DataVXAdvanced Optical MaterialsPaper
journal article·2021-01

Focus‐Tunable Planar Lenses by Controlled Carriers over Exciton

Sehong Park, Chaebin Park, Yun Ji Hwang, Jeongseob Kang, Gilho Lee, Youngho Seo, Young Tea Chun, Junsuk Rho, Jong Min Kim, James Hone, Seong Chan Jun

Advanced Optical Materials· Volume 9· Issue 2
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Source abstract

Abstract

Abstract While recent studies on nanoscale diffractive lenses demonstrate their potential as possible candidates for thin‐film display applications, their narrow focal ranges limit their application. Graphene, however, may realize focal controllability for its unique optoelectric property; due to its unique band structure among 2D materials, its carriers can be controlled by adjusting the Fermi level. Furthermore, due to the bandgap property of graphene, the intraband excitation of carriers is dominant over the interband excitation of carriers, which results in enhanced photonic transmission and reduced absorbance. Utilizing this property, graphene‐based ultrathin focusing device is fabricated that alters its optical characteristics when direct‐current voltage is applied producing vertical fringe‐specific electric field. The proposed device demonstrates 8.6% change in focal length and 48.85% focusing efficiency at wavelength of 405 nm. Overall, this study on electrically tunable ultrathin microlens introduces potential for holographic displays and expands the research scope in future display technologies.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Metamaterials and Metasurfaces Applications · Plasmonic and Surface Plasmon Research · Photonic Crystals and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Mechanical Engineering Yonsei University 50 Yonsei‐ro, Seodaemun‐gu Seoul 03722 Republic of Korea

Electrical Engineering Division Engineering Department University of Cambridge 9, JJ Thomson Avenue Cambridge CB3 OFA UK

Department of Electronic Material Engineering Korea Maritime and Ocean University Busan 49112 Republic of Korea

Department of Mechanical Engineering Pohang University of Science and Technology (POSTECH) 77 Chungam‐ro, Nam‐gu Pohang 37673 Republic of Korea

Department of Chemical Engineering Pohang University of Science and Technology (POSTECH) 77 Cheongam‐ro, Nam‐gu Pohang 37673 Republic of Korea

Institute for Convergence Research and Education in Advanced Technology Yonsei University 50 Yonsei‐ro, Seodaemun‐gu Seoul 03722 Republic of Korea

Department of Mechanical Engineering Columbia University 500 West 120th Street, Mudd 220 New York NY 10027 USA

Funding

National Research Foundation of Korea · Ministry of Science, ICT and Future Planning

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