İki Boyutlu Silindirik Dağıtıcılı Sonik Kristal Yapılarının Akustik Lens Özelliklerinin ZamanBölgesi Sonlu Fark Simülasyonları ile İncelenmesi

Fotonik kristallerde gözlemlenen birçok dalga yayılım özellikleri sonraları sonik kristallerüzerinde gösterilmiştir. Sonik kristal yapılar negatif kırınım, düzlem lens, dalga kılavuzları gibi birçokakustik dalga uygulamasına imkân sağlayan akustik metamateriyaldir ve sonic kristal uygulamaları sonyılarda yoğun bir şekilde çalışılmaktadır. Bu çalışmada iki boyutlu temel sonik kristal yapıları kısacatanıtılmakta ve zaman bölgesi sonlu farklar (Finite Difference Time Domain-FDTD) yöntemisimülasyon sonuçları ile sonik kristal yapılarda negatif kırınım özelliği ve dalga odaklamauygulamalarının bir incelemesini sunulmaktadır. Negatif kırınım ve buna bağlı olarak gerçekleşenakustik dalgaların odaklanmasını konu alan pek çok çalışma bulunmaktadır. Bu çalışma bu konudayapılan önemli çalışmaları kısaca incelenmekte ve zaman bölgesi sonlu farklar yöntemi simülasyonlarıyardımı ile negatif kırınım ve bununla ilişkili akustik dalga odaklanma olaylarının zaman bölgesisimülasyon sonuçlarını sunmaktadır. Araştırma sonuçları zaman bölgesi sonlu farklar simülasyonlarınınsonik kristal düzlem lens tasarımı çalışmalarında kullanılabileceğini göstermiştir.

Investigation of Acoustic Lens Properties of Two-dimensional Cylindrical Scatterer Sonic Crystal Structures via Finite Difference Time Domain Simulations

Many wave propagation properties, which were observed in photonic crystals, have beendemonstrated for sonic crystals, later. The sonic crystal structures are acoustic metamaterials that allowacoustic wave applications such as negative refraction, flat lens, wave guides, and their applicationshave been intensively studied in recent years. This study introduces fundamental two-dimensional soniccrystal structures and presents an overview for the negative refraction properties and its wave focusingapplications by using Finite Difference Time Domain (FDTD) simulation results. There are manystudies that address negative refraction and its associated phenomenon acoustic wave focusing. Thisstudy briefly reviews some important studies related to this topic and presents time-domain simulationresults in order to illustrate negative refraction and the related acoustic wave focusing phenomenon bymeans of FDTD simulations. Research findings indicates that FDTD simulations can be used for designtasks of sonic crystal flat lens.

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