Graphene-Based Near-IR Plasmonic Wide-angle Broadband Perfect Absorber
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Graphene-Based Near-IR Plasmonic Wide-angle Broadband Perfect Absorber Banafsheh Yektaparast 1 & Hossein Shirkani 1 Received: 19 March 2020 / Accepted: 3 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Nowadays, graphene is one of the most used materials in the manufacturing of optical instruments, such as sensors, photovoltaic cells, and especially absorbers. The unrivaled ability of graphene in the formation of high-quality surface plasmons creates extraordinary features for absorber devices. Here, by exploiting the nanoplasmonic structure consisting of one-dimensional nanophotonic crystal made of graphene-silver half-ellipse grating next to the dielectric layer, the aim of this research is to achieve broadband absorption and perfect absorber in addition to increasing single-layer and multi-layer graphene absorption by creating surface plasmons and study the absorption spectrum in the near-infrared region. For this purpose, the studied nanostructure is optimized under different incident angles, geometric parameters of the structure, and also the dielectric refractive index. The proposed structure increases the absorption of graphene up to 85% along with wondrous absorption bandwidth over the entire near-infrared region from 770 to 3000 nm. In addition to achieving broadband plasmonic perfect absorber, an ultra-broadband, nearly perfect absorber, with the absorption of more than 80% in the whole near-infrared spectral zone has been introduced whose wide range of 1497 nm has an absorption above 90%. This range is far beyond the bandwidth of less than 1200 nm of conventional absorbers. In addition to high strength and low angular sensitivity, this absorber has the wonderful ability to effective absorb the solar radiation and can display abundant applications in solar cells, thermal emitters, and infrared detectors. Keywords Graphene . Perfect absorber . Ultra broadband . Nanoplasmonic . Infrared spectrum
Introduction Graphene is a single-layer material made of carbon and based on the honeycomb lattice. The high mobility, environmental sustainability, and the photonic, mechanical, and optoelectronic properties of this quasi-metal with zero band gap are wonderful [1–5]. Graphene is a very thin material with a thickness of about 0.34 nm, but high strength which makes it stronger than steel [6, 7]. It is an abundant and low-cost material due to its properties that has a high flexibility to combine with other materials. This feature makes it suitable to be used in nanostructure and especially photonic structures [6, 8, 9]. The use of onedimensional photonic structures along with graphene and also the combination of graphene with plasmonic structures can increase the 2.3% absorption of this transparent material. The rise of graphene progress and the materials based on it in terms of manufacturing and improving the performance of * Hossein Shirkani [email protected] 1
Nano and Bio Science and Technology Department, Persian Gulf University, Bushehr 75169, Iran
optical and op
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