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Advances of surface-enhanced Raman and IR spectroscopies: from nano/microstructures to macro-optical design

Light(Science & Applications) 2021年第9期10卷 1588-1606页

作者： Hai-Long Wang En-Ming You Rajapandiyan Panneerselvam Song-Yuan Ding Zhong-Qun Tian State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Department of Chemistry SRM University-APAmaravathiAndhra PradeshIndia

Raman and infrared(IR)spectroscopy are powerful analytical techniques,but have intrinsically low detection *** have been three major steps(i)to advance the optical system of the light excitation,collection,and detection since 1920s,(ii)to utilize nanostructure-based surface-enhanced Raman scattering(SERS)and surface-enhanced infrared absorption(SEIRA)since 1990s,and(iii)to rationally couple(i)and(ii)for maximizing the total detection sensitivity since *** surveying the history of SERS and SEIRA,we outline the principle of plasmonics and the different mechanisms of SERS and *** describe various interactions of light with nano/microstructures,localized surface plasmon,surface plasmon polariton,and lightning-rod *** coupling effects can significantly increase the surface sensitivity by designing nanoparticle–nanoparticle and nanoparticle–substrate *** the nano/microstructures have specific optical near-field and far-field behaviors,we focus on how to systematically design the macro-optical systems to maximize the excitation efficiency and detection *** enumerate the key optical designs in particular ATR-based operation modes of directional excitation and emission from visible to IR spectral *** also present some latest advancements on scanning-probe microscopy-based nanoscale ***,prospects and further developments of this field are given with emphasis on emerging techniques and methodologies.

关键词： surface excitation utilize

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NASA SAGE SBIR structural, thermal, optical performance (STOP) analysis correlation to wavefront error testing 10

NASA SAGE SBIR structural, thermal, optical performance (STO...

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Conference on Photonic Instrumentation engineering X

作者： Buleri, Christine Yow, Cameryn Carey, Janak Damadeo, Robert Halterman, Alexander Hill, Charles Leckey, John Maccarrone, Alicia Weiner, Samantha Yacoby, Shimshone Quartus Engn 9689 Towne Ctr Dr San Diego CA 92121 USA NASA Langley Res Ctr 1 Nasa Dr Hampton VA 23666 USA

ISBN: (纸本)9781510659612;9781510659629

In conjunction with the NASA LaRC SAGE IV Pathfinder team, Quartus has developed a small format near-diffraction limited telescope designed to package into a 6U CubeSat. The SAGE IV Pathfinder telescope utilizes analytical models and designs that can be leveraged to meet a broad range of scientific optical mission needs by creating a family of semi-custom small format space-borne optical systems. During the initial phases of a science mission, a systems engineering assessment can be performed to identify existing designs and analysis tools that can be leveraged to meet many key requirements. This would allow limited resources to then be focused on developing required new components, as opposed to designing the entire optical system from the bottom up. This accelerates technical readiness level (TRL) progression on semi-custom small format precision optical systems, reducing instrument costs, and achieving economy of scale typically not available on one-off science payloads. The current SAGE SBIR Phase ii is a research program utilizing a SAGE-like design for development of STOP analysis correlation methodologies. Wavefront error (WFE) is captured over a variety of temperature ranges for comparison to finite element model (FEM) predictions. The accuracy and repeatability of the WFE measurement process over temperature is reviewed. Best practices for accurate STOP analysis and WFE predictions are summarized including modeling parameters, material properties, and strength and distortion assessments.

关键词： SAGE IV SBIR STOP FEM FEA Correlation WFE Thermal Testing Nastran Zemax SigFit

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Applications of bio-derived/bio-inspired materials in the field of interfacial solar steam generation

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Nano Research 2022年第4期15卷 3122-3142页

作者： Yang Geng Kai Jiao Xu Liu Peijin Ying Omololu Odunmbaku Yaoxin Zhang Swee Ching Tan Ling Li Wei Zhang Meng Li MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials&Devices Joint LaboratorySchool of Energy&Power EngineeringChongqing UniversityChongqing 400044China Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China Department of Materials Science and Engineering CQU-NUS Renewable Energy Materials&Devices Joint LaboratoryNational University of SingaporeSingapore 117573Singapore Department of Mechanical Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

