بررسی اثرات افزایش طول مسیر نوری با موجبرهای خمیده بر روی پاسخ نوری تشدیدکننده میکرو دیسکی مبتنی بر موج‌های نجوایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی برق و کامپیوتر، دانشگاه تبریز، تبریز، ایران

2 دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

امروزه حسگرهای زیستی مبتنی بر موج‌های نجوایی به سبب تئوری ساده و پاسخ نوری مناسب جهت شناسایی تک مولکولی و تک ویروسی، جایگاه ویژه‌ای در حوزه حسگرهای نوری دارند. در این بین، تشدیدکننده‌های میکرودیسکی به سبب هزینه ساخت پایین و همچنین انتخابگری و دقت بالا مورد توجه قرار گرفته‌اند. در این مقاله، به بررسی اثرات شکل و انحنای موجبر بر روی پاسخ نوری حسگر میکرو دیسکی مبتنی بر موج‌های نجوایی پرداخته شده است. اثرات فاصله‌ی موجبر و تشدید کننده بر روی معیارهای حسگر بررسی شده است، که در نهایت مناسب‌ترین فاصله جهت عملکرد بهینه حسگر انتخاب شده است. با بهبود ساختار، حساسیت برای حسگری با انحنای 180 درجه به 50nm/RIU و 52nm/RIU  و برای حسگری با انحنای 90 درجه به 47nm/RIU  و 48nm/RIU  ، به ترتیب برای مدهای اول و دوم هر ساختار، افزایش یافته است. نتایج شبیه سازی نشان می‌دهد انحنای بیشتر باعث افزایش و حفظ طول مسیر نور با تشدید کننده شده و در نتیجه عملکرد حسگر بهبود می‌یابد.  این حسگر را در حوزه پزشکی، محیط‌زیست جهت شناسایی ذرات ریزمولکولی می‌توان به کار برد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the Effects of Increasing the Optical Path Length on the Optical Response of a Whispering Gallery Mode-Based Micro-Disk Resonator by Using Curved Waveguides

نویسندگان [English]

  • Fatemeh Aghaei 1
  • Saeed Golmohammadi 1
  • Hamid Bahador 2
  • Hadi Soofi 1
1 Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
2 Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Nowadays, biosensors based on whispering gallery mode play a special role in optical sensors due to their simple theory and suitable optical response for single-molecule and single-virus detection. In the meantime, micro-disk resonators have received attention because of their low fabrication cost, high selectivity, and accuracy. In this work, we study the effects of the waveguide's shape and curvature on the micro-disk sensor's optical response based on whispering waves. The distance between waveguide and resonator effects on the sensor parameters has been investigated. Finally, the most suitable distance has been selected for the sensor's optimal performance. By improving the structure, the sensitivity for the first and second modes with a 180° curve to 50 nm/RIU and 52 nm/RIU and a 90° curve to 47nm/RIU and 48nm/RIU, respectively. The simulation results show that the greater the curvature of the waveguide, the longer the optical path length. Also, the sensor's performance is improved. This sensor can be used to detect single molecular particles in the medical and environmental fields.

کلیدواژه‌ها [English]

  • Whispering-Gallery-Mode
  • Resonator
  • Curved waveguide
  • Micro-disk
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