Computational upper-limit of directional light emission in nano-LED via inverse design
- Authors
- Chung, Haejun
- Issue Date
- Mar-2022
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v.30, no.6, pp.9008 - 9020
- Journal Title
- OPTICS EXPRESS
- Volume
- 30
- Number
- 6
- Start Page
- 9008
- End Page
- 9020
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42127
- DOI
- 10.1364/OE.451008
- ISSN
- 1094-4087
- Abstract
- We demonstrate directional light emission in nano-LEDs using inverse design. Standard light-extraction strategies in LEDs have been limited to surface roughening or suppressing guided modes via LED structure modifications, which are insufficient for simultaneously achieving high-light extraction efficiency and directional emission. In this work, we use inverse design to discover high-efficiency directional emitting nano-LEDs. We first investigate the computational upper bounds of directional emission using free-form grayscale material, where material permittivity indicates an intermediate state between air and SiO2. For a narrow emission angle (<+/- 30 degrees), the optimized grayscale design offers 4.99 times enhancement from the planar LED surface. Then, we apply fabrication constraints to our inverse design for discovering a single material (SiO2) based design. The optimized SiO2 surface design shows 4.71 times light extraction (<+/- 30 degrees) improvement compared with the planar configuration. This is a first theoretical demonstration of high light-extraction efficiency and directional emitting nano-LED designs. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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