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Ultrafast direct laser writing of 2D materials for multifunctional photonics devices [Invited]

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Chinese Optics Letters 2020年第2期18卷 80-85页

作者：杨铁山林瀚贾宝华 Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVictoria 3122Australia

Recently,fundamental properties and practical applications of two-dimensional(2D)materials have attracted tremendous ***/nanostructures and functional devices in 2D materials have been fabricated by various *** direct laser writing(DLW)with the advantages of rich light-matter interactions;unique three-dimensional processing capability;arbitrary-shape design flexibility;and minimized thermal effect,which enables high fabrication accuracy resolution,has been widely applied in the fabrication of 2D materials for multifunctional *** timely review summarizes the laser interactions with 2D materials and the advances in diverse functional photonics devices by *** perspectives and challenges in designing and improving laser-fabricated 2D material photonic devices are also discussed.

关键词： 2D materials direct laser writing photonics devices

Diffraction-Limited Imaging with a Graphene Metalens

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Chinese Physics Letters 2020年第10期37卷 54-60页

作者：李雪岩林瀚赵跃进贾宝华 Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Centre for Translational Atomaterials Swinburne University of Technology.P.O.Box 218HawthornVIC 3122Australia The Australian Research Council(ARC)industrial transformation training Centre in Surface Engineering for Advanced Materials(SEAM) Swinburne University of TechnologyP.O.Box 218HawthornVIC 3122Australia

Planar graphene metalens has demonstrated advantages of ultrathin thickness(200 nm),high focusing resolution(343 nm)and efficiency(>32%)and robust mechanical strength and ***,diffraction-limited imaging with such a graphene metalens has not been realized,which holds the key to designing practical integrated imaging *** this work,the imaging rule for graphene metalenses is first derived and theoretically verified by using the Rayleigh-Sommerfeld diffraction theory to simulate the imaging performance of the 200 nm ultrathin graphene *** imaging rule is applicable to graphene metalenses in different immersion media,including water or *** on the theoretical prediction,high-resolution imaging using the graphene metalens with diffraction-limited resolution(500 nm)is demonstrated for the first *** work opens the possibility for graphene metalenses to be applied in particle tracking,microfluidic chips and biomedical devices.

关键词： resolution holds rule

Giant and light modifiable third-order optical nonlinearity in a free-standing h-BN film

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Opto-Electronic Science 2022年第6期1卷 1-10页

作者： Jun Ren Han Lin Xiaorui Zheng Weiwei Lei Dan Liu Tianling Ren Pu Wang Baohua Jia Centre for Translational Atomaterials School of ScienceComputing and Engineering TechnologiesSwinburne University of TechnologyP.O.Box 218HawthornVictoria 3122Australia School of Integrated circuits Tsinghua UniversityHaidianBeijing 100084China Institute for Frontier Materials Deakin UniversityGeelongVictoria 3216Australia Institute of Laser Engineering Beijing University of TechnologyChaoyangBeijing 100124China The Australian Research Council(ARC)industrial transformation training Centre in Surface Engineering for Advanced Materials(SEAM)Swinburne University of TechnologyHawthornVictoria 3122Australia School of Science RMIT UniversityMelbourneVictoria 3000Australia

Recently,hexagonal boron nitride(h-BN)has become a promising nanophotonic platform for on-chip information devices due to the practicability in generating optically stable,ultra-bright quantum *** an integrated information-processing chip,high optical nonlinearity is indispensable for various fundamental functionalities,such as all-optical modulation,high order harmonic generation,optical switching and so *** we study the third-order optical nonlinearity of free-standing h-BN thin films,which is an ideal platform for on-chip integration and device formation without the need of *** films were synthesized by a solution-based method with abundant functional groups enabling high third-order optical *** the highly inert pristine h-BN films synthesized by conventional methods,the free-standing h-BN films could be locally oxidized upon tailored femtosecond laser irradiation,which further enhances the third-order nonlinearity,especially the nonlinear refraction index,by more than 20 *** combination of the free-standing h-BN films with laser activation and patterning capability establishes a new promising platform for high performance on-chip photonic devices with modifiable optical performance.

关键词： hexagonal boron nitride third-order nonlinearity laser oxidation optoelectronic device

Theoretical investigation of CoTa2O6/graphene heterojunctions for oxygen evolution reaction

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Frontiers of Physics 2021年第1期16卷 148-154页

作者： Qinye Li Siyao Qiu Baohua Jia Centre for Translational Atomaterials Faculty of Science Engineering and Technology Swinburne University of Technology The Australian Research Council (ARC) industrial transformation training Centre in Surface Engineering for Advanced Materials (SEAM) Swinburne University of Technology College of Chemical Engineering and Energy Technology Dongguan University of Technology

Water electrolysis is to split water into hydrogen and oxygen using electricity as the driving *** obtain low-cost hydrogen in a large scale, it is critical to develop electrocatalysts based on earth abundant elements with a high efficiency. This computational work started with Cobalt on CoTa2O6surface as the active site, CoTa2O6/Graphene heterojunctions have been explored as potential oxygen evolution reaction（OER） catalysts through density functional theory（DFT）. We demonstrated that the electron transfer（δ） from CoTa2O6to graphene substrate can be utilized to boost the reactivity of Co-site, leading to an OER overpotential as low as 0.30 V when N-doped graphene is employed. Our findings offer novel design of heterojunctions as high performance OER catalysts.

