【摘 要】
：
Recent developments in surface-enhanced Raman scattering (SERS) enable observation of single-bond vibrations in real time at room temperature.By contrast,mid-infrared (MIR) vibrational spectroscopy is limited to inefficient slow detection.Here we develop
【机 构】
：
NanoPhotonics Centre,Cavendish Laboratory,Department of Physics,JJ Thompson Avenue,University of Cam
论文部分内容阅读
Recent developments in surface-enhanced Raman scattering (SERS) enable observation of single-bond vibrations in real time at room temperature.By contrast,mid-infrared (MIR) vibrational spectroscopy is limited to inefficient slow detection.Here we develop a new method for MIR sensing using SERS.This method utilizes nanoparticle-on-foil(NPoF) nanocavities supporting both visible and MIR plasmonic hotspots in the same nanogap formed by a monolayer of molecules.Molecular SERS signals from individual NPoF nanocavities are modulated in the presence of MIR photons.The strength of this modulation depends on the MIR wavelength,and is maximized at the 6-12 μm absorption bands of SiO2 or polystyrene placed under the foil.Using a single-photon lock-in detection scheme we time-resolve the rise and decay of the signal in a few 100 ns.Our observations reveal that the phonon resonances of SiO2 can trap intense MIR surface plasmons within the Reststrahlen band,tuning the visible-wavelength localized plasmons by reversibly perturbing the localized few-nm-thick water shell trapped in the nanostructure crevices.This suggests new ways to couple nanoscale bond vibrations for optomechanics,with potential to push detection limits down to single-photon and single-molecule regimes.
其他文献
文化性与艺术性是建筑设计立面以及空间的抽象概念元素,这些抽象的概念元素可以运用相应的装饰元素构图元素进行表达出来,而装饰性元素还可进一步采用具有文化气息的构件或者具有图案纹理的构件进行表达与运用,以便将整体的建筑形象塑造地更具有文化艺术气息,更好地烘托出建筑的意象美学.rn文化性装饰建筑效果图.建筑的细节部分可以采用具有文化气息以及传统的构件形式进行表达,并可以和整体的建筑立面结合起来,形成具有文化气息浓重的建筑立面.在建筑立面设计的前沿部分采用双柱进行支撑,用双柱限定整体的构图比例关系,在柱与柱之间采用
EditorialrnRecently,Prof.Jianhua Jiang from Soochow University of China accepted an interview from Light:Science &Applications.Prof.Jiang works on topological photonics,topological phononics,and nonequilibrium physics.On this issue,he discusses the challe
随着“乡村振兴”战略的持续推进,以及城镇一体化建设的不断加快,传统乡村建筑资源逐渐减少,在此背景下,“乡愁”成为大多数社会成员所表现出的一种状态,以“留住乡愁”为核心的乡村建筑资源保护是现阶段乡村“绿色经济”发展的重要保障,并推动了乡村建筑的传承与发展.“留住乡愁”视域下乡村建筑是在传统乡村建筑的基础上,通过形象和具象两种方式,满足人们在精神层面对于传统乡村建筑、乡村文化和生态的追求,这也是新时期乡村建筑传承和发展的重要形式之一.
Electronic properties of selected quantum dot (QD) systems are surveyed based on the multi-band k·p method,which we benchmark by direct comparison to the empirical tight-binding algorithm,and we also discuss the newly developed “linear combination of quan
展示空间的发展伴随着科学技术的进步不断地出现的新的形态语言,材料和技术的创新给展示空间设计带来深远的影响.二十一世纪随着信息技术革命的到来,数字媒体被广泛运用到展示设计空间中,把展示空间设计的内容从形态图像的传统方式演变到综合造型、色彩、光影、声音影像传播等多种传播方式.在信息时代,伴随着数字媒体的发展,展示空间设计有了新的突破.它已经不仅仅只是在特定空间内对展品的有机组合,还包括在空间中积极地融入虚拟现实、多媒体互动、全息成像、数字影院、光影等数字媒体技术,来演绎数字化的媒体信息空间.这种趋势主要表现在
Ghost imaging (GI) facilitates image acquisition under low-light conditions by single-pixel measurements and thus has great potential in applications in various fields ranging from biomedical imaging to remote sensing.However,GI usually requires a large a
EditorialrnMajor developments were made recently in both VR (virtual reality) and AR (augmented reality) technologies,which became the focus of attention.In recent years,MR (mixed reality) technology has also emerged,and optical components play an irrepla
人体特征自有奥妙所在,其所固有的不可复制的唯一性使得由此生成的生物密钥无法被失窃或遗忘,科技便是赋予这一奥妙以现实想象和落地执行的最佳工具.rn道在日新,新者生机也.rn生物识别走向“多模态”rn生物特征的识别推动机器走向自动探测、捕获、处理、分析数字化生理或行为信号的高级智能.比尔·盖茨曾预言:“以人类生物特征——指纹、语音、面像等方式进行验证的生物识别技术在今后数年内将成为IT产业最为重要的技术革命.”“无密码时代”变革背后的引领者,正是生物识别技术.
Microscopic electric fields govern the majority of elementary excitations in condensed matter and drive electronics at frequencies approaching the Terahertz (THz) regime.However,only few imaging schemes are able to resolve sub-wavelength fields in the THz
Recording electric field evolution in single-shot with THz bandwidth is needed in science including spectroscopy,plasmas,biology,chemistry,Free-Electron Lasers,accelerators,and material inspection.However,the potential application range depends on the pos