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Two-photon polymerization lithography for imaging optics

International Journal of Extreme Manufacturing 2024年第04期 25-65页

作者： Hao Wang Cheng-Feng Pan Chi Li Kishan S Menghrajani Markus A Schmidt Aoling Li Fu Fan Yu Zhou Wang Zhang Hongtao Wang parvathi nair suseela nair John You En Chan Tomohiro Mori Yueqiang Hu Guangwei Hu Stefan A Maier Haoran Ren Huigao Duan Joel K W Yang College of Mechanical and Vehicle Engineering Hunan University Engineering Product Development Singapore University of Technology and Design Greater Bay Area Institute for Innovation Hunan University Department of Electrical and Computer Engineering National University of Singapore School of Physics and Astronomy Faculty of ScienceMonash University Leibniz Institute of Photonic Technology Abbe Center of Photonics and Faculty of Physics Otto Schott Institute of Material Research Institute of Materials Research and Engineering A*STAR (Agency for Science Technology and Research) Industrial Technology Center of Wakayama Prefecture School of Electrical and Electronic Engineering Nanyang Technological University Department of Physics Imperial College London

Optical imaging systems have greatly extended human visual capabilities, enabling the observation and understanding of diverse phenomena. Imaging technologies span a broad spectrum of wavelengths from x-ray to radio frequencies and impact research activities and our daily lives. Traditional glass lenses are fabricated through a series of complex processes, while polymers offer versatility and ease of production. However, modern applications often require complex lens assemblies, driving the need for miniaturization and advanced designs with micro-and nanoscale features to surpass the capabilities of traditional fabrication ***-dimensional(3D) printing, or additive manufacturing, presents a solution to these challenges with benefits of rapid prototyping, customized geometries, and efficient production,particularly suited for miniaturized optical imaging devices. Various 3D printing methods have demonstrated advantages over traditional counterparts, yet challenges remain in achieving nanoscale resolutions. Two-photon polymerization lithography(TPL), a nanoscale 3D printing technique, enables the fabrication of intricate structures beyond the optical diffraction limit via the nonlinear process of two-photon absorption within liquid resin. It offers unprecedented abilities, e.g. alignment-free fabrication, micro-and nanoscale capabilities, and rapid prototyping of almost arbitrary complex 3D nanostructures. In this review, we emphasize the importance of the criteria for optical performance evaluation of imaging devices, discuss material properties relevant to TPL, fabrication techniques, and highlight the application of TPL in optical imaging. As the first panoramic review on this topic, it will equip researchers with foundational knowledge and recent advancements of TPL for imaging optics, promoting a deeper understanding of the field. By leveraging on its high-resolution capability, extensive material range, and true 3D processing, alongside advances in mate

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Fabrication of opaque and transparent 3D structures using a single material via twophoton polymerisation lithography

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Light(Advanced Manufacturing) 2023年第3期4卷 243-250页

作者： parvathi nair suseela nair Chengfeng Pan Hao Wang Deepshikha Arora Qing Yang Steve Wu M.A.Rahman Jinghua Teng Joel K.W.Yang Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)#08-03 Innovis2 Fusionopolis Way138634Singapore Singapore University of Technology and Design 8 Somapah RoadSingapore 487372

Two-photon polymerisation lithography enables the three-dimensional(3D)-printing of high-resolution micron-and nano-scale *** that are 3D-printed using proprietary resins are transparent and are suitable as optical ***,achieving a mix of opaque and transparent structures in a single optical component is challenging and requires multiple material systems or the manual introduction of ink after *** this study,we investigated an overexposure printing process for laser decomposition,which typically produces uncontrollable and random‘burnt’***,we present a printing strategy to control this decomposition process,realising the on-demand printing of opaque or transparent structures in a single lithographic step using a single *** this method,opaque structures can be printed with a minimum feature size of approximately 10μm,which exhibit<15%transmittance at a thickness of approximately 30μ*** applied this process to print an opaque aperture integrated with a transparent lens to demonstrate an improved imaging contrast.

关键词： 3D printing Two-photon polymerisation lithography Optically opaque Laser decomposition Lens imaging contrast

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3D printed fiber sockets for plug and play micro-optics

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International Journal of Extreme Manufacturing 2021年第1期3卷 122-129页

作者： parvathi S nair Jonathan Trisno Hongtao Wang Joel K W Yang Singapore University of Technology and Design 8 Somapah Road487372Singapore Institute of Materials Research and Engineering(IMRE) A^(∗)STAR138634Singapore

Integrating micro-optical components at the end facet of an optical fiber enables compact optics to shape the output beam(***,focusing,and coupling to free space elements or photonic integrated circuits).However,the scalability of this approach is a longstanding challenge as these components must be aligned onto individual fiber *** this paper,we propose a socket that enables easy slotting of fibers,self-alignment,and coupling onto micro-optical *** integrated socket can be detached from the substrate upon fiber insertion to create a stand-alone optical *** is done using nanoscale 3D printing via two-photon polymerization lithography onto glass substrates,which allows multiple sockets to be patterned in a single *** investigated variations in socket design and evaluated the performance of optical elements for telecom *** obtained an alignment accuracy of∼3.5μ*** socket designs can be customized for high efficiency chip to fiber coupling and extended to other spectral ranges for free-form optics.

关键词： integrated socket alignment fiber slotting fiber connector two-photon polymerization lithography

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