıt vermesini sağlar. Güçlü yanıt, sensörün patojenleri, biyomolekülleri, kimyasalları ve organizmaları tespit etme yeteneğini vurgular. Her rezonans modunun değişken yanıtı, biyomoleküllerin tanımlanmasını destekler. Önerilen üç bantlı mükemmel soğurucunun sırasıyla 112,23 nm/RIU, 497,17 nm/RIU ve 841,94 nm/RIU hassasiyet değerlerine sahip olduğu gösterilmiştir. Her rezonans modunun değişen kırılma indislerine göre değer değerleri sırasıyla 3,67 RIU-1, 1,369 RIU-1 ve 1,271 RIU-1 olarak hesaplandı. Sayısal sonuçlar, sensörün kırılma indisi değişikliklerini hassas bir şekilde tespit edebildiğini göstermektedir. Algılama yeteneğini göstermek için farklı kanser hücrelerinde rezonans modlarındaki değişiklikler incelendi. Önerilen mükemmele yakın soğurucu, farklı kanser hücrelerini 3,67 RIU-1, 1,369 RIU-1 ve 1,271 RIU-1 gibi yüksek tespit seviyesinde tespit edebilmektedir.

Anahtar Kelimeler

Plazmonik biyosensör, mükemmel soğurucu, kırılma indisi sensörü, kanser tespiti

Kaynakça

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