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Nanostructured Tungsten Disulfide WS2 as Mie Scatterers and Nanoantennas

Published online by Cambridge University Press:  16 March 2020

Hasan Ahmed  and
Viktoriia E. Babicheva Open the ORCID record for Viktoriia E. Babicheva [Opens in a new window]
Hasan Ahmed
Affiliation:
Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM
Viktoriia E. Babicheva*
Affiliation:
Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM
*
*Email: vbb@unm.edu
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Abstract

Nanoparticles of high-refractive-index materials like semiconductors can achieve confinement of light at the subwavelength scale because of the excitation of Mie resonances. The nanostructures out of high-refractive-index materials have extensively been studied theoretically and realized in experiments exploring a wide range of photonic applications. Recently, transition metal dichalcogenides (TMDCs) from the family of van der Waals layered materials have been shown to exhibit tailorable optical properties along with high refractive index and strong anisotropy. We envision that TMDCs are a promising material platform for designing metasurfaces and ultra-thin optical elements: these van der Waals materials show a strong spectral response on light excitations in visible and near-infrared ranges, and metasurface properties can be controlled by nanoantenna dimensions and their arrangement. In this work, we investigate a periodic array of disk-shaped nanoantennas made of a TMDC material, tungsten disulfide WS2, placed on top of a silicon layer and oxide substrate. We show that the nanostructure resonance in TMDC disk-shaped nanoantenna array can be controlled by the variation in silicon layer thickness and have a dependence on the presence of index-match superstrate cover. We also report on the spectral features in absorption and reflection profiles of the same structure with different surrounding index.

Keywords

layeredoptoelectronicopticalphotonic
Type
Articles
Information
MRS Advances , Volume 5 , Issue 35-36: Electronic, Photonic and Magnetic Materials , 2020 , pp. 1819 - 1826
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Copyright
Copyright © Materials Research Society 2020

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