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  • Received: Jun. 21, 2020

    Accepted: Sep. 8, 2020

    Posted: Oct. 9, 2020

    Published Online: Oct. 9, 2020

    The Author Email: Lin Han (hanlin@swin.edu.au), Fraser Scott (scottfraser@swin.edu.au), Hong Minghui (elehmh@nus.edu.sg), Chhowalla Manish (manish1@soe.rutgers.edu), Li Dan (dan.li1@unimelb.edu.au), Jia Baohua (bjia@swin.edu.au)

    DOI: 10.1117/1.AP.2.5.055001

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    Han Lin, Scott Fraser, Minghui Hong, Manish Chhowalla, Dan Li, Baohua Jia. Near-perfect microlenses based on graphene microbubbles[J]. Advanced Photonics, 2020, 2(5): 055001

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Advanced Photonics, Vol. 2, Issue 5, 055001 (2020)

Near-perfect microlenses based on graphene microbubbles

Han Lin1,*, Scott Fraser1, Minghui Hong2, Manish Chhowalla3, Dan Li4,5, and Baohua Jia1,*

Author Affiliations

  • 1Swinburne University of Technology, Centre for Microphotonics, Faculty of Science, Engineering, and Technology, Hawthorn, Australia
  • 2National University of Singapore, Department of Electrical and Computer Engineering, Singapore
  • 3Rutgers University, Department of Materials Science and Engineering, Piscataway, New Jersey, United States
  • 4University of Melbourne, Department of Chemical Engineering, Melbourne, Australia
  • 5Monash University, Monash Centre for Atomically Thin Materials, Department of Materials Science and Engineering, Clayton, Australia

Abstract

Microbubbles acting as lenses are interesting for optical and photonic applications such as volumetric displays, optical resonators, integration of photonic components onto chips, high-resolution spectroscopy, lithography, and imaging. However, stable, rationally designed, and uniform microbubbles on substrates such as silicon chips are challenging because of the random nature of microbubble formation. We describe the fabrication of elastic microbubbles with a precise control of volume and curvature based on femtosecond laser irradiated graphene oxide. We demonstrate that the graphene microbubbles possess a near-perfect curvature that allows them to function as reflective microlenses for focusing broadband white light into an ultrahigh aspect ratio diffraction-limited photonic jet without chromatic aberration. Our results provide a pathway for integration of graphene microbubbles as lenses for nanophotonic components for miniaturized lab-on-a-chip devices along with applications in high-resolution spectroscopy and imaging.

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