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Two-photon polymerization lithography for imaging optics

International Journal of Extreme Manufacturing 2024年第4期6卷 21-60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 UniversityChangsha 410082People's Republic of China Engineering Product Development Singapore University of Technology and DesignSingapore 487372Singapore Greater Bay Area Institute for Innovation Hunan UniversityGuangzhou 511300People's Republic of China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117576Singapore School of Physics and Astronomy Faculty of ScienceMonash UniversityMelbourneVictoria 3800Australia Leibniz Institute of Photonic Technology 07745 JenaGermany Abbe Center of Photonics and Faculty of Physics FSU Jena07745 JenaGermany Otto Schott Institute of Material Research FSU Jena07745 JenaGermany Institute of Materials Research and Engineering A*STAR(Agency for Science Technology and Research)Singapore 138634Singapore Industrial Technology Center of wakayama Prefecture Wakayama 6496261Japan School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore Department of Physics Imperial College LondonLondon SW72AZUnited Kingdom

Optical imaging systems have greatly extended human visual capabilities,enabling the observation and understanding of diverse *** technologies span a broad spectrum of wavelengths from x-ray to radio frequencies and impact research activities and our daily *** glass lenses are fabricated through a series of complex processes,while polymers offer versatility and ease of ***,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 *** 3D printing methods have demonstrated advantages over traditional counterparts,yet challenges remain in achieving nanoscale ***-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 *** offers unprecedented abilities,***-free fabrication,micro-and nanoscale capabilities,and rapid prototyping of almost arbitrary complex 3D *** 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 *** 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 *** leveraging on its high-resolution capability,extensive material range,and true 3D processing,alongside advances in materials,fabrication,and design,we en

关键词： two-photon polymerization lithography 3D printing additive manufacturing imaging optics and nanophotonics

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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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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 exhibitkness 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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High-throughput fabrication of large-scale metasurfaces using electron-beam lithography with SU-8 gratings for multilevel security printing

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Photonics Research 2023年第3期11卷 I0040-I0047页

作者： YOU SIN TAN HAO wANG HONGTAO wANG CHENGFENG PAN joel k.w.yang Singapore University of Technology and Design 487372 SingaporeSingapore Institute of Materials Research and Engineering A*STAR(Agency for ScienceTechnology and Research)138634 SingaporeSingapore

The field of metasurface research has rapidly developed in the past ***-beam lithography(EBL)is an excellent tool used for rapid prototyping of ***,Gaussian-beam EBL generally struggles with low *** conjunction with the recent rise of interest in metasurfaces made of low-index dielectric materials,we propose in this study the use of a relatively unexplored chemically amplified resist,SU-8 with EBL,as a method for rapid prototyping of low-index *** demonstrate the use of SU-8 grating on silicon for cost-efficient fabrication of an all-dielectric multilevel security print for anti-counterfeiting purposes,which encrypt different optical information with different light illumination conditions,namely,bright-field reflection,dark-field reflection,and cross-polarized *** large-scale print(1 mm^(2))could be exposed in a relatively short time(~11 min)due to the ultrahigh sensitivity of the resist,while the feature size of~200 nm was maintained,demonstrating that SU-8 EBL resist serves as a good candidate for rapid prototyping of metasurface *** results could find applications in the general area of increasing EBL patterning speed for a variety of other devices and structures.

关键词： lithography beam dielectric

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In-plane coherent control of plasmon resonances for plasmonic switching and encoding

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Light(Science & Applications) 2019年第1期8卷 994-1003页

作者： Liyong Jiang Tingting Yin Alexander M.Dubrovkin Zhaogang Dong Yuntian Chen weijin Chen joel k.w.yang Zexiang Shen Department of Physics School of ScienceNanjing University of Science and TechnologyNanjing 210094China Centre for Disruptive Photonic Technologies The Photonics InstituteSchool of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371Singapore Institute of Materials Research and Engineering A*STAR(Agency for ScienceTechnology and Research)#08-03 InnovisSingapore 138634Singapore School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Singapore University of Technology and Design 8 Somapah RoadSingapore 487372Singapore

