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Enhanced and partially polarized output of a light-emitting diode with its InGaN/GaN quantum well coupled with surface plasmons on a metal grating

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7 Author(s)
Shen, Kun-Ching ; Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan ; Chen, Cheng-Yen ; Hung-Lu Chen ; Chi-Feng Huang
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The enhanced and partially polarized output of a green light-emitting diode (LED), in which its InGaN/GaN quantum well (QW) couples with surface plasmons (SPs) on a surface Ag grating structure, is demonstrated. Compared with a LED sample without (flat) Ag coating, the total output intensity of an LED of SP-QW coupling can be enhanced by ∼59% (∼200)% when the grating period and groove depth are 500 and 30 nm, respectively. Also, a bottom-emission polarization ratio of 1.7 can be obtained under the condition of 15 nm in groove depth.

Published in:

Applied Physics Letters  (Volume:93 ,  Issue: 23 )

Date of Publication:

Dec 2008

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