Engineering of metallic nanorod-based hyperbolic metamaterials for broadband applications operating in the infrared regi
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ORIGINAL ARTICLE
Engineering of metallic nanorod‑based hyperbolic metamaterials for broadband applications operating in the infrared regime M. A. Baqir1 · Ali Farmani2 · M. Raza3 · Majid Niaz Akhtar4 · A. Hussain5 Received: 12 August 2020 / Accepted: 28 September 2020 © King Abdulaziz City for Science and Technology 2020
Abstract Metamaterials are manmade structures that have attained considerable attention over the past 2 decades in the modern fields like cloaking, sensing, and imaging owing to their ability to harness electromagnetic fields. In this regard, we have inspected the dielectric properties of the hyperbolic metamaterials (HMM) made of metallic nanorods and dielectric medium at the infrared wavelength regime. The periodically arranged subwavelength-sized metallic nanorods embedded in the silicon dioxide ( SiO2 ) substrate glass. The spacing between two adjacent nanorods is of subwavelength in size. Furthermore, effective permittivity of the metamaterial has been analyzed by employing the Maxwell Garnett effective medium theory. Moreover, different metallic nanorod inclusions (Au, W, Pt and Ti) were taken into account. Hyperbolic features of the metamaterial have been observed, and it is noticed that hyperbolic features merely depend on the type of metallic nanorods and their size. The observations reveal that the dielectric properties of the metamaterial can be tuned by altering the radii of the metallic nanorod. Apart from dispersion, reflection, transmission and absorption features of the HMM are taken into account. It is noticed that reflection, transmission and absorption of the HMM depend on the type of metallic nanorod and its dimension. Such HMMs structures with exotic dielectric features would be useful for sensing, filtering, and absorption applications. Keywords Metamaterial · Nanostructure · Hyperbolic metamaterials
Introduction Metamaterials, as manmade structures display extraordinary properties that are not found in the naturally existing materials (Ling et al. 2015; Wang et al. 2018; Han et al. 2018; Politano et al. 2018; Li et al. 2017, 2018, 2019, 2020; Feng et al. 2020; Qin et al. 2018; Liu et al. 2019). These can manipulate * M. A. Baqir [email protected] 1
Department of Electrical and Computer Engineering, COMSATS University Islamabad, Sahiwal Campus 57000, Pakistan
2
Department of Electrical Engineering, Lorestan University, Khorramabad, Lorestan, Iran
3
Department of Mathematics, COMSATS University Islamabad, Sahiwal Campus, 57000, Pakistan
4
Department of Physics, Muhammad Nawaz Sharif University of Engineering and Technology (MNSUET), Multan 60000, Pakistan
5
Department of Electrical Engineering, University of Management and Technology, Lahore, Pakistan
the electromagnetic/light waves in a fantastic way that in turn produce many unusual properties, such as reversal of Snell’s law, backward waves, reversal of Doppler shift, and so forth (Lemoult et al. 2013; Kadic et al. 2013; Rupin et al. 2014; Baqir and Choudhury 2019). These unprecedented prop
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