طراحی عناصر نوری پراشی دریچه- محدود دوبعدی با تعمیم روش طیف زاویه‌ای تکراری
محورهای موضوعی : مهندسی برق و کامپیوتر
سیدحسین کاظمی
1
(دانشگاه فردوسی مشهد)
میرمجتبی میرصالحی
2
(دانشگاه فردوسی مشهد)
امیررضا عطاری
3
(دانشگاه فردوسی مشهد)
کلید واژه: عنصر نوری پراشی دریچه محدود روش طیف زاویه‌ای تکراری شکل‌دهنده پرتو D-FDTD3,
چکیده مقاله :
روش طیف زاویه‌ای تکراری (IAS) برای طراحی عناصر نوری پراشی دریچه - محدود یک‌بعدی D -FADOE)1( توسط ملین و نوردین ارائه شده است. ما این روش را برای طراحی عناصر نوری پراشی دریچه - محدود دوبعدی، گسترش داده و با استفاده از آن چند نمونه قطعه اپتیکی طراحی کرده‌ایم. نمونه اول یک منشعب‌کننده 1 به 7 است که یک پرتو تابشی را در مود اصلی، به هفت تار نوری تک مود با بازده پراش 84 درصد جفت می‌کند. نمونه دوم یک تخت‌کننده پرتو گوسی لیزری با بازده پراش 8/74 درصد و نمونه سوم یک منشعب‌کننده پرتو 1 به 3 نامتقارن است. نمونه چهارم شامل سه ریزعدسی با فواصل کانونی مختلف است. الگوی مطلوب توزیع شدت برای این نمونه‌ها در میدان راه نزدیک قرار گرفته است. در ادامه دقت روش تعمیم‌یافته را با مقايسه نتايج با روش سه‌بعدی تفاضل محدود در حوزه زمان D-FDTD)3( با شرایط مرزی جاذب PML بررسی کرده‌ایم. همچنین یک نمونه منشعب‌کننده 1 به 5 ساخته شده و نتایج آزمایش آن ارائه شده است.
The iterative angular spectrum (IAS) method has been introduced by Mellin and Nordin for designing finite-aperture diffractive optical elements (FADOEs). We have extended this method to two-dimensional FADOEs and used it to design some optical devices. The first device is a 1-to-7 beamsplitter that couples an optical beam to seven single-mode optical fibers with a diffraction efficiency of 84%. The second device is a beam-shaper that converts a Gaussian beam into a nearly flat beam with a diffraction efficiency of 74.8%. The third design is a 1-to-3 asymmetric beamsplitter. The fourth design includes three microlenses with different focal lengths. The desired intensity distribution patterns of all these designs are located at the near field region. We have investigated the sensitivity of the extended method by comparing the results obtained by this method with those obtained by three-dimensional finite difference time domain (3-D FDTD) method using perfect matched layer (PML). Also, a 1-to-5 beamsplitter is fabricated and the experimental results are presented.
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