طراحی گیت منطقی AND تمام نوری مبتنی بر بلور فوتونی با ابعاد بسیار کم و مناسب برای مدارهای مجتمع نوری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی دانشگاه شهید رجایی، آزمایشگاه تحقیقاتی نانوفوتونیک و اپتوالکترونیک

2 دانشگاه تربیت دبیر شهید رجائی

چکیده

در این مقاله با استفاده از شبکه بلور فوتونی دو بعدی یک ساختار فشرده و ساده به‌منظور ایجاد گیت منطقی تمام نوری AND معرفی شده است. ساختار طراحی شده متشکل از سه موجبر بلور فوتونی است که توسط یک نانو تشدیدگر به هم متصل شده‌اند. نانو تشدیدگر با افزایش شعاع میله‌ دی‌الکتریک شکل گرفته است. تحلیل و بررسی‌ها با استفاده از روش تفاضل متناهی در حوزه زمان و بسط امواج تخت صورت گرفته است که روش بسط امواج تخت برای به‌دست آوردن شکاف باند فوتونی و روش تفاضل متناهی در حوزه زمان برای بررسی رفتار میدان الکترومغناطیس در ساختار بلور فوتونی استفاده شده است. مزایای این طراحی ابعاد کوچک، بالا بودن امکان تحقق، هماهنگی با فن‌آوری سیلیکون و بالا بودن توان خروجی در حالت یک منطقی است. زمان تاخیر این گیت برابر با ps 32/0 است. نسبت کمینه توان نوری دریافت شده به توان ورودی در حالت یک منطقی برابر با 968/1 و نسبت بیشینه توان نوری به توان ورودی در حالت صفر منطقی 492/0 است. در نتیجه میزان نسبت کنتراست برای گیت طراحی شده برابر با dB 6 است. بالا بودن توان نور در خروجی، گیت منطقی طراحی شده را قادر می‌سازد گیت‌های منطقی طبقه بعدی را فعال سازد و در مدارات مجتمع قرار گیرد. با توجه به ویژگی‌های مطرح شده این گیت منطقی می‌تواند در مدارات مجتمع تمام نوری استفاده شود.

کلیدواژه‌ها


عنوان مقاله [English]

Design of an All-Optical AND Logic Gate based on Photonic Crystal with Small Dimensions Suitable for Integrated Optical Circuits

نویسندگان [English]

  • Saeed Olyaee 1
  • Ahmad Mohebzadeh Bahabady 2
1 Shahid Rajaee Teacher Training University
2 Shahid Rajaee Teacher Training University
چکیده [English]

In this paper, using a two-dimensional photonic crystal, a compact and simple structure is introduced for an all-optical AND logic gate. The designed structure consists of three photonic crystal waveguides connected by a nano resonator. The nano resonator is formed by increasing the radius of the dielectric rod. Analysis and investigations have been done using the finite-difference time-domain and plane wave expansion methods. The plane wave expansion method is used to obtain photonic band gap and finite-difference time-domain method is used to study the electromagnetic field behavior in photonic crystal structure. The advantages of this design are small dimension, the high possibility of realization, and high output power in logical state of 1. The delay time of this gate is 0.32 ps. The minimum ratio of the received optical power to the input power in logical state 1, is 1.968 and the maximum ratio of the optical power to the input power in logic zero mode is 0.492. So, the contrast ratio for the designed logic gate is 6 dB. The high output power allow the logic gate to enable to be integrated the next level logic gates into the optical integrated circuits. Considering the features mentioned, this logic gate can be used in optical integrated circuits.

کلیدواژه‌ها [English]

  • All-optical logic gate
  • nano resonator
  • optical integrated circuits
  • interference effect
  • contrast ratio
  • response time
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