High-frequency Sezawa guided mode of GaN/sapphire using high aspect ratio electrode

Muhammad Musoddiq Jaafar, M. F. Mohd Razip Wee, Chang Fu Dee, Mohd Syafiq Faiz, Edward Yi Chang, Burhanuddin Yeop Majlis

Research output: Contribution to journalArticle

Abstract

The propagation of surface acoustic wave (SAW) on the piezoelectric substrate requires conventionally an interdigitated electrode structure to excite the mechanical displacement at resonance frequency. The control of the electrode thickness could be useful to manipulate the energy confinement and the band dispersion of the surface guided mode. It has been demonstrated recently that high aspect ratio (HAR) electrode could produce a dispersive shear horizontal and vertically polarized surface modes in the bulk piezoelectric substrate. In this theoretical study, we propose to employ a high aspect ratio electrode on top of the GaN/sapphire-layered substrate enabling the presence of Sezawa surface mode. Based from the dispersion band, we obtained a higher frequency of surface guided mode in the non-radiative zone in the GaN/sapphire heterostructure configuration compared to the bulk GaN substrate. Indeed, these guided modes are induced by the hybridization between Sezawa surface mode and the mechanical resonance of the HAR electrode producing nearly a flat band at the limit of First Brillouin Zone. Furthermore, the displacement of each guided modes indicates the confinement of energy mostly in the electrode with a slight amount of energy in the top layer of the substrate. We demonstrated also the frequency tuning of guided mode using diverse materials for the electrode but also the thickness of GaN layer. The obtained results could be useful for the development of high-frequency telecommunication and sensing device based on Sezawa surface acoustic wave.

Original languageEnglish
Article number804
JournalApplied Physics A: Materials Science and Processing
Volume125
Issue number11
DOIs
Publication statusPublished - 1 Nov 2019

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Aluminum Oxide
Sapphire
Aspect ratio
Electrodes
Substrates
Surface waves
Acoustic waves
Telecommunication
Heterojunctions
Tuning

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

High-frequency Sezawa guided mode of GaN/sapphire using high aspect ratio electrode. / Jaafar, Muhammad Musoddiq; Mohd Razip Wee, M. F.; Dee, Chang Fu; Faiz, Mohd Syafiq; Chang, Edward Yi; Majlis, Burhanuddin Yeop.

In: Applied Physics A: Materials Science and Processing, Vol. 125, No. 11, 804, 01.11.2019.

Research output: Contribution to journalArticle

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