Unexpected Near-Infrared to Visible Nonlinear Optical Properties from 2-D Polar Metals.

Data de publicação: Data Ahead of Print:

Autores da FMUP

  • João De Almeida Lopes Da Fonseca

    Autor

Participantes de fora da FMUP

  • Steves MA
  • Wang Y
  • Briggs N
  • Zhao T
  • El-Sherif H
  • Bersch BM
  • Subramanian S
  • Dong C
  • Bowen T
  • Fuente Duran A
  • Nisi K
  • Lassaunière M
  • Wurstbauer U
  • Bassim ND
  • Robinson JT
  • Crespi VH
  • Robinson J
  • Knappenberger KL Jr

Unidades de investigação

Abstract

Near-infrared-to-visible second harmonic generation from air-stable two-dimensional polar gallium and indium metals is described. The photonic properties of 2D metals, including the largest second-order susceptibilities reported for metals (approaching 10 nm/V), are determined by the atomic-level structure and bonding of two-to-three-atom-thick crystalline films. The bond character evolved from covalent to metallic over a few atomic layers, changing the out-of-plane metal-metal bond distances by approximately ten percent (0.2 Å), resulting in symmetry breaking and an axial electrostatic dipole that mediated the large nonlinear response. Two different orientations of the crystalline metal atoms, corresponding to lateral displacements <2 Å, persisted in separate micrometer-scale terraces to generate distinct harmonic polarizations. This strong atomic-level structure-property interplay suggests metal photonic properties can be controlled with atomic precision.

Dados da publicação

ISSN/ISSNe:
1530-6992, 1530-6984

Nano Letters  American Chemical Society

Tipo:
Article
Páginas:
8312-8318

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Keywords

  • 2D materials; 2D metals; confinement heteroepitaxy; nonlinear photonics; polar metals; second harmonic generation

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