Considerable attention has been paid recently to coherent control of plasmon resonances in metadevices for potential applications in all-optical light-with-light signal modulation and image *** reports based on out-ofplane coherent control of plasmon resonances were established by modulating the position of a metadevice in standing *** we show that destructive and constructive absorption can be realized in metallic nano-antennas through in-plane coherent control of plasmon resonances,which is determined by the distribution rule of electricalfield components of *** provide proof-of-principle demonstrations of plasmonic switching effects in a gold nanodisk monomer and dimer,and propose a plasmonic encoding strategy in a gold nanodisk ***-plane coherent control of plasmon resonances may open a new avenue toward promising applications in optical spectral enhancement,imaging,nanolasing,and optical communication in nanocircuits.

关键词： coherent plane resonance

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Entangled photons enabled ultrafast stimulated Raman spectroscopy for molecular dynamics

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Light(Science & Applications) 2024年第8期13卷 1615-1622页

作者： Jiahao joel Fan Zhe-Yu Ou Zhedong Zhang Department of Physics City University of Hong KongKowloonHong Kong SARChina City University of Hong kong Shenzhen Research InstituteShenzhenGuangdongChina

Quantum entanglement has emerged as a great resource for studying the interactions between molecules and *** propose a new scheme of stimulated Raman scattering with entangled photons.A quantum ultrafast Raman spectroscopy is developed for condensed-phase molecules,to monitor the exciton populations and *** results are obtained,showing an entanglement-enabled time-frequency scale not attainable by classical *** Raman signal presents an unprecedented selectivity of molecular correlation functions,as a result of the Hong-Ou-Mandel *** work suggests a new paradigm of using an unconventional interferometer as part of spectroscopy,with the potential to unveil advanced information about complex materials.

关键词： materials spectroscopy selectivity

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Nanoscale mapping of optically inaccessible bound-states-in-the-continuum

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Light(Science & Applications) 2022年第2期11卷 188-196页

作者： Zhaogang Dong Zackaria Mahfoud Ramón Paniagua-Domínguez Hongtao wang Antonio I.Fernández-Domínguez Sergey Gorelik Son Tung Ha Febiana Tjiptoharsono Arseniy I.kuznetsov Michel Bosman joel k.w.yang Institute of Materials Research and Engineering A*STAR(Agency for ScienceTechnology and Research)2 Fusionopolis Way#08-03 Innovis138634 SingaporeSingapore Department of Materials Science and Engineering National University of Singapore9 Engineering Drive 1117575 SingaporeSingapore Singapore University of Technology and Design 8 Somapah Road487372 SingaporeSingapore Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center Universidad Autónoma de Madrid28049 MadridSpain Singapore Institute of Food and Biotechnology Innovation A*STAR(Agency for ScienceTechnology and Research)31 Biopolis Way#01-02 Nanos138669 SingaporeSingapore

Bound-states-in-the-continuum(BIC)is an emerging concept in nanophotonics with potential impact in applications,such as hyperspectral imaging,mirror-less lasing,and nonlinear harmonic *** true BIC modes are nonradiative,they cannot be excited by using propagating light to investigate their optical *** this paper,for the 1st time,we map out the strong near-field localization of the true BIC resonance on arrays of silicon nanoantennas,via electron energy loss spectroscopy with a sub-1-nm electron *** systematically breaking the designed antenna symmetry,emissive quasi-BIC resonances become *** gives a unique experimental tool to determine the coherent interaction length,which we show to require at least six neighboring antenna *** importantly,we demonstrate that quasi-BIC resonances are able to enhance localized light emission via the Purcell effect by at least 60 times,as compared to unpatterned *** work is expected to enable practical applications of designed,ultra-compact BIC antennas such as for the controlled,localized excitation of quantum emitters.

