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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 16 — Aug. 15, 2014
  • pp: 4931–4933

Experimental observation of lateral emission in freestanding GaN-based membrane devices

Zheng Shi, Xin Li, Xiaojing Fang, Xiaoming Huang, Hongbo Zhu, and Yongjin Wang  »View Author Affiliations

Optics Letters, Vol. 39, Issue 16, pp. 4931-4933 (2014)

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This Letter describes a double-sided process to fabricate freestanding membrane devices on a GaN-on-silicon platform. The photoluminescence measurement is taken to characterize the optical performance. A large portion of the excited light from InGaN/GaN multiple quantum wells is trapped as waveguide modes and propagates in different directions. Experimental results show that the propagation direction of the waveguide mode can be converted into the direction normal to the surface at the edge of a freestanding membrane, and the emitted light is attenuated due to light propagation loss before it gets out from the edge. Subwavelength grating can also convert waveguide modes into air modes on a freestanding membrane. These results suggest that the emission efficiency can be greatly improved by employing more efficient light extraction methods and that GaN-based photonic waveguides are promising in the visible range.

© 2014 Optical Society of America

OCIS Codes
(220.4241) Optical design and fabrication : Nanostructure fabrication
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:

Original Manuscript: May 7, 2014
Revised Manuscript: July 17, 2014
Manuscript Accepted: July 20, 2014
Published: August 15, 2014

Zheng Shi, Xin Li, Xiaojing Fang, Xiaoming Huang, Hongbo Zhu, and Yongjin Wang, "Experimental observation of lateral emission in freestanding GaN-based membrane devices," Opt. Lett. 39, 4931-4933 (2014)

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