طراحی و شبیه‌سازی یک حسگر زیستی مبتنی بر نانو حلقه تشدیدگر دایره‌ای با استفاده از بلورهای فوتونی دوبعدی
محورهای موضوعی : مهندسی برق و کامپیوتر
فریبرز پرندین
1
,
فرصاد حیدری
2
1 - فنی و مهندسی
2 - جهاد دانشگاهی کرمانشاه
کلید واژه: بلورهای فوتونیحسگر زیستیتشدیدگر,
چکیده مقاله :
در این مقاله یک حسگر زیستی بر مبنای بلور فوتونی طراحی شده است. این حسگر دارای دو نانو حلقه دایره‌ای کنار هم است که سبب می‌شود تزویج بین موج‌برها و نانو حلقه تشدیدگر صورت گیرد. برای طراحی حسگر از تعدادی میله دی‌الکتریک استفاده شده که در محیط آب قرار گرفته‌اند. بین موج‌برهای ورودی و خروجی نیز از حلقه‌های تشدیدگر دایره‌ای‌شکل استفاده شده است. همچنین برای بالابردن محدودیت نوری و بهترشدن عملکرد تزویج موج‌برها و نانو حلقه تشدیدگر، مسیرهای ورودی و خروجی به صورت انتها بسته به کار رفته است. در ساختار پیشنهادی که دارای ابعاد کوچکی است، میله سنجش طوری انتخاب شده که ضریب کیفیت بالایی داشته باشد. نتایج شبیه‌سازی نشان می‌دهد که حسگر زیستی طراحی‌شده دارای ضریب کیفیت بالا بوده و با اتصال مولکول زیستی به آن، جابه‌جایی طول موج تشدید به خوبی شکل می‌گیرد. ویژگی مهم دیگر ساختار پیشنهادی این است که تمام میله‌های دی‌الکتریک دارای شعاع یکسان هستند که این موجب آسان‌ترشدن ساخت حسگر می‌شود.
In this paper, a biosensor based on a photonic crystal is designed. This sensor has two adjacent circular nano-rings that allow coupling between the waveguides and the nano-ring resonator. A number of dielectric rods have been used to design the sensor, which are located in the water environment. Circular ring resonators have also been used between the input and output waveguides. Also, in order to increase the optical restriction and improve the coupling performance of waveguides and nano-ring resonator, the input and output paths have been used closed end. In the proposed structure, which has a small dimension, the sensing rod is selected so that is has a high quality factor. The simulation results show that the designed biosensor has a high quality factor and by attaching the biomolecule to it, the displacement of the resonant wavelength is well formed. Another feature of the proposed structure is that all dielectric rods have the same radius, which makes it easier to construct the sensor.
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