Journal article
Tunable, Homoepitaxial Hyperbolic Metamaterials Enabled by High Mobility CdO
Advanced optical materials, Vol.11(1), pp.2202137-n/a
01/01/2023
DOI: 10.1002/adom.202202137
Abstract
Propagating light exhibits hyperbolicity in strongly anisotropic materials where the principal components of the dielectric tensor are opposite in sign. While hyperbolicity occurs naturally in anisotropic polar dielectrics, wherein optical phonons along orthogonal crystal axes are nondegenerate, such optical anisotropy can also be engineered in hyperbolic metamaterials (HMMs): thin film superlattices of alternating dielectric and metallic layers. Contrasted with the severely limited tunability of natural hyperbolic materials, the hyperbolic behavior of HMMs can be tailored significantly both through superlattice design and material selection. However, so far HMMs have suffered from high optical losses, hindering their performance. In this report, broadly tunable (lambda = 2-5 mu m) Type I and II hyperbolic modes with low losses (quality (Q)-factors up to 19.7) are observed through attenuated total reflectance measurements of monolithic, homoepitaxial superlattices of high- and low-doped cadmium oxide (CdO). Further, the low losses offered by CdO enable the first demonstration of real-space imaging of hyperbolic plasmon polaritons in nanoresonators by scattering-type scanning near-field optical microscopy-previously only possible for hyperbolic phonon polariton materials. Tunable, low-loss CdO HMMs promise designability for applications such as on-chip photonics, super-resolution imaging (hyperlensing), enhanced emission, novel emitter designs, and possibly quantum nanophotonic and time variant metasurfaces.
Details
- Title: Subtitle
- Tunable, Homoepitaxial Hyperbolic Metamaterials Enabled by High Mobility CdO
- Creators
- Angela J. Cleri - Pennsylvania State UniversityJ. Ryan Nolen - Vanderbilt UniversityKonstantin G. Wirth - RWTH Aachen UniversityMingze He - Vanderbilt UniversityEvan L. Runnerstrom - United States ArmyKyle P. Kelley - Oak Ridge National LaboratoryJoshua Nordlander - Pennsylvania State UniversityThomas Taubner - RWTH Aachen UniversityThomas G. Folland - Vanderbilt UniversityJon-Paul Maria - Pennsylvania State UniversityJoshua D. Caldwell - Vanderbilt University
- Resource Type
- Journal article
- Publication Details
- Advanced optical materials, Vol.11(1), pp.2202137-n/a
- DOI
- 10.1002/adom.202202137
- ISSN
- 2195-1071
- eISSN
- 2195-1071
- Publisher
- Wiley
- Number of pages
- 9
- Grant note
- Department of Defense (DoD) through the National Defense Science and Engineering Graduate (NDSEG) Fellowship Program; United States Department of Defense N00014-22-12035; N00014-18-1-2107 / Office of Naval Research Grant; Office of Naval Research W911NF-21-1-0119; W911NF-16-1-0406 / Army Research Office Research TA848/7-1; SFB 917 / Deutsche Forschungsgemeinschaft (DFG); German Research Foundation (DFG)
- Language
- English
- Date published
- 01/01/2023
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428786402771
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