TY - JOUR
T1 - Light–Matter Interaction in Quantum Confined 2D Polar Metals
AU - Nisi, Katharina
AU - Subramanian, Shruti
AU - He, Wen
AU - Ulman, Kanchan Ajit
AU - El-Sherif, Hesham
AU - Sigger, Florian
AU - Lassaunière, Margaux
AU - Wetherington, Maxwell T.
AU - Briggs, Natalie
AU - Gray, Jennifer
AU - Holleitner, Alexander W.
AU - Bassim, Nabil
AU - Quek, Su Ying
AU - Robinson, Joshua A.
AU - Wurstbauer, Ursula
N1 - Publisher Copyright:
© 2020 The Authors. Published by Wiley-VCH GmbH
PY - 2021/1/22
Y1 - 2021/1/22
N2 - This work is a systematic experimental and theoretical study of the in-plane dielectric functions of 2D gallium and indium films consisting of two or three atomic metal layers confined between silicon carbide and graphene with a corresponding bonding gradient from covalent to metallic to van der Waals type. k-space resolved free electron and bound electron contributions to the optical response are identified, with the latter pointing towards the existence of thickness dependent quantum confinement phenomena. The resonance energies in the dielectric functions and the observed epsilon near-zero behavior in the near infrared to visible spectral range, are dependent on the number of atomic metal layers and properties of the metal involved. A model-based spectroscopic ellipsometry approach is used to estimate the number of atomic metal layers, providing a convenient route over expensive invasive characterization techniques. A strong thickness and metal choice dependence of the light–matter interaction makes these half van der Waals 2D polar metals attractive for quantum engineered metal films, tunable (quantum-)plasmonics and nano-photonics.
AB - This work is a systematic experimental and theoretical study of the in-plane dielectric functions of 2D gallium and indium films consisting of two or three atomic metal layers confined between silicon carbide and graphene with a corresponding bonding gradient from covalent to metallic to van der Waals type. k-space resolved free electron and bound electron contributions to the optical response are identified, with the latter pointing towards the existence of thickness dependent quantum confinement phenomena. The resonance energies in the dielectric functions and the observed epsilon near-zero behavior in the near infrared to visible spectral range, are dependent on the number of atomic metal layers and properties of the metal involved. A model-based spectroscopic ellipsometry approach is used to estimate the number of atomic metal layers, providing a convenient route over expensive invasive characterization techniques. A strong thickness and metal choice dependence of the light–matter interaction makes these half van der Waals 2D polar metals attractive for quantum engineered metal films, tunable (quantum-)plasmonics and nano-photonics.
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U2 - 10.1002/adfm.202005977
DO - 10.1002/adfm.202005977
M3 - Article
AN - SCOPUS:85092592460
SN - 1616-301X
VL - 31
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 4
M1 - 2005977
ER -