Ronghui Lin, Sergio Valdes Galan, Haiding Sun, Yangrui Hu, Mohd Sharizal Alias, Bilal Janjua, Tien Khee Ng, Boon S. Ooi, Xiaohang Li. Tapering-induced enhancement of light extraction efficiency of nanowire deep ultraviolet LED by theoretical simulations[J]. Photonics Research, 2018, 6(5): 457
- Photonics Research
- Vol. 6, Issue 5, 457 (2018)
![(a) Simulated NW DUV-LED structure. (b) 3D schematic of the NW array composed of a hexagonal periodic structure of 121 NWs. (c) RI of GaN, AlGaN, and silicon substrate. (d) Cross-sectional scanning electron microscope image of MBE-grown NWs [22].](/richHtml/prj/2018/6/5/05000457/img_001.jpg)
Fig. 1. (a) Simulated NW DUV-LED structure. (b) 3D schematic of the NW array composed of a hexagonal periodic structure of 121 NWs. (c) RI of GaN, AlGaN, and silicon substrate. (d) Cross-sectional scanning electron microscope image of MBE-grown NWs [22].
Fig. 2. Comparison of the band structures of NW arrays with θ = 0 °
Fig. 3. LEE versus tapering angle θ
Fig. 4. Electric field intensity distribution for (a) cross-sectional view and (b) top view for TE and TM modes in a conventional cylindrical structure (θ = 0 ° θ = 5.25 °
Fig. 5. Far-field intensity distribution of (a) TE polarization mode and (b) TM polarization mode for θ = 0 °
Fig. 6. Comparison of Bloch mode profiles of NW array with the tapering angles of 0° and 5.25°.
Fig. 7. Influence of the positional error on the LEE of (a) 5.25° tapering angle TE polarized emission, (b) 5.25° tapering angle TM polarized emission, (c) 0° tapering angle TE polarized emission, and (d) 0° tapering angle TM polarized emission.
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