اثر پارامترهای هندسی بر طیف گسیل گرمایی میکروکاواک‌های دوره‌ای فلز کروم

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

دانشکده الکتروسرام و مهندسی برق، دانشگاه صنعتی مالک اشتر، شاهین شهر، ایران

چکیده

در این تحقیق اثر پارامترهای هندسی و دما بر طیف تابش گرمایی نانو/میکروکاواک‌های دوره‌ای هوا با ساختار مربعی در بستر فلز کروم بررسی شده است. نتایج به دست آمده نشان می‌دهند که برانگیختگی مدهای تشدیدی کاواک، پلاسمون- پلاریتون سطحی و مدهای پراشی براگ در تعیین طیف تابشی و میزان گزینش‌پذیری آن موثر می‌باشند. در کاواک‌های باریک و کم عمق با شعاع ‌ nm150r< و عمق nm150d<، طیف گسیل گرمایی رفتاری مشابه‌ی لایه فلز کروم دارد. برانگیختگی پلاسمون-پلاریتون‌های سطحی سبب ایجاد قله تیزی در طیف تابشی میکروکاواک‌های با عمق nm‌250≤d≤150 و شعاع nm300≤r≤150 در طول موج λ~a می‌شود. در کاواک‌های پهن و عمیق با ‌ nm350r≥ و ‌ nm400d≥ در طیف تابشی قله-هایی وجود دارند که با طول موج‌های تشدیدی کاواک‌ اصلاح شده مطابقت دارند. در طول موج‌های کوچکتر از دوره، پراش براگ از سطح میکروکاواک‌ها گسیلندگی را کاهش می‌دهد. با افزایش دما گزینش پذیری در گسیلندگی تغییرات قابل توجهی ندارد. با پوشش‌دهی سطح ساختار با یک فلز بازتاب دهنده‌ی قوی مانند تانتالوم، گزینش‌پذیری و بازده گسیلی به میزان قابل توجهی افزایش می‌یابد که برای کاربرد در گسیلنده‌های ترموفوتوولتایی اهمیت زیادی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Geometrical Parameters on thermal emission spectrum of Two-dimensional Chromium Periodic Microcavities

نویسندگان [English]

  • Armin Moghbeli
  • Ali Rostamnejadi
  • Meysam Daneshvar
Department of Electroceramics and Electrical Engineering, Malek Ashtar University of Technology, Shahinshahr, Iran
چکیده [English]

In this paper, the effects of structural parameters and temperature on the thermal emission properties of a square array of cylindrical nano/microcavities on chromium (Cr) slab have been investigated. The obtained results show that the enhancement and selectivity in the emissivity are depended on the coupling between thermally excited radiation with the resonance modes, surface plasmon-polariton and Bragg diffraction from the surface of the periodic nano/microcavities. For nanocavities with radius r

کلیدواژه‌ها [English]

  • Selective Thermal emitter
  • Surface plasmon-polariton
  • Periodic Nano/Microcavity
  • Bragg diffraction
  • Thermophotovoltaic
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