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Article

Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses

by
Hanlyun Cho
1,†,
Heonyeong Jeong
1,†,
Younghwan Yang
1,
Trevon Badloe
1 and
Junsuk Rho
1,2,3,*
1
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
2
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
3
POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang 37673, Korea
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Nanomaterials 2022, 12(1), 153; https://doi.org/10.3390/nano12010153
Submission received: 2 November 2021 / Revised: 15 December 2021 / Accepted: 16 December 2021 / Published: 1 January 2022
(This article belongs to the Special Issue Metalens: Applications and Manufacturing)
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Abstract

In this work, we present metalenses (MLs) designed to enhance the luminous intensity of incoherent light-emitting diodes (LEDs) within the detection angles of 0° and 10°. The detection angle of 0° refers to the center of the LED. Because the light emitted from LEDs is incoherent and expressed as a surface light source, they are numerically described as a set of point sources and calculated using incoherent summation. The titanium dioxide (TiO2) and amorphous silicon (a-Si) nanohole meta-atoms are designed; however, the full 2π phase coverage is not reached. Nevertheless, because the phase modulation at the edge of the ML is important, an ML is successfully designed. The typical phase profile of the ML enhances the luminous intensity at the center, and the phase profile is modified to increase the luminous intensity in the target detection angle region. Far field simulations are conducted to calculate the luminous intensity after 25 m of propagation. We demonstrate an enhancement of the luminous intensity at the center by 8551% and 2115% using TiO2 and a-Si MLs, respectively. Meanwhile, the TiO2 and a-Si MLs with the modified phase profiles enhance the luminous intensity within the detection angle of 10° by 263% and 30%, respectively.
Keywords: metalens; nanohole meta-atom; light-emitting diode; incoherent light source; surface light source; far field propagation metalens; nanohole meta-atom; light-emitting diode; incoherent light source; surface light source; far field propagation

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MDPI and ACS Style

Cho, H.; Jeong, H.; Yang, Y.; Badloe, T.; Rho, J. Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses. Nanomaterials 2022, 12, 153. https://doi.org/10.3390/nano12010153

AMA Style

Cho H, Jeong H, Yang Y, Badloe T, Rho J. Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses. Nanomaterials. 2022; 12(1):153. https://doi.org/10.3390/nano12010153

Chicago/Turabian Style

Cho, Hanlyun, Heonyeong Jeong, Younghwan Yang, Trevon Badloe, and Junsuk Rho. 2022. "Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses" Nanomaterials 12, no. 1: 153. https://doi.org/10.3390/nano12010153

APA Style

Cho, H., Jeong, H., Yang, Y., Badloe, T., & Rho, J. (2022). Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses. Nanomaterials, 12(1), 153. https://doi.org/10.3390/nano12010153

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