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Title: Dysprosium-doped cadmium oxide as a gateway material for mid-infrared plasmonics

The interest in plasmonic technologies surrounds many emergent optoelectronic applications, such as plasmon lasers, transistors, sensors and information storage. Although plasmonic materials for ultraviolet–visible and near-infrared wavelengths have been found, the mid-infrared range remains a challenge to address: few known systems can achieve subwavelength optical confinement with low loss in this range. With a combination of experiments and ab initio modelling, here we demonstrate an extreme peak of electron mobility in Dy-doped CdO that is achieved through accurate ‘defect equilibrium engineering’. In so doing, we create a tunable plasmon host that satisfies the criteria for mid-infrared spectrum plasmonics, and overcomes the losses seen in conventional plasmonic materials. In particular, extrinsic doping pins the CdO Fermi level above the conduction band minimum and it increases the formation energy of native oxygen vacancies, thus reducing their populations by several orders of magnitude. The substitutional lattice strain induced by Dy doping is sufficiently small, allowing mobility values around 500 cm2 V–1 s–1 for carrier densities above 1020 cm–3. As a result, our work shows that CdO:Dy is a model system for intrinsic and extrinsic manipulation of defects affecting electrical, optical and thermal properties, that oxide conductors are ideal candidates for plasmonic devices andmore » that the defect engineering approach for property optimization is generally applicable to other conducting metal oxides.« less
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [4] ;  [4] ;  [1] ;  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Duke Univ., Durham, NC (United States)
  3. Univ. of Virginia, Charlottesville, VA (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1476-1122; nmat4203
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 14; Journal Issue: 4; Journal ID: ISSN 1476-1122
Nature Publishing Group
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
nanophotonics and plasmonics