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Multimodal epidermal devices for hydration monitoring

Microsystems & Nanoengineering 2017年第1期3卷 267-277页

作者： Siddharth Krishnan Yunzhou Shi R.Chad Webb Yinji Ma Philippe Bastien Kaitlyn E.Crawford Ao Wang Xue Feng Megan Manco Jonas Kurniawan edward tir Yonggang Huang Guive Balooch Rafal M.Pielak John A.Rogers Department of Materials Science and Engineering Frederick Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA L’Oreal Tech Incubator California Research Center953 Indiana StreetSan FranciscoCA 94107USA Department of Civil and Environmental Engineering Mechanical EngineeringMaterials Science and EngineeringNorthwestern UniversityEvanstonIL 60208USA L’Oréal Research and Innovation 1 Avenue Eugène SchullerAulnay sous Bois 93601France Department of Engineering Mechanics Center for Mechanics and MaterialsTsinghua UniversityBeijing 100084China L’Oréal Early Clinical 133 Terminal AvenueClarkNJ 07066USA Departments of Materials Science and Engineering Biomedical EngineeringChemistryMechanical EngineeringElectrical Engineering and Computer Scienceand Neurological SurgeryCenter for Bio-Integrated ElectronicsSimpson Querrey Institute for Nano/biotechnologyNorthwestern UniversityEvanstonIL 60208USA

Precise,quantitative in vivo monitoring of hydration levels in the near surface regions of the skin can be useful in preventing skinbased pathologies,and regulating external *** we introduce multimodal sensors with important capabilities in this context,rendered in soft,ultrathin,‘skin-like’formats with numerous advantages over alternative technologies,including the ability to establish intimate,conformal contact without applied pressure,and to provide spatiotemporally resolved data on both electrical and thermal transport properties from sensitive regions of the *** in vitro studies and computational models establish the underlying measurement principles and associated approaches for determination of temperature,thermal conductivity,thermal diffusivity,volumetric heat capacity,and electrical impedance using simple analysis *** studies on 20 patients subjected to a variety of external stimuli validate the device operation and allow quantitative comparisons of measurement capabilities to those of existing state-of-the-art tools.

关键词： epidermal electronics hydration monitoring thermal characterization

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Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs

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Light(Science & Applications) 2021年第10期10卷 1840-1848页

作者： Peng Mao Changxu Liu Xiyan Li Mengxia Liu Qiang Chen Min Han Stefan A.Maier edward H.Sargent Shuang Zhang School of Physics and Astronomy University of BirminghamB152TT BirminghamUK National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Centre of Advanced MicrostructuresNanjing UniversityNanjing 210093China Chair in Hybrid Nanosystems Nanoinstitute MunichFaculty of PhysicsLudwigMaximilians-Universitaet Muenchen80539 MuenchenGermany Department of Electrical and Computer Engineering University of Toronto35 St.George StreetTorontoON M5S 1A4Canada Key Laboratory of Intelligent Optical Sensing and Manipulation(Nanjing University) Ministry of EducationNanjingChina Department of Physics Imperial College LondonLondon SW72AZUK Department of Physics University of Hong KongHong Kong 999077China Department of Electrical and Electronic Engineering University of Hong KongHong Kong 999077China

While total internal reflection(tir)lays the foundation for many important applications,foremost fibre optics that revolutionised information technologies,it is undesirable in some other applications such as light-emitting diodes(LEDs),which are a backbone for energy-efficient light *** the case of LEDs,tir prevents photons from escaping the constituent high-index *** in material science have led to good efficiencies in generating photons from electron–hole pairs,making light extraction the bottleneck of the overall efficiency of *** recent years,the extraction efficiency has been improved,using nanostructures at the semiconductor/air interface that outcouple trapped photons to the outside ***,the design of geometrical features for light extraction with sizes comparable to or smaller than the optical wavelength always requires sophisticated and timeconsuming fabrication,which causes a gap between lab demonstration and industrial-level *** by lightning bugs,we propose and realise a disordered metasurface for light extraction throughout the visible spectrum,achieved with single-step *** applying such a cost-effective light extraction layer,we improve the external quantum efficiency by a factor of 1.65 for commercialised GaN LEDs,demonstrating a substantial potential for global energy-saving and sustainability.

关键词： light backbone consuming

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