关键词： antenna states mapping

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Stepwise-Nanocavity-Assisted Transmissive Color Filter Array Microprints

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Research 2018年第1期2018卷 34-43页

作者： Yasi wang Mengjie Zheng Qifeng Ruan Yanming Zhou Yiqin Chen Peng Dai Zhengmei yang Zihao Lin Yuxiang Long Ying Li Na Liu Cheng-wei Qiu joel k.w.yang Huigao Duan State key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China School of Physics and Electronics Hunan UniversityChangsha 410082China SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China 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 RoadSingapore 487372Singapore kirchhof Institute for Physics University of HeidelbergIm Neuenheimer Feld 22769120 HeidelbergGermany

Visible-light color flters using patterned nanostructures have attracted much interest due to their various advantages such as compactness,enhanced stability,and environmental friendliness compared with traditional pigment or dye-based optical *** most existing studies are based on planar nanostructures with lateral variation in size,shape,and arrangement,the vertical dimension of structures is a long-ignored degree of freedom for the structural ***,we demonstrate a synthetic platform for transmissive color flter array by coordinated manipulations between height-varying nanocavities and their lateral flling *** thickness variation of those nanocavities has been fully deployed as an alternative degree of freedom,yielding vivid colors with wide gamut and excellent *** results show that the color-rendering capability of the pixelated nanocavities can be still retained as pixels are miniaturized to 500 *** between closely spaced pixels of a Bayer color flter arrangement was calculated,showing minimal crosstalk for 1μm2 square *** work provides an approach to designing and fabricating ultracompact color flter arrays for various potential applications including stained-glass microprints,microspectrometers,and high-resolution image sensing systems.

关键词： arrangement rendering cavity

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Human endogenous retrovirus type-w and multiple sclerosis–related smoldering neuroinflammation

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Neural Regeneration Research 2025年第3期20卷 813-814页

作者： joel Gruchot Laura Reiche Andrew Chan Robert Hoepner Patrick küry Department of Neurology Medical Faculty and University Hospital DüsseldorfHeinrich Heine University DüsseldorfDüsseldorfGermany Department of Neurology InselspitalBern University Hospital and University of BernBernSwitzerland

Introduction to human endogenous retrovirus type-w(HERV-w): Genomic inheritance from the past includes retroviral sequences that have been stably incorporated into our genomes and account for up to 8% of human DNA.

关键词： endogenous inflammation Human

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Gastroesophageal reflux following per-oral endoscopic myotomy:Can we improve outcomes?

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world Journal of Gastroenterology 2024年第22期30卷 2834-2838页

作者： Inian Samarasam Raj kumar joel Anna B Pulimood Department of Surgery Upper Gastrointestinal Surgery UnitChristian Medical College&HospitalVellore 632004TamilnaduIndia Department of Cardiothoracic Surgery Christian Medical College&HospitalVellore 632004TamilnaduIndia Department of Gastrointestinal Sciences Christian Medical College and HospitalVellore 632004Tamil NaduIndia

This editorial is an analysis the review article by Nabi et al recently published in this *** Cardia is a disease whose pathophysiology is still *** is known that there is inflammation of unknown aetiology leading to loss of ganglion cells in the muscularis *** end result is lower oesophageal sphincter spasm,loss of receptive relaxation,decreased oesophageal peristalsis,all leading on to varying degrees of *** treatment of this condition is palliative in nature,performed by myotomy of the lower oesophagus either surgically or *** reflux disease(GERD)has been associated with the myotomy performed,particularly with the Peroral Endoscopic Myotomy(POEM)*** et al have provided an excellent overview of the latest developments in predicting,preventing,evaluating,and managing GERD subsequent to *** on this theme,this review article explores the concept of using histology of the oesophageal muscle layer,to grade the disease and thereby help tailoring the length/type of myotomy performed during the POEM *** the future,will a histology based algorithm available preoperatively,help modify the POEM procedure,thereby decreasing the incidence of GERD associated with POEM?

关键词： Achalasia cardia Peroral endoscopic myotomy Laparoscopic Heller’s myotomy Histopathology Histologic grading

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