Photonic Crystal Slab Biosensors and its Applications

Öz

In this study, filling factor, sensitivity, quality factor, and local density of states variation depending on resonance frequency changing refractive index of liquid medium and radius of spherical silver metal nanoparticle inside unit cell for titanium dioxide (TiO2) photonic crystal slab biosensor device is investigated. This structure is typically used for protein-protein interaction, display of primitive cells, cancer cell metastasis, enzyme detection, Deoxyribonucleic acid (DNA) microarrays. Proposed calculations include a square lattice of air holes created in two-dimensional TiO2 photonic crystal structure and a small spherical sphere nanoparticle into the air holes is put in order to see shift in resonant wavelength’s. Lattice constant (a= 1 μm) was used in the calculations. Analyses have been performed in the wavelength range of 1500-1550 nm. The calculations were made by software MIT Electromagnetic Equation Propagation based finite-difference time-domain method.

Anahtar Kelimeler

• Photonic crystal,Optical biosensor,Quality factor,Sensitivity,Resonant wavelength

Fotonik Kristal Levhalı Biyosensörler ve Uygulamaları

Öz

Bu çalışmada, fotonik kristalden tasarlanan biyosensör cihazı için rezonans frekansını değiştiren sıvı ortamın kırılma indisine ve titanyum dioksit (TiO2) birim hücre içindeki küresel gümüş metal nanopartikülünün yarıçapına bağlı olarak değişen dolgu faktörü, duyarlılık, kalite faktörü ve lokal yoğunluk incelendi. Bu yapı tipik olarak protein-protein etkileşimi, ilkel hücrelerin görüntülenmesi, kanser hücresi metastazının var olup olmadığının, enzim ve Deoksiribonükleik asit (DNA) mikrodizilerin belirlenmesi için kullanılır. Önerilen hesaplamalar, rezonant dalga boyundaki kaymayı görmek için iki boyutlu TiO2 fotonik kristal yapısında yaratılan boşluklarının kare örgüsünü ve hava boşluklarına yerleştirilen küçük bir küresel nanopartikülünü kapsamaktadır. Hesaplamalarda örgü sabiti olarak (a= 1 μm) kullanıldı. Analizler 1500-1550 nm dalga boyu aralığında yapıldı. Hesaplamalar, MIT Elektromanyetik Denklem Yayılımına dayalı zamanda sonlu farklar yöntemi yazılımı ile yapılmıştır.

Anahtar Kelimeler

• Fotonik kristal,Optik biyosensör,Kalite faktörü,Duyarlılık,Rezonans dalgaboyu

Kaynakça

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