حسگر دما بر اساس موجبر شکافی پلاسمونی تراهرتز تزویج‌شده به تشدیدگر
محورهای موضوعی : مهندسی برق و کامپیوتر
علیرضا دولت آبادی
1
(دانشكده فنی و مهندسی، دانشگاه آیت الله بروجردی)
کلید واژه: ایندیم اَنتیموناید, پلاسمونی, تراهرتز, تشدیدگر, حسگر دما,
چکیده مقاله :
در این مقاله، عملکرد یک حسگر دما بر اساس ساختار پلاسمونی شامل یک موجبر شکافی تزویج‌شده به یک تشدیدگر بررسی شده است. نتایج بر اساس وابستگی معادله پاشندگی ساختار و در نتیجه فرکانس تشدید تشدیدگر به ضریب گذردهی الکتریکی ماده سازنده ساختار یعنی ایندیم اَنتیموناید بهدست آمده که ضریب گذردهی یادشده هم به دمای محیط وابسته است. طراحی ساختار برای بخشی از فرکانسهای طیف تراهرتز انجام شده و نتایج شبیهسازی، بیانگر رابطهای تقریباً خطی بین فرکانسهای تشدید و دمای محیط در بازه دمایی 260 تا 350 درجه کلوین است. همچنین معیاری برای بررسی حساسیت و بازه دمایی عملکردی حسگر ارائه‌‌شده بیان گردیده است. حساسیت این حسگر در بازه دمایی ذکرشده به میزان 10-10× 1 درجه کلوین بر هرتز محاسبه شده و حد تفکیک اندازهگیری دمای آن به حد تفکیک اندازهگیری فرکانس سامانه آشکارساز وابسته است. این حسگر با ساختار ساده خود میتواند در سامانههای متعدد شیمیایی و زیستی بهکار گرفته شود.
In this paper, the performance of a temperature sensor based on plasmonic structure including a slot waveguide coupled with a stub resonator has been investigated. The results have been attained based on the dependency of dispersion equation, and so, the resonance frequency of the stub, to electric permittivity of the constructing material of the structure, InSb, which is also dependent to the ambient temperature. The design of the structure has been carried out for frequencies in terahertz spectra. The simulation results confirm an approximate linear relation between the resonance frequencies and ambient temperature, between 260-350 Kelvin. Also, a criterion has been assigned for evaluation the sensitivity and the performance temperature span of the proposed sensor. The calculated sensitivity is about 1×10-10 Kelvin per Hertz in the mentioned temperature interval. The sensor measurement resolution depends on the frequency resolution of the detection system. This simple sensor can be utilized in various chemical and bio systems.
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