Understanding the sorption dynamics between water molecules and various solid surfaces is of great interest in diverse fundamental and industrial research.For studying such dynamics in a microsystem,existing investiga...Understanding the sorption dynamics between water molecules and various solid surfaces is of great interest in diverse fundamental and industrial research.For studying such dynamics in a microsystem,existing investigations mainly focus on sorption behaviors mediated by external temperature variations.Here,we demonstrate a route to in situ sensitive detection of laser irradiation-induced localized water molecule desorption at a sub-monolayer level on an oxide surface.Harnessing a tailored set of optical whispering-gallery-mode(WGM)resonances in a nanomembrane-based microtube cavity,the desorption can be tracked by resonance mode shift in real-time,and further explained using a combination of pseudo-firstorder and pseudo-second-order models.Additionally,upon adjusted laser excitation locations,the axial-mode-dependent responses enable the retrieval of corresponding profiles of desorption-induced perturbation at equilibrium.This study provides new insights into molecular desorption kinetics and introduces a spatially resolved sensing technique with applications in surface science,molecular sensing,and the study of desorption dynamics at the nanoscale.展开更多
Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects.More recently,the possibility of per...Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects.More recently,the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods.The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength;with this confinement,the plasmonic field facilitates trapping of various nanostructures and materials with higher precision.The successful manipulation of small particles has fostered numerous and expanding applications.In this paper,we review the principles of and developments in plasmonic tweezers techniques,including both nanostructure-assisted platforms and structureless systems.Construction methods and evaluation criteria of the techniques are presented,aiming to provide a guide for the design and optimization of the systems.The most common novel applications of plasmonic tweezers,namely,sorting and transport,sensing and imaging,and especially those in a biological context,are critically discussed.Finally,we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.展开更多
Optical traps use focused laser beams to generate forces on targeted objects ranging in size from nanometers to micrometers. However, for their high coefficients of scattering and absorption, micrometer-sized metallic...Optical traps use focused laser beams to generate forces on targeted objects ranging in size from nanometers to micrometers. However, for their high coefficients of scattering and absorption, micrometer-sized metallic particles were deemed non-trappable in three dimensions using a single beam. This barrier is now removed. We demon- strate, both in theory and experiment, three-dimensional （3D） dynamic all-optical manipulations of micrometer- sized gold particles under high focusing conditions. The force of gravity is found to balance the positive axial optical force exerted on particles in an inverted optical tweezers system to form two trapping positions along the vertical direction. Both theoretical and experimental results confirm that stable 3D manipulations are achievable for these particles regardl for a variety of in-depth ess of beam polarization and wavelength. research requiting metallic particles. The present work opens up new opportunities .展开更多
基金the support from the National Key R&D Program of China under Grant 2023YFE0208700the National Natural Science Foundation of China under Grants 62422503,12474375,12274182,and 62305093+2 种基金Science and Technology Innovation Commission of Shenzhen under Grants JCYJ20220531095604009,JCYJ20240813104819027,RCYX20221008092907027,and GXWD20231129101105001Hainan Province"Nanhai New Star"Science and Technology Innovation Talent Platform Program under Grant NHXXRCXM202304the Innovation/Entrepreneurship Program of Jiangsu Province under Grants JSSCTD202146 and JSSCRC2021538.
文摘Understanding the sorption dynamics between water molecules and various solid surfaces is of great interest in diverse fundamental and industrial research.For studying such dynamics in a microsystem,existing investigations mainly focus on sorption behaviors mediated by external temperature variations.Here,we demonstrate a route to in situ sensitive detection of laser irradiation-induced localized water molecule desorption at a sub-monolayer level on an oxide surface.Harnessing a tailored set of optical whispering-gallery-mode(WGM)resonances in a nanomembrane-based microtube cavity,the desorption can be tracked by resonance mode shift in real-time,and further explained using a combination of pseudo-firstorder and pseudo-second-order models.Additionally,upon adjusted laser excitation locations,the axial-mode-dependent responses enable the retrieval of corresponding profiles of desorption-induced perturbation at equilibrium.This study provides new insights into molecular desorption kinetics and introduces a spatially resolved sensing technique with applications in surface science,molecular sensing,and the study of desorption dynamics at the nanoscale.
基金the National Natural Science Foundation of China(91750205,61975128,61975129 and 61427819)Leading Talents of Guangdong Province Programme(00201505)+1 种基金Natural Science Foundation of Guangdong Province(2016A030312010 and 2019TQ05X750)and Science and Technology Innovation Commission of Shenzhen(KQTD2017033011044403,ZDSYS201703031605029,KQTD20180412181324255,JCYJ20180305125418079,andJCYJ2017818144338999).
文摘Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects.More recently,the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods.The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength;with this confinement,the plasmonic field facilitates trapping of various nanostructures and materials with higher precision.The successful manipulation of small particles has fostered numerous and expanding applications.In this paper,we review the principles of and developments in plasmonic tweezers techniques,including both nanostructure-assisted platforms and structureless systems.Construction methods and evaluation criteria of the techniques are presented,aiming to provide a guide for the design and optimization of the systems.The most common novel applications of plasmonic tweezers,namely,sorting and transport,sensing and imaging,and especially those in a biological context,are critically discussed.Finally,we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.
基金National Natural Science Foundation of China(NSFC)(91750205,61377052,61422506,61427819,61605117)National Key Basic Research Program of China(973)(2015CB352004)+3 种基金National Key Research and Development Program of China(2016YFC0102401)Leading Talents of Guangdong Province Program(00201505)Natural Science Foundation of Guangdong Province(2016A030312010,2016A030310063)Excellent Young Teacher Program of Guangdong Province(YQ2014151)
文摘Optical traps use focused laser beams to generate forces on targeted objects ranging in size from nanometers to micrometers. However, for their high coefficients of scattering and absorption, micrometer-sized metallic particles were deemed non-trappable in three dimensions using a single beam. This barrier is now removed. We demon- strate, both in theory and experiment, three-dimensional （3D） dynamic all-optical manipulations of micrometer- sized gold particles under high focusing conditions. The force of gravity is found to balance the positive axial optical force exerted on particles in an inverted optical tweezers system to form two trapping positions along the vertical direction. Both theoretical and experimental results confirm that stable 3D manipulations are achievable for these particles regardl for a variety of in-depth ess of beam polarization and wavelength. research requiting metallic particles. The present work opens up new opportunities .
