Anisotropic Plasmonic CuS Nanocrystals as a Natural Electronic Material with Hyperbolic Optical Dispersion

R. Margoth Córdova-Castro; Marianna Casavola; Mark Van Schilfgaarde; Alexey V. Krasavin; Mark A. Green; David Richards; Anatoly V. Zayats

doi:10.1021/acsnano.9b00282

Anisotropic Plasmonic CuS Nanocrystals as a Natural Electronic Material with Hyperbolic Optical Dispersion

R. Margoth Córdova-Castro^*, Marianna Casavola, Mark Van Schilfgaarde, Alexey V. Krasavin, Mark A. Green, David Richards, Anatoly V. Zayats

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

310 Downloads (Pure)

Abstract

Copper sulfide nanocrystals have recently been studied due to their metal-like behavior and strong plasmonic response, which make them an attractive material for nanophotonic applications in the near-infrared spectral range; however, the nature of the plasmonic response remains unclear. We have performed a combined experimental and theoretical study of the optical properties of copper sulfide colloidal nanocrystals and show that bulk CuS resembles a heavily doped p-type semiconductor with a very anisotropic energy band structure. As a consequence, CuS nanoparticles possess key properties of relevance to nanophotonics applications: they exhibit anisotropic plasmonic behavior in the infrared and support optical modes with hyperbolic dispersion in the 670-1050 nm spectral range. We also predict that the ohmic loss is low compared to conventional plasmonic materials such as noble metals in the NIR. The plasmonic resonances can be tuned by controlling the size and shape of the nanocrystals, providing a playground for future nanophotonic applications in the near-infrared.

Original language	English
Pages (from-to)	6550-6560
Number of pages	11
Journal	ACS Nano
Volume	13
Issue number	6
Early online date	22 May 2019
DOIs	https://doi.org/10.1021/acsnano.9b00282
Publication status	Published - 25 Jun 2019

Keywords

anisotropic plasmonic
colloidal nanocrystals
hyperbolic dispersion
localized surface plasmons
plasmonics

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10.1021/acsnano.9b00282

Anisotropic Plasmonic CuS Nanocrystals_CORDOVA-CASTRO_Accepted 21 May 2019_GREEN AAMAccepted author manuscript, 2.76 MB

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abstract = "Copper sulfide nanocrystals have recently been studied due to their metal-like behavior and strong plasmonic response, which make them an attractive material for nanophotonic applications in the near-infrared spectral range; however, the nature of the plasmonic response remains unclear. We have performed a combined experimental and theoretical study of the optical properties of copper sulfide colloidal nanocrystals and show that bulk CuS resembles a heavily doped p-type semiconductor with a very anisotropic energy band structure. As a consequence, CuS nanoparticles possess key properties of relevance to nanophotonics applications: they exhibit anisotropic plasmonic behavior in the infrared and support optical modes with hyperbolic dispersion in the 670-1050 nm spectral range. We also predict that the ohmic loss is low compared to conventional plasmonic materials such as noble metals in the NIR. The plasmonic resonances can be tuned by controlling the size and shape of the nanocrystals, providing a playground for future nanophotonic applications in the near-infrared.",

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author = "C{\'o}rdova-Castro, {R. Margoth} and Marianna Casavola and {Van Schilfgaarde}, Mark and Krasavin, {Alexey V.} and Green, {Mark A.} and David Richards and Zayats, {Anatoly V.}",

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AU - Córdova-Castro, R. Margoth

AU - Casavola, Marianna

AU - Van Schilfgaarde, Mark

AU - Krasavin, Alexey V.

AU - Green, Mark A.

AU - Richards, David

AU - Zayats, Anatoly V.

PY - 2019/6/25

Y1 - 2019/6/25

N2 - Copper sulfide nanocrystals have recently been studied due to their metal-like behavior and strong plasmonic response, which make them an attractive material for nanophotonic applications in the near-infrared spectral range; however, the nature of the plasmonic response remains unclear. We have performed a combined experimental and theoretical study of the optical properties of copper sulfide colloidal nanocrystals and show that bulk CuS resembles a heavily doped p-type semiconductor with a very anisotropic energy band structure. As a consequence, CuS nanoparticles possess key properties of relevance to nanophotonics applications: they exhibit anisotropic plasmonic behavior in the infrared and support optical modes with hyperbolic dispersion in the 670-1050 nm spectral range. We also predict that the ohmic loss is low compared to conventional plasmonic materials such as noble metals in the NIR. The plasmonic resonances can be tuned by controlling the size and shape of the nanocrystals, providing a playground for future nanophotonic applications in the near-infrared.

AB - Copper sulfide nanocrystals have recently been studied due to their metal-like behavior and strong plasmonic response, which make them an attractive material for nanophotonic applications in the near-infrared spectral range; however, the nature of the plasmonic response remains unclear. We have performed a combined experimental and theoretical study of the optical properties of copper sulfide colloidal nanocrystals and show that bulk CuS resembles a heavily doped p-type semiconductor with a very anisotropic energy band structure. As a consequence, CuS nanoparticles possess key properties of relevance to nanophotonics applications: they exhibit anisotropic plasmonic behavior in the infrared and support optical modes with hyperbolic dispersion in the 670-1050 nm spectral range. We also predict that the ohmic loss is low compared to conventional plasmonic materials such as noble metals in the NIR. The plasmonic resonances can be tuned by controlling the size and shape of the nanocrystals, providing a playground for future nanophotonic applications in the near-infrared.

KW - anisotropic plasmonic

KW - colloidal nanocrystals

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KW - localized surface plasmons

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Anisotropic Plasmonic CuS Nanocrystals as a Natural Electronic Material with Hyperbolic Optical Dispersion

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Keywords

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