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Polarization-Dependent Sidewall Light Diffraction of LEDs Surrounded by Nanorod Arrays

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8 Author(s)
Kun-Mao Pan ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Yun-Wei Cheng ; Liang-Yi Chen ; Huang, Ying-Yuan
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The polarization behavior of the light-emitting diodes (LEDs) with nanorods surrounding the p-mesa is investigated. The nanorods were fabricated using a natural nanosphere lithography and are intended to diffract laterally propagated light. In the horizontal direction, s-polarized light is dominated since the injected carriers choose to fill up the lowest energy state in a direction parallel to the quantum-well layers. The p/s-polarized ratio starts to increase with the increase of radiated angles and eventually saturates. Since the Bragg diffraction of laterally propagated p-polarized mode by nanorods is more efficient than the s-polarized light, the p/s-ratio of the device with nanorods is higher than that without rods. The p/s-ratio of the LED with nanorods is 1.96 at 90deg, and is 1.52 when the integrating intensity between 0deg and 90deg is considered.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 22 )