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Volume 15
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10.3390/nano15030190
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Dual-Task Optimization Method for Inverse Design of RGB Micro-LED Light Collimator

by
Liming Chen
,
Zhuo Li
,
Purui Wang
,
Sihan Wu
,
Wen Li
,
Jiechen Wang
,
Yue Cao
,
Masood Mortazavi
,
Liang Peng
and
Pingfan Wu
*
Futurewei Technologies, 645 Martinsville Road, Basking Ridge, NJ 07920, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2025, 15(3), 190; https://doi.org/10.3390/nano15030190
Submission received: 10 December 2024 / Revised: 10 January 2025 / Accepted: 23 January 2025 / Published: 25 January 2025
(This article belongs to the Special Issue Nano-Photonics: Subwavelength Optical Elements, Metasurfaces, Plasmonics and Quantum Photonics: 2nd Edition)
Review Reports Versions Notes

Abstract

Abstract: Miniaturized pixel sizes in near-eye digital displays lead to pixel emission patterns with large divergence angles, necessitating efficient beam collimation solutions to improve the light coupling efficiency. Traditional beam collimation optics, such as lenses and cavities, are wavelength-sensitive and cannot simultaneously collimate red (R), green (G), and blue (B) light. In this work, we employed inverse design optimization and finite-difference time-domain (FDTD) simulation techniques to design a collimator comprised of nano-sized photonic structures. To alleviate the challenges of the spatial incoherence nature of micro-LED emission light, we developed a strategy called dual-task optimization. Specifically, the method models light collimation as a dual task of color routing. By optimizing a color router, which routes incident light within a small angular range to different locations based on its spectrum, we simultaneously obtained a beam collimator, which can restrict the output of the light emitted from the routing destination with a small divergence angle. We further evaluated the collimation performance for spatially incoherent RGB micro-LED light in an FDTD using a multiple-dipole simulation method, and the simulation results demonstrate that our designed collimator can increase the light coupling efficiency from approximately 30% to 60% within a divergence angle of ±20° for all R/G/B light under the spatially incoherent emission.
Keywords: dual-task optimization; inverse design; micro-LED; incoherent light collimator; FDTD; light coupling efficiency dual-task optimization; inverse design; micro-LED; incoherent light collimator; FDTD; light coupling efficiency

Share and Cite

MDPI and ACS Style

Chen, L.; Li, Z.; Wang, P.; Wu, S.; Li, W.; Wang, J.; Cao, Y.; Mortazavi, M.; Peng, L.; Wu, P. Dual-Task Optimization Method for Inverse Design of RGB Micro-LED Light Collimator. Nanomaterials 2025, 15, 190. https://doi.org/10.3390/nano15030190

AMA Style

Chen L, Li Z, Wang P, Wu S, Li W, Wang J, Cao Y, Mortazavi M, Peng L, Wu P. Dual-Task Optimization Method for Inverse Design of RGB Micro-LED Light Collimator. Nanomaterials. 2025; 15(3):190. https://doi.org/10.3390/nano15030190

Chicago/Turabian Style

Chen, Liming, Zhuo Li, Purui Wang, Sihan Wu, Wen Li, Jiechen Wang, Yue Cao, Masood Mortazavi, Liang Peng, and Pingfan Wu. 2025. "Dual-Task Optimization Method for Inverse Design of RGB Micro-LED Light Collimator" Nanomaterials 15, no. 3: 190. https://doi.org/10.3390/nano15030190

APA Style

Chen, L., Li, Z., Wang, P., Wu, S., Li, W., Wang, J., Cao, Y., Mortazavi, M., Peng, L., & Wu, P. (2025). Dual-Task Optimization Method for Inverse Design of RGB Micro-LED Light Collimator. Nanomaterials, 15(3), 190. https://doi.org/10.3390/nano15030190

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