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Title: High Q-factor controllable phononic modes in hybrid phononic–dielectric structures
Authors: Qiang, Bo
Dubrovkin, Alexander M.
Krishnamoorthy, Harish N. S.
Wang, Qian
Soci, Cesare
Zhang, Ying
Teng, Jinghua
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Issue Date: 2019
Source: Qiang, B., Dubrovkin, A. M., Krishnamoorthy, H. N. S., Wang, Q., Soci, C., Zhang, Y., Teng, J. & Wang, Q. J. (2019). High Q-factor controllable phononic modes in hybrid phononic–dielectric structures. Advanced Photonics, 1(2), 026001-.
Project: MOE2016-T2-2-159
MOE Tier 1 RG164/15
NSFC (No. 61704082)
MOE2016-T3-1-006 (S)
Journal: Advanced Photonics
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.
ISSN: 026001 (2019)
DOI: 10.1117/1.AP.1.2.026001
Schools: School of Materials Science and Engineering 
Organisations: Singapore Institute of Manufacturing Technology, A*STAR
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Centre for OptoElectronics and Biophotonics (OPTIMUS) 
A*STAR Institute of Material Research and Engineering 
Rights: © 2019 The Authors. Published by SPIE and CLP 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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