طراحی و مدل سازی حسگر زیستی مبتنی بر نانو تشدیدگر کریستال فوتونی

نوع مقاله: پژوهشی

نویسندگان

دانشگاه شهید رجائی

چکیده

در این مقاله، یک حسگر مبتنی بر نانو تشدیدگر کریستال فوتونی با استفاده از صفحه کریستال فوتونی دو بعدی طراحی و برای کاربرد حسگر زیستی، مدل-سازی شده است. این حسگر شامل دو موجبر و یک نانو تشدیدگر است. به منظور افزایش محدودیت نوری و تزویج نوری بهتر بین موجبرها و تشدیدگر، دو موجبر با انتهایی بسته به عنوان موجبر ورودی و خروجی قرار داده شده است. همچنین اندازه سه حفره‌ی در ساختار تغییر داده شده است. با توجه به اتصال مولکول زیستی به حفره سنجش، ضریب شکست حفره سنجش تغییر کرده و بر اساس آن طول موج تشدید تغییر خواهد کرد. برای مدل کردن اتصال آنالیت در حفره سنجش، ضریب شکست حفره تغییر داده شده است. ضریب کیفیت برای طول موج تشدید اصلی برابر با 2530 به دست آمده است. نتایج نشان می‌دهد که حساسیت برای شناسایی ماده زیستی با ضریب شکست 45/1 (ملکول DNA) برابر با nm/fg 48/9 است.

کلیدواژه‌ها


عنوان مقاله [English]

Design and Modeling of Biosensor Based on Photonic Crystal Nano Resonator

نویسندگان [English]

  • Saeed Olyaee
  • Ahmad Mohebzadeh
چکیده [English]

In this paper, design and optimization of a biosensor based on the nano resonator using two-dimensional photonic crystal (2D-PhC) is presented. The biosensor is consisted of two waveguides and a nano resonator. In order to increase the light confinement and well optical coupling between waveguides and nano resonator, one-end waveguide is selected as the input/output waveguides. Also, the size of three holes of structure has been changed. Due to the biomolecule bio-materials binding to the sensing hole, the refractive index of the hole is changed and consequently the resonant wavelength is shifted. The results show that the quality factor is about 2530. The sensitivity of biosensor for bio-materials sensing with effective refractive index about 1.45 (DNA molecule) is also obtained 9.48 nm/fg.

کلیدواژه‌ها [English]

  • Biosensor
  • photonic crystal
  • nano resonator
  • sensing hole
  • Sensitivity
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