Suspended membrane GaN gratings for refractive index sensing

Yongjin Wang*, Jiajia Chen, Zheng Shi, Shumin He, Martin Lopez Garcia, Lifeng Chen, Nikolai A. Hueting, Martin Cryan, Miao Zhang, Hongbo Zhu

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)


In this paper, we describe the fabrication and the novel procedure for back thinning the GaN layer, which leads to improved optical performance. Angular-resolved reflectance measurements are then conducted to characterize the GaN gratings and show the dependence of resonant wavelength on grating period and membrane thickness. The measured results compare well with electromagnetic modeling based on rigorous coupled wave analysis (RCWA). Altering the dielectric environment has been shown as a novel sensing mechanism, and this work opens the way to the fabrication of novel GaN resonant photonic devices for refractive index sensing applications in the visible wavelength range. (C) 2014 The Japan Society of Applied Physics

Original languageEnglish
Article number052201
Number of pages4
JournalApplied Physics Express
Issue number5
Publication statusPublished - May 2014

Structured keywords

  • Photonics and Quantum


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