A theoretical study of surface mode propagation with a guiding layer of GaN/sapphire hetero-structure in liquid medium

Mohd Farhanulhakim Mohd Razip Wee, Muhammad Musoddiq Jaafar, Mohd Syafiq Faiz, Chang Fu Dee, Burhanuddin Yeop Majlis

Research output: Contribution to journalArticle

Abstract

Gallium Nitride (GaN) is considered as the second most popular semiconductor material in industry after silicon. This is due to its wide applications encompassing Light Emitting Diode (LED) and power electronics. In addition, its piezoelectric properties are fascinating to be explored as electromechanical material for the development of diverse microelectromechanical systems (MEMS) application. In this article, we conducted a theoretical study concerning surface mode propagation, especially Rayleigh and Sezawa mode in the layered GaN/sapphire structure with the presence of various guiding layers. It is demonstrated that the increase in thickness of guiding layer will decrease the phase velocities of surface mode depending on the material properties of the layer. In addition, the Q-factor value indicating the resonance properties of surface mode appeared to be affected with the presence of fluid domain, particularly in the Rayleigh mode. Meanwhile, the peak for Sezawa mode shows the highest Q factor and is not altered by the presence of fluid. Based on these theoretical results using the finite element method, it could contribute to the development of a GaN-based device to generate surface acoustic wave, especially in Sezawa mode which could be useful in acoustophoresis, lab on-chip and microfluidics applications.

Original languageEnglish
Article number124
JournalBiosensors
Volume8
Issue number4
DOIs
Publication statusPublished - 5 Dec 2018

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Aluminum Oxide
Theoretical Models
Liquids
Semiconductors
Fluids
Microfluidics
Surface Properties
Phase velocity
Silicon
Power electronics
Surface waves
MEMS
Light emitting diodes
Materials properties
Industry
Acoustic waves
Semiconductor materials
Finite element method
Light
Equipment and Supplies

Keywords

  • Biosensor
  • Gallium Nitride
  • Microfluidic
  • Sezawa wave
  • Surface acoustic wave

ASJC Scopus subject areas

  • Clinical Biochemistry

Cite this

A theoretical study of surface mode propagation with a guiding layer of GaN/sapphire hetero-structure in liquid medium. / Mohd Razip Wee, Mohd Farhanulhakim; Jaafar, Muhammad Musoddiq; Faiz, Mohd Syafiq; Dee, Chang Fu; Yeop Majlis, Burhanuddin.

In: Biosensors, Vol. 8, No. 4, 124, 05.12.2018.

Research output: Contribution to journalArticle

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