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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2505.23687 |
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| _version_ | 1866908384337330176 |
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| author | Xu, Hanbo Liu, Xinyang Wang, Lei |
| author_facet | Xu, Hanbo Liu, Xinyang Wang, Lei |
| contents | This study presents an optimized hybrid design integrating a distributed Bragg reflector (DBR) and a TiO2 nanocylinder metasurface to enhance light extraction efficiency (LEE) and beam directionality(narrow divergence angle) in light-emitting diodes (LEDs) based on gallium nitride (GaN).Parametric simulations were used to identify an optimal device architecture.The resulting structure comprises a single-period DBR,which has a thickness of TiO2(dTiO2) equal to forty-six nm and a thickness of SiO2 equal to seventy-sevsen nm,beneath a periodic array of TiO2 nanocylinders (radius is approximately seventy-one nm,height is approximately one handred and eighty-five nm).The DBR reflects guided modes to minimize internal optical losses,while the TiO2 metasurface employs Mie resonance to collimate the emitted light.As a result,the hybrid LED achieves a simulated LEE of 25.67 percent and a beam divergence angle of only 5.7 degree,representing a significant improvement in both efficiency and emission directionality over conventional designs.These findings demonstrate a viable strategy to overcome light trapping and broad angular emission in GaN LEDs,paving the way for high-brightness,highly directional GaN micro-LEDs for advanced display and optical communication applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_23687 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhanced Light Extraction and Beam Focusing in GaN LEDs Using Hybrid Metasurface-Distributed Bragg Reflector Structures Xu, Hanbo Liu, Xinyang Wang, Lei Optics Applied Physics This study presents an optimized hybrid design integrating a distributed Bragg reflector (DBR) and a TiO2 nanocylinder metasurface to enhance light extraction efficiency (LEE) and beam directionality(narrow divergence angle) in light-emitting diodes (LEDs) based on gallium nitride (GaN).Parametric simulations were used to identify an optimal device architecture.The resulting structure comprises a single-period DBR,which has a thickness of TiO2(dTiO2) equal to forty-six nm and a thickness of SiO2 equal to seventy-sevsen nm,beneath a periodic array of TiO2 nanocylinders (radius is approximately seventy-one nm,height is approximately one handred and eighty-five nm).The DBR reflects guided modes to minimize internal optical losses,while the TiO2 metasurface employs Mie resonance to collimate the emitted light.As a result,the hybrid LED achieves a simulated LEE of 25.67 percent and a beam divergence angle of only 5.7 degree,representing a significant improvement in both efficiency and emission directionality over conventional designs.These findings demonstrate a viable strategy to overcome light trapping and broad angular emission in GaN LEDs,paving the way for high-brightness,highly directional GaN micro-LEDs for advanced display and optical communication applications. |
| title | Enhanced Light Extraction and Beam Focusing in GaN LEDs Using Hybrid Metasurface-Distributed Bragg Reflector Structures |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2505.23687 |