关键词： CoTa2O6 OER charge transfer DFT heterojunctions

Diffraction-limited imaging with monolayer 2D material-based ultrathin flat lenses

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Light(Science & Applications) 2020年第1期9卷 696-706页

作者： Han Lin Zai-Quan Xu Guiyuan Cao Yupeng Zhang Jiadong Zhou Ziyu Wang Zhichen Wan Zheng Liu Kian Ping Loh Cheng-Wei Qiu Qiaoliang Bao Baohua Jia Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyP.O.Box 218HawthornVIC 3122Australia Department of Materials Science and Engineering ARC Centre of Excellence in Future Low-Energy Electronics Technologies(FLEET)Monash UniversityWellington RoadClaytonVIC 3800Australia School of Mathematical and Physical Sciences Faculty of ScienceUniversity of Technology Sydney15 BroadwayUltimoNSW 2007Australia Institute of Microscale Optoelectronics Lab of Artificial Microstructure for OptoelectronicsShenzhen University518000 ShenzhenChina School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Chemistry National University of SingaporeSingapore 117543Singapore Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore The Australian Research Council(ARC)industrial transformation training Centre in Surface Engineering for Advanced Materials(SEAM) Swinburne University of TechnologyP.O.Box 218HawthornVIC 3122Australia

Ultrathin flat optics allow control of light at the subwavelength scale that is unmatched by traditional refractive *** approach the atomically thin limit,the use of 2D materials is an attractive possibility due to their high refractive ***,achievement of diffraction-limited focusing and imaging is challenged by their thickness-limited spatial resolution and focusing *** we report a universal method to transform 2D monolayers into ultrathin flat *** laser direct writing was applied to generate local scattering media inside a monolayer,which overcomes the longstanding challenge of obtaining sufficient phase or amplitude modulation in atomically thin 2D *** achieved highly efficient 3D focusing with subwavelength resolution and diffractionlimited *** high focusing performance even allows diffraction-limited imaging at different focal positions with varying *** work paves the way for downscaling of optical devices using 2D materials and reports an unprecedented approach for fabricating ultrathin imaging devices.

关键词： ultrathin scattering optics

Theoretical investigation of CoTa_(2)0_(6)/graphene heterojunctions for oxygen evolution reaction

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Frontiers of physics 2021年第1期16卷 31-37页

作者： Qinye Li Siyao Qiu Baohua Jia Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVictoria 3122Australia The Australian Research Council(ARC)industrial transformation training Centre in Surface Engineering for Advanced Materials(SEAM) Swinburne University of TechnologyHawthornVictoria 3122Australia College of Chemical Engineering and Energy Technology Dongguan University of TechnologyDongguan 523808China

Water electrolysis is to split water into hydrogen and oxygen using electricity as the driving *** obtain low-cost hydrogen in a large scale,it is critical to develop electrocatalysts based on earth abundant elements with a high *** computational work started with Cobalt on CoTh_(2)C)_(6)surface as the active site,CoTa_(2)O_(6)/Graphene heterojunctions have been explored as potential oxygen evolution reaction(OER)catalysts through density functional theory(DFT).We demonstrated that the electron transfer(_(6))from CoTa_(2)C)_(6)to graphene substrate can be utilized to boost the reactivity of Co-site,leading to an OER overpotential as low as 0.30 V when N-doped graphene is *** findings offer novel design of heterojunctions as high performance OER catalysts.

关键词： CoTa_(2)0_(6) OER charge transfer DFT heterojunctions

Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses

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Opto-Electronic Advances 2021年第2期4卷 1-11页

作者： Hongtao Wang Chenglong Hao Han Lin Yongtian Wang Tian Lan Chengwei Qiu Baohua Jia Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyP.O.Box 218Hawthorn VIC 3122Australia Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education of ChinaSchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Engineering Product Development Pillar Singapore University of Technology and Design8 Somapah Road487372Singapore

Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses,offering new possibilities for myriads of miniaturization and interfacial ***-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 *** 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 *** experimentally validate our strategies via demonstrations of two graphene oxide metalenses:one with an ultra-long(~16λ)optical needle,and the other with axial multifocal spots,at the wavelength of 632.8 nm with a 200 nm thin *** proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.

关键词： femtosecond laser reduction graphene oxide metalens multifocal spots optical needle