Journal of Interfaces, Thin Films, and Low dimensional systems
The effect of the geometrical parameters and composing materials type on the bandgap width of two-dimensional phononic crystals
Document Type : Original Article
Authors
1 Department of Physics, Faculty of Science, Qom University of Technology, Qom, Iran.
2 Department of Electrical and Computer Engineering, Qom University of Technology, Qom, Iran
Abstract
In this article, the bandgap of the two-dimensional phononic crystal with some holes in a square plane was studied using the finite element method in the Comsol software. The holes are made of both some solids and liquids simultaneously in our phononic crystals that is less studied so far. We examined the fixed lattice constant while the cavity radius changes and vice versa. We found a larger bandgaps width when the cavity was made of nickel metal while the surrounding media is water. We; observed that the system with higher sound speed possesses more significant band gap.At higher temperatures, we will have a higher sound speed, and thus, a higher bandgap width. we have a smaller bandgap when the holes are covered by metal. The main aim of the manuscript was to find an optimum structure that have a phononic crystal with largest passible phononic band gap for filtering properties applications. In this way, we have considered the effect of different parameters such as lattice constant, composing materials, phononic crystal geometry, temperature on the phononic bandgap width.
Keywords
Main Subjects
Article Title [Persian]
اثر پارامترهای هندسی و مواد تشکیل دهنده روی عرض گاف نواری بلورهای فونونی دو بعدی
Authors [Persian]
- مهدی سلیمانی 1
- پریسا محمودی 2
1 دانشکده فیزیک، دانشگاه صنعتی قم، قم، ایران.
2 دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی قم، قم، ایران.
Abstract [Persian]
در این مقاله، گاف نواری بلور فوتونی دو بعدی با چند سوراخ در صفحه مربعی با استفاده از روش اجزا محدود در نرم افزار کامسول مورد بررسی قرار گرفت. حفره ها از چند جامد و مایع در بلورهای صوتی ساخته شده اند که تاکنون کمتر مورد مطالعه قرار گرفته است. ما اثر ثابت شبکه ثابت را در حالی که شعاع حفره تغییر می‌کند و بالعکس بررسی کردیم. هنگامی که حفره از فلز نیکل ساخته شده بود، در حالی که محیط اطراف آن آب بود، عرض باند بزرگتری پیدا کردیم. مشاهده شد که سیستم با سرعت صوت بالاتر دارای شکاف باند بزرگتری است. در دماهای بالاتر، سرعت صوت بالاتر و در نتیجه پهنای باند بیشتری خواهیم داشت. هنگامی که سوراخ ها با فلز پر می شوند، گاف نواری کوچکتری داریم. هدف اصلی این مقاله یافتن ساختاری بهینه ای بود که دارای گاف نواری بزرگتری برای کاربردهای فیلتری باشد. به این ترتیب تأثیر پارامترهای مختلفی مانند ثابت شبکه، مواد تشکیل دهنده، هندسه بلور فونونی و دما بر روی پهنای کاف فونونی بررسی شده است.
Keywords [Persian]
- بلور فونونی
- گاف نواری
- ثابت شبکه
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