Interfacial solar steam generation(ISSG)system has attracted extensive attention as a sustainable desalination technology because of its cost efficiency and zero fossil-energy *** at optimizing the desalination properties,materials and system design have been the current research ***,many novel bio-derived/bio-inspired design strategies were proposed owing to their highly efficient structures inherited from nature,which were fine-tuned over eons of evolution,as well as their low cost and ease of *** this review,we are going to systematically report recent progress of various bio-derived/bio-inspired strategies in terms of optical design,wetting,thermal management,and overall system design,presenting an overview of the current challenges of bio-inspired materials in ISSG system and other application *** article is intended to provide a comprehensive review of recent developments about bio-derived/bio-inspired materials in ISSG system and conclude with suggestions regarding further research directions for performance enhancement through design of bio-derived/bio-inspired materials.

关键词： interfacial solar steam generation bio-derived materials bio-inspired materials solar-thermal conversion thermal management

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Band-structure-engineered high-gain LWIR photodetector based on a type-Ⅱ superlattice

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Light(Science & Applications) 2021年第2期10卷 140-146页

作者： Arash Dehzangi Jiakai Li Manijeh Razeghi Center for Quantum Devices Department of Electrical and Computer EngineeringNorthwestern UniversityEvanstonIL 60208USA

The LWIR and longer wavelength regions are of particular interest for new developments and new approaches to realizing long-wavelength infrared(LWIR)photodetectors with high detectivity and high *** photodetectors are highly desirable for applications such as infrared earth science and astronomy,remote sensing,optical communication,and thermal and medical ***,we report the design,growth,and characterization of a high-gain band-structure-engineered LWIR heterojunction phototransistor based on type-Ⅱ *** 1/e cut-off wavelength of the device is 8.0 *** 77 K,unity optical gain occurs at a 90 mV applied bias with a dark current density of 3.2×10^(-7)A/cm^(2).The optical gain of the device at 77 K saturates at a value of 276 at an applied bias of 220 *** saturation corresponds to a responsivity of 1284 A/W and a specific detectivity of 2.34×10^(13)cm Hz^(1/2)/W at a peak detection wavelength of~6.8 *** type-Ⅱ superlattice-based high-gain LWIR device shows the possibility of designing the high-performance gain-based LWIR photodetectors by implementing the band structure engineering approach.

关键词： heterojunction structure high

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Fully integrated on-chip rectennas for K-band applications using a novel tunnelling diode

Fully integrated on-chip rectennas for K-band applications u...

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Sensors and Communication Technologies in the 1 GHz to 10 THz Band 2024

作者： Walsh, Christopher Sadeghi, Mohammadreza Missous, M. Department of Electrical and Electronic Engineering University of Manchester ManchesterM13 9PL United Kingdom Advanced Hall Sensors Ltd. ManchesterM17 1RW United Kingdom

ISBN: (数字)9781510681156

ISBN: (纸本)9781510681149

Recent developments in the design of the epitaxial structure of an asymmetrical spacer layer tunnel (ASPAT) diode have included a quantum well next to the barrier. This leads to a substantially improved curvature coefficient due to a reduction in the leakage current, introducing yet further advantages over the standard ASPAT diode, which has temperature independence, zero bias operations, and a high dynamic range. This work has developed these diodes into a fully integrated miniature rectenna solution, which integrates an antenna, rectifier, and RC filter. This device targets an operating frequency of 26 GHz, where such a solution could see applications in wireless power transfer, energy harvesting, or signal detection. The current design uses a loop antenna, where the trace has been meandered to increase the electrical length whilst enabling the die size of the device to be reduced to 2x0.8 mm2. This size, whilst at mm-scale, enables an efficient antenna to be designed with a simulated gain of 2 dBi. Integrated into this design is a general voltage doubler circuit, consisting of a series capacitor, a shunt diode, and a series diode, with this circuit followed by an RC filter, a shunt capacitor and a resistor, integrated on-