Spektral olarak ayarlanabilir ve polarizasyon bağımsız çift bant plazmonik mükemmel soğurucunun sayısal analizi

Bu çalışmada, orta kızılötesi bölgede çalışan çift bant rezonans frekansına sahip yeni bir plazmonik mükemmel soğurucu yapısı sunulmuştur. Yapının analizleri, ticari bir yazılım programı yardımıyla gerçekleştirilmiştir. Önerilen mükemmel soğurucu yapısı, gelen ışını düşük frekans modunda %98' in üzerinde ve yüksek frekans modunda % 99' un üzerinde soğurmaktadır. Soğurum mekanizmasında etkili bir rol oynayan iletken ve dielektrik tabaka kalınlıklarının değişimi incelenerek çalışmada kullanılacak olan kalınlık değerleri belirlenmiştir. Dielektrik tabaka üzerine konumlandırılmış nanoanten dizisinin geometrik parametreleri değiştirilerek bu parametrelerin rezonans modlara etkisi incelenmiş ve bu modların ayarlanabilirliği nanoanten dizisi için analiz edilmiştir. Polarizasyon bağımsızlığı üç farklı kutuplanma açısı için analiz edilmiştir. İncelenen açı değerlerinde yapının polarizasyondan bağımsız olduğu ortaya konmuştur. Çalışmada ayrıca yük yoğunluğu dağılımları ile rezonans modları için elektrik ve manyetik alan dağılımlarının soğurum spektrumları incelenmiştir. Ayarlanabilir spektral özellikleri, polarizasyon bağımsız olması, güçlendirilmiş elektrik ve manyetik cevapları sayesinde önerilen plazmonik mükemmel soğurucu, orta kızılötesi spektroskopi uygulamalarında kullanılabilir.

Anahtar Kelimeler:

Perfect absorbers, Plasmonics, Biosensing applications, Nanophotonics, FDTD simulations

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