GaN Membrane With Nano-Grooves for Single-Band Coupling in the Entire Visible Wavelength Range

Nano-groove arrays incorporated into a freestanding GaN membrane are proposed for coupling with visible light. The coupling of transverse electric mode light over the entire visible wavelength region into and out of the planar membrane is thoroughly investigated herein by performing a finite element...

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Bibliographic Details
Published in:IEEE photonics journal 2018-04, Vol.10 (2), p.1-12
Main Authors: Liu, Qifa, Wang, Cheng, Yang, Wenlei, Wang, Huihui, Xu, Rongqing
Format: Article
Language:English
Subjects:
Couplings
Detectors
FEM
Finite element analysis
Gallium nitride
GaN membrane
Gratings
nano-grooves
Optical waveguides
Photonics
single-band tunable coupling
visible wavelength
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Summary:Nano-groove arrays incorporated into a freestanding GaN membrane are proposed for coupling with visible light. The coupling of transverse electric mode light over the entire visible wavelength region into and out of the planar membrane is thoroughly investigated herein by performing a finite element method analysis. Coupling can be regulated by device parameters such as groove depth, membrane thickness, grating period, and duty cycle. Single-band coupling featuring tunable coupling bands can be realized, with the peak dual coupling efficiency reaching 0.55. This study paves the way for realizing planar photonics devices at specific single wavelengths. The proposed device is a suitable candidate for use in optical filters, de-multiplexers, planar photonic sensors, and other devices.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2018.2815016