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Sezawa Guided Mode on Periodic Grooves of GaN/sapphire substrate
Muhammad Musoddiq Jaafar,M. F. Mohd Razip Wee,Chang Fu Dee,Edward Yi Chang,Burhanuddin Yeop Majlis 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.4
Gallium nitride could exhibit strong piezoelectric properties which could be further developed for high frequency devices,telecommunication applications, and many more. In this study, we explored theoretically and experimentally the potentialSezawa guided mode in the groove structure along the GaN/Sapphire interface. Computational analysis with Finite ElementMethod demonstrates the presence three peaks of particular modes at specifics resonance frequencies and interestingly withhigh energy confinement inside the GaN. The experimental data of insertion loss peak graph extrapolated from s-parametermeasurement showed that the results of frequency response are correspond to three peaks of the particular modes hencevalidate the computational results. This finding is attributed to the locally resonant mechanism that confines the energy in theperiodic structure that prevents radiation of energy. This particular propagation can be exploited to enable the developmentof Sezawa-GaN platform to be operational in the liquid medium, for sensor and actuator applications.