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Proceedings Paper

Controlling LED radiation with dielectric metasurfaces (Conference Presentation)

Paper Abstract

We numerically and experimentally demonstrate that metasurfaces can be used to control the light emission from light emitting diodes (LED). This control provides a desired wavefront and functionality of the light emission in addition to enhancing light extraction efficiency. Simply placing the metasurface on top of the LED does not work as conventional metasurface designs require plane wave excitation, which LEDs cannot provide. To overcome this challenge we implement a novel concept using internal and external resonant cavities combined with the LED. Guided by our numerical simulations, we experimentally demonstrate this concept by fabricating Si and TiO2 metasurfaces on top of the resonant cavity LED structures. The integration of these metasurfaces with commercially available GaN and GaP LED devices show full wavefront control, beam deflection and beam collimation. Both the cavity and the metasurface enhance the LED radiation. Moreover, following the proposed principle, any random light emitting sources including fluorescent molecules and quantum dots can be integrated into a similar optical device to achieve focusing, beam deflecting, vortex beam generation and other capabilities.

Paper Details

Date Published: 8 March 2019
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Proc. SPIE 10928, High Contrast Metastructures VIII, 1092817 (8 March 2019); doi: 10.1117/12.2512037
Show Author Affiliations
Egor Khaidarov, Institute of Materials Research and Engineering (Singapore)
Zhengtong Liu, A*STAR Institute of High Performance Computing (Singapore)
Son Tung Ha, Institute of Materials Research and Engineering (Singapore)
Ramón Paniagua-Domínguez, Institute of Materials Research and Engineering (Singapore)
Vytautas Valuckas, Institute of Materials Research and Engineering (Singapore)
Yuriy Akimov, A*STAR Institute of High Performance Computing (Singapore)
Ping Bai, A*STAR Institute of High Performance Computing (Singapore)
Ching Eng Png, A*STAR Institute of High Performance Computing (Singapore)
Shunpeng Lu, Nanyang Technological Univ. (Singapore)
Swee Tiam Tan, Nanyang Technological Univ. (Singapore)
Hilmi Volkan Demir, Nanyang Technological Univ. (Singapore)
Arseniy I. Kuznetsov, Institute of Materials Research and Engineering (Singapore)


Published in SPIE Proceedings Vol. 10928:
High Contrast Metastructures VIII
Connie J. Chang-Hasnain; Andrei Faraon; Weimin Zhou, Editor(s)

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