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Smart mid-infrared metasurface microspectrometer gas sensing system

Microsystems & Nanoengineering 2024年第3期10卷 273-281页

作者： Jiajun Meng Sivacarendran Balendhran Ylias Sabri Suresh K.Bhargava kenneth B.crozier School of Physics University of MelbourneVictoriaAustralia Australian Research Council(ARC)Centre of Excellence for Transformative Meta-Optical Systems(TMOS) University of MelbourneVictoriaAustralia Centre for Advanced Materials&Industrial Chemistry(CAMIC) STEM collegeRMIT UniversityVictoriaAustralia Department of Electrical and Electronic Engineering University of MelbourneVictoriaAustralia

Smart,low-cost and portable gas sensors are highly desired due to the importance of air quality monitoring for environmental and defense-related ***,electrochemical and nondispersive infrared(IR)gas sensors are designed to detect a single specific *** IR spectroscopy-based sensors provide superior performance,their deployment is limited due to their large size and high *** this study,a smart,low-cost,multigas sensing system is demonstrated consisting of a mid-infrared microspectrometer and a machine learning *** microspectrometer is a metasurface filter array integrated with a commercial IR camera that is consumable-free,compact(~1 cm^(3))and lightweight(~1 g).The machine learning algorithm is trained to analyze the data from the microspectrometer and predict the gases *** system detects the greenhouse gases carbon dioxide and methane at concentrations ranging from 10 to 100%with 100%*** also detects hazardous gases at low concentrations with an accuracy of 98.4%.Ammonia can be detected at a concentration of 100 ***,methyl-ethyl-ketone can be detected at its permissible exposure limit(200 ppm);this concentration is considered low and *** study demonstrates the viability of using machine learning with IR spectroscopy to provide a smart and low-cost multigas sensing platform.

关键词： Smart gases system

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Quo vadis,plasmonic optical tweezers?

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Light(Science & Applications) 2019年第1期8卷 878-883页

作者： kenneth B.crozier School of Physics and Department of Electrical and Electronic EngineeringThe University of MelbourneMelbourneVictoria 3010Australia

Conventional optical tweezers based on traditional optical microscopes are subject to the diffraction limit,making the precise trapping and manipulation of very small particles *** optical tweezers can surpass this constraint,but many potential applications would benefit from further enhanced performance and/or expanded *** this Perspective,we discuss trends in plasmonic tweezers and describe important opportunities presented by its interdisciplinary combination with other techniques in *** furthermore highlight several open questions concerning fundamentals that are likely to be important for many potential applications.

关键词： optical furthermore precise

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Ultra-resolution scalable microprinting

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微系统与纳米工程(英文) 2023年第3期9卷 195-207页

作者： Callum Vidler kenneth crozier David Collins Department of Biomedical Engineering University of MelbourneMelbourneVICAustralia School of Physics University of MelbourneVictoria 3010Australia Department of Electrical and Electronic Engineering University of MelbourneVictoria 3010Australia Australian Research Council(ARC)Centre of Excellence for Transformative Meta-Optical Systems University of MelbourneVictoria 3010Australia The Graeme Clark Institute The University of MelbourneParkville 3052 VICAustralia

Projection micro stereolithography(PµSL)is a digital light processing(DLP)based printing technique for producing structured *** this approach there is often a tradeoff between the largest object that can be printed and the minimum feature size,with higher resolution generally reducing the overall extent of the *** ability to produce structures with high spatial resolution and large overall volume,however,is immensely important for the creation of hierarchical materials,microfluidic devices and bioinspired *** this work,we report a low-cost system with 1µm optical resolution,representing the highest resolution system yet developed for the creation of micro-structured parts whose overall dimensions are nevertheless on the order of *** do so,we examine the limits at which PµSL can be applied at scale as a function of energy dosage,resin composition,cure depth and in-plane feature *** doing so we develop a unique exposure composition approach that allows us to greatly improve the resolution of printed *** ability to construct high-resolution scalable microstructures has the potential to accelerate advances in emerging areas,including 3D metamaterials,tissue engineering and bioinspired constructs.

关键词： lithography resolution printing

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Light field on a chip: metasurface-based multicolor holograms

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Advanced Photonics 2021年第2期3卷 1-14页

作者： Dandan Wen Jasper J.Cadusch Jiajun Meng kenneth B.crozier University of Melbourne Department of Electrical and Electronic EngineeringVictoriaAustralia University of Melbourne School of PhysicsVictoriaAustralia University of Melbourne Australian Research CouncilCentre of Excellence for Transformative Meta-Optical SystemsVictoriaAustralia

Multicolor holography can faithfully record the color,depth,parallax,and other properties of scenes and have thus found numerous applications,for example,in optical document security,nonvolatile data storage,and virtual or augmented reality *** metasurfaces present multiple degrees of freedom to manipulate the properties of optical fields at visible *** in turn provide opportunities for metasurface-based multicolor *** describe recent developments in multicolor metasurface *** are categorized based on their color-separating mechanisms rather than their structural properties,such as whether they are plasmonic or *** hope this review will provide readers with new insights and thus help extend applications of metasurface-based multicolor holography to other fields.

关键词： multicolor hologram metasurface

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