Çift Asimetrik Dielektrik Meta Yüzeylere Dayalı Dar Bant Genişliği ve Ayarlanabilir Orta Kızılötesi Termal Yayıcı

Öz

Orta kızılötesi (MIR) bölgesinde çalışan termal yayıcılar, algılama, termofotovoltaik ve görüntüleme gibi birçok uygulamada vazgeçilmezdir. Rezonans dalga boyu ayarlanabilirliği, yüksek verimlilik, maliyet etkinliği ve yüksek kalite (Q) faktörü termal yayıcıların arzu edilen özellikleridir. Seçici termal yayıcılar, omik kayıplar nedeniyle çok keskin yayınım tepeleri sergilemeyen metalik meta yüzeyler kullanılarak gerçekleştirilmiştir. Son yıllarda, süreklilikteki yarı bağlı durumlardan yararlanan asimetrik özelliklere sahip dielektrik malzemelerden yapılmış meta yüzeyler çok yüksek Q faktörleri ile tanıtılmıştır. Şimdiye kadar literatürde gösterilen dielektrik meta yüzey tabanlı termal yayıcılar, rezonatörlerin uzunluk farkı veya rezonatörlerin açısal ayrımı gibi tek bir asimetri türüne sahiptir. Bununla birlikte, birden fazla asimetri türüne sahip olarak, rezonans dalga boyu ve termal yayınım bağımsız olarak ayarlanabilir. Bu çalışmada, rezonatör olarak farklı uzunluklarda silikon dikdörtgen çubukların zikzak dizisinden oluşan bir yapı önerilmektedir. Alt tabaka olarak altın seçilmiştir ve silikon çubuklar ile altın arasında yer alan Al2O3'ten yapılmış bir dielektrik ara tabaka bulunmaktadır. Silikon çubuklar 0,3 uzunluk asimetri faktörü ile orijinden π/25 oranında ayrıldığında 5,818 µm rezonans dalga boyunda 116 Q faktörü ile 0,99'u aşan bir emisivite değeri elde edilmiştir. Ek olarak, emisivite yoğunluğunun ve rezonans dalga boyunun bağımsız olarak ayarlanması gösterilmiştir. Bu tür bulgular ihtiyaca özel termal yayıcı tasarımlarına yol açabilecektir.

Anahtar Kelimeler

• Termal yayıcı
• dielektrik meta yüzey
• yüksek Q rezonatörler
• ayarlanabilir meta yüzey

Narrow Bandwidth and Tunable Mid-Infrared Thermal Emitter Design Based on Double Asymmetric Dielectric Metasurfaces

Öz

Thermal emitters working in the mid-infrared (MIR) region are indispensable in many applications, such as sensing, thermophotovoltaics, and imaging. Resonance wavelength tunability, high efficiency, cost-effectiveness, and high quality (Q) factor are desirable properties of thermal emitters. Selective thermal emitters have been realized using metallic metasurfaces, which, due to ohmic losses, do not exhibit very sharp emission peaks. Recently, metasurfaces possessing very high Q factors made of dielectric materials with asymmetric features that exploit quasi-bound states in the continuum are introduced. The dielectric metasurface-based thermal emitters shown in the literature have a single type of asymmetry, such as a difference in the length of resonators or angular separation of resonators. However, resonance wavelength and thermal emissivity could be tuned by having multiple types of asymmetries. This study proposes a structure consisting of a zigzag array of silicon rectangular bars with different lengths as resonators. Gold is the choice of the substrate with a dielectric layer made of Al2O3 sandwiched between gold substrate and silicon bars. Based on the conducted simulations, an emissivity value exceeding 0.99 with a Q factor of 116 at the resonance wavelength of 5.818 µm was obtained when the silicon bars were separated by π/25 from the origin in opposite directions with a length asymmetry factor of 0.3. Additionally, independent tuning of emissivity intensity and resonance wavelength is displayed. Such findings can lead to bespoke thermal emitter designs.

Anahtar Kelimeler

• Thermal emitter
• dielectric metasurface
• high-Q resonators
• tunable metasurface

Kaynakça

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