Directive and coherent thermal emission of hybrid surface plasmon-phonon polaritons in n-GaN gratings of linear and radial shapes

Beaming and coherent thermal emission of the hybrid surface plasmon phonon polaritons (SPPhPs) was numerically and experimentally investigated employing the n-GaN surface relief gratings (SRGs) shaped in a linear and radial geometry. The polariton propagation losses were minimized numerically with t...

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Bibliographic Details
Published in:Optical materials express 2023-09, Vol.13 (9), p.2662
Main Authors: Janonis, Vytautas, Kacperski, Jacek, Selskis, Algirdas, Balagula, Roman M., Prystawko, Pawel, Kašalynas, Irmantas
Format: Article
Language:English
Subjects:
Mathematical models
Numerical models
Phonons
Plasmons
Polaritons
Thermal emission
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Summary:Beaming and coherent thermal emission of the hybrid surface plasmon phonon polaritons (SPPhPs) was numerically and experimentally investigated employing the n-GaN surface relief gratings (SRGs) shaped in a linear and radial geometry. The polariton propagation losses were minimized numerically with the help of a rigorous coupled wave analysis model, while the spatial and temporal quality of selected mode radiation in a normal direction was maximized by fixing the grating period value at 17.5 µm and varying the grating filling factor from 75% to 25%. A set of optimal design linear and radial geometry SRG samples were fabricated in order to validate the emission characteristics of hybrid SPPhPs found by numerical modeling. We demonstrated that both efficient emission and beaming are possible to achieve through the excitation and interference of the same number but opposite sign hybrid polariton modes in n-GaN SRG.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.494777