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23 April 2019 High Q-factor controllable phononic modes in hybrid phononic–dielectric structures
Bo Qiang, Alexander M. Dubrovkin, Harish N. S. Krishnamoorthy, Qian Wang, Cesare Soci, Ying Zhang, Jinghua Teng, Qi Jie Wang
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Advanced Photonics, Vol. 1, Issue 2, 026001 (April 2019). https://doi.org/10.1117/1.AP.1.2.026001
Abstract
Phonon polariton resonances in the mid-infrared spectral range demonstrate properties superior to noble metal-based plasmonics, owing to smaller dissipative loss and better field confinement. However, a conventional way to excite the localized phonon resonance involves ion etching, which reduces the attainable quality factors (Q-factors) of the resonators. We show that by introducing a deep subwavelength layer of dielectric gratings on a phononic substrate, localized dipolar resonance and higher order modes with high Q-factors 96 and 195, respectively, can be excited. We further demonstrate, via experiments and simulations, that the resonant wavelength and field confinement can be controlled by coupling the localized hybrid mode with propagating surface phonon-polaritons. We also observed for the first time the coupling between a localized dipolar mode and a propagating higher-order surface phonon-polariton mode. The results will be useful in designing on-chip, low-loss, and highly integrated phononic devices in the infrared spectral domain.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Bo Qiang, Alexander M. Dubrovkin, Harish N. S. Krishnamoorthy, Qian Wang, Cesare Soci, Ying Zhang, Jinghua Teng, and Qi Jie Wang "High Q-factor controllable phononic modes in hybrid phononic–dielectric structures," Advanced Photonics 1(2), 026001 (23 April 2019). https://doi.org/10.1117/1.AP.1.2.026001
Received: 29 January 2019; Accepted: 1 April 2019; Published: 23 April 2019
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Cited by 14 scholarly publications.
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KEYWORDS
Silicon carbide
Absorption
Germanium
Phonons
Wave propagation
Mid-IR
Polaritons
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