Journal article
Engineering the Spectral and Spatial Dispersion of Thermal Emission via Polariton-Phonon Strong Coupling
Nano letters, Vol.21(4), pp.1831-1838
02/24/2021
DOI: 10.1021/acs.nanolett.0c04767
PMID: 33587855
Abstract
Strong coupling between optical modes can be implemented into nanophotonic design to modify the energy- momentum dispersion relation. This approach offers potential avenues for tuning the thermal emission frequency, line width, polarization, and spatial coherence. Here, we employ three-mode strong coupling between propagating and localized surface phonon polaritons, with zone-folded longitudinal optic phonons within periodic arrays of 4H-SiC nanopillars. Energy exchange, mode evolution, and coupling strength between the three polariton branches are explored experimentally and theoretically. The influence of strong coupling upon the angle-dependent thermal emission was directly measured, providing excellent agreement with theory. We demonstrate a 5-fold improvement in the spatial coherence and 3-fold enhancement of the quality factor of the polaritonic modes, with these hybrid modes also exhibiting a mixed character that could enable opportunities to realize electrically driven emission. Our results show that polariton-phonon strong coupling enables thermal emitters, which meet the requirements for a host of IR applications in a simple, lightweight, narrow-band, and yet bright emitter.
Details
- Title: Subtitle
- Engineering the Spectral and Spatial Dispersion of Thermal Emission via Polariton-Phonon Strong Coupling
- Creators
- Guanyu Lu - Vanderbilt UniversityChristopher R. Gubbin - University of SouthamptonJ. Ryan Nolen - Vanderbilt UniversityThomas Folland - Vanderbilt UniversityMarko J. Tadjer - United States Naval Research LaboratorySimone De Liberato - University of SouthamptonJoshua D. Caldwell - Vanderbilt University
- Resource Type
- Journal article
- Publication Details
- Nano letters, Vol.21(4), pp.1831-1838
- Publisher
- Amer Chemical Soc
- DOI
- 10.1021/acs.nanolett.0c04767
- PMID
- 33587855
- ISSN
- 1530-6984
- eISSN
- 1530-6992
- Number of pages
- 8
- Grant note
- N00014-18-12107 / Office of Naval Research RGF\EA\181001 / Royal Society Vanderbilt School of Engineering Office of Naval Research Royal Society Research fellowship; Royal Society Vanderbilt University
- Language
- English
- Date published
- 02/24/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429030802771
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