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Modeling a high-performance broadband mid-infrared modulator using graphene-based hybrid plasmonic waveguide | ||
| Journal of Interfaces, Thin Films, and Low dimensional systems | ||
| دوره 5، شماره 2، اردیبهشت 2022، صفحه 505-515 اصل مقاله (2.1 M) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22051/jitl.2023.42299.1077 | ||
| نویسندگان | ||
| Mohamad Reza Jafari* 1؛ Akbar Asadi2 | ||
| 1Department of Condensed Matter, Faculty of Physics, Alzahra University, Tehran, Iran | ||
| 2Department of Physics, Faculty of Science, Imam Khomeini Naval Academy, Nowshahr, Iran | ||
| چکیده | ||
| A graphene-based-hybrid plasmonic waveguide (GHPW) with a unique geometric structure is designed for surface plasmon polariton guidance and modulation at the frequency area of 10 to 30 THz. The GHPW consists of a graphene layer in the middle, a high-density polyethylene (HDPE) gating layer, two interior dielectric delimiter layers, and two exteriors semi-cylinder Germanium substrates symmetrically embedded on both edges of the graphene. Because of the matchless semi-cylinder structure design, the electromagnetic wave interaction with graphene ultimate subwavelength SPPs strong confinement with long propagation length. Small normalized mode area of ~10-4 and long propagation length of 10.67-28.92 μm at Fermi energy of 1.0 eV is attained for SPPs modes propagation of the GHPW in the frequency bound of 10-30 THz and semi-cylinder radius R > 450 nm, respectively. By controlling the graphene Fermi energy, it is found that the structure has a modulation depth higher than 20 % for the frequency band of 10-30 THz and arrives at the peak of approximately 100 % at a frequency greater than 28.75 THz. To benefit from the great broadband MIR propagation and modulation efficiency, the GHPW may promise different MIR waveguides, modulators, photonic, and optoelectronic devices. | ||
| کلیدواژه‌ها | ||
| Graphene؛ Plasmonic؛ Waveguide؛ Modulator؛ mid-infrared؛ Finite element method | ||
| عنوان مقاله [English] | ||
| مدلسازی یک مدولاتور پهن باند در ناحیه فروسرخ میانی با کارایی بالا با استفاده از موجبر پلاسمونیکی مخلوط بر پایه ی گرافن | ||
| نویسندگان [English] | ||
| محمدرضا جعفری1؛ اکبر اسدی2 | ||
| 1تهران، دانشگاه الزهرا، دانشکده فیزیک، بخش فیزیک ماده چگال | ||
| 2گروه فیزیک، دانشکده علوم، دانشگاه علوم دریایی امام خمینی (ره)، نوشهر، ایران | ||
| چکیده [English] | ||
| 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 [English] | ||
| گرافن, پلاسمونیک, موجبر, مدولاتور, فروسرخ میانی, روش المان محدود | ||
| مراجع | ||
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