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17 September 2018 Ultra low-loss polaritons in hexagonal boron nitride (Conference Presentation)
Alexander J. Giles, Igor Vurgaftman, Siyuan Dai, Timothy Hoffman, Song Liu, Lucas Lindsay, Chase Ellis, Nathaniel Assefa, Ioannis Chatzakis, Thomas Reinecke, Joseph Tischler, Michael Fogler, James Edgar, Dmitri Basov, Joshua Caldwell
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Proceedings Volume 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI; 1072214 (2018) https://doi.org/10.1117/12.2322058
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States
Abstract
Conventional optical components are limited to size-scales much larger than the wavelength of light, as changes to the amplitude, phase and polarization of the electromagnetic fields are accrued gradually along an optical path. However, advances in nanophotonics have produced ultrathin, so-called “flat” optical components that beget abrupt changes in these properties over distances significantly shorter than the free space wavelength. While high optical losses still plague many approaches, phonon polariton materials have demonstrated long lifetimes for localized modes in comparison to plasmon-polariton based nanophotonics. Our work predicts a further 14-fold increase in the optic phonon lifetime and we experimentally report a ~3-fold improvement through isotopic enrichment of hexagonal boron nitride (hBN). We establish commensurate increases in the phonon polariton propagation length via direct imaging of polaritonic standing waves by means of infrared nano-optics. Our results provide the foundation for a materials-growth-directed approach towards realizing the loss control necessary for the development of phonon polariton based nanophotonic devices.
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Alexander J. Giles, Igor Vurgaftman, Siyuan Dai, Timothy Hoffman, Song Liu, Lucas Lindsay, Chase Ellis, Nathaniel Assefa, Ioannis Chatzakis, Thomas Reinecke, Joseph Tischler, Michael Fogler, James Edgar, Dmitri Basov, and Joshua Caldwell "Ultra low-loss polaritons in hexagonal boron nitride (Conference Presentation)", Proc. SPIE 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI, 1072214 (17 September 2018); https://doi.org/10.1117/12.2322058
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KEYWORDS
Polaritons
Boron
Phonons
Free space optics
Nanophotonics
Optical components
Electromagnetism
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