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Title: Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses
Authors: Wang, Hongtao 
Hao, Chenglong 
Lin, Han
Wang, Yongtian
Lan, Tian
Qiu, Chengwei 
Jia, Baohua
Keywords: Femtosecond laser reduction
Graphene oxide
Multifocal spots
Optical needle
Issue Date: 1-Jan-2021
Publisher: Chinese Academy of Sciences
Citation: Wang, Hongtao, Hao, Chenglong, Lin, Han, Wang, Yongtian, Lan, Tian, Qiu, Chengwei, Jia, Baohua (2021-01-01). Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses. Opto-Electronic Advances 4 (2) : 1-Nov. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses, offering new possibilities for myriads of miniaturization and interfacial applications. Graphene-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like materials. In this work, we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material system. We experimentally validate our strategies via demonstrations of two graphene oxide metalenses: one with an ultra-long (~16?) optical needle, and the other with axial multifocal spots, at the wavelength of 632.8 nm with a 200 nm thin film. Our proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications. © 2021 Institute of Optics and Electronics, Chinese Academy of Sciences. All rights reserved.
Source Title: Opto-Electronic Advances
ISSN: 2096-4579
DOI: 10.29026/oea.2021.200031
Rights: Attribution 4.0 International
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