مجله فصل مشترک ها، لایه های نازک و سیستم های با بعد کم
مدلسازی یک مدولاتور پهن باند در ناحیه فروسرخ میانی با کارایی بالا با استفاده از موجبر پلاسمونیکی مخلوط بر پایه ی گرافن
نوع مقاله : مقاله پژوهشی
نویسندگان
1 تهران، دانشگاه الزهرا، دانشکده فیزیک، بخش فیزیک ماده چگال
2 گروه فیزیک، دانشکده علوم، دانشگاه علوم دریایی امام خمینی (ره)، نوشهر، ایران
چکیده
یک موجبر پلاسمونیک هیبریدی مبتنی بر گرافن (GHPW) با ساختار هندسی منحصر به فرد برای هدایت و مدولاسیون پلاریتون پلاسمون سطحی (SPP) در محدوده فرکانس 30-10 THz طراحی شده است. این موجبر از یک لایه گرافن در وسط، یک لایه دریچه ای پلی اتیلن با چگالی بالا (HDPE) و دو لایه جداکننده دی الکتریک داخلی و دو زیرلایه ژرمانیوم نیمه استوانه ای تشکیل شده است که به طور متقارن در هر دو لبه گرافن تعبیه شده اند. برای انتشار مدهای SPP در ناحیه فرکانسی 10-30 تراهرتز، ناحیه مدی کوچک( 4-10~) و طول انتشار بلند (10.67-28.92 میکرومتر) در انرژی فرمی 1.0 الکترون ولت، بدست آمده است. با کنترل انرژی فرمی گرافن، مشخص شد که به ازای گستره فرکانسی 30-10 تراهرتز، این ساختار دارای عمق مدولاسیون بالاتر از 20 درصد است و در فرکانس بیشتر از 28.75 تراهرتز به بیشینه مقدار خود می رسد. موجبر پیشنهاد شده، نوید بخش بهره مندی از انتشار پهن باند با راندمان مدولاسیونی بالا، و ایجاد نسل متفاوتی از موجبرهای MIR، مدولاتورها، و دستگاه‌های فوتونیکی و نوری را می دهد.
کلیدواژه‌ها
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