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Open Access Simulation of tunable metamaterial perfect absorber by modulating Bi2Se3 dielectric function

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We numerically present an effective method for tuning the intrinsic resonance of metamaterial perfect absorber by taking advantage of phase transition in a topological insulator (bismuth selenide, Bi2Se3) in the near-infrared (NIR) region. The design consists of an array of square Au rods separated from a continuous Au film by a Bi2Se3 dielectric interlayer. It is shown that a large shift of 280 nm in the resonance wavelength can be obtained by switching Bi2Se3 between its trigonal and orthorhombic states. The strong absorbance shows a substantial overlap between TE and TM polarization states over a wide range of incident angles.

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Keywords: DIELECTRIC; FUNCTION; METAMATERIALS; PERFECT ABSORBER; SIMULATION; SURFACE PLASMONS; TOPOLOGICAL INSULATOR; TUNABLE

Document Type: Research Article

Publication date: February 1, 2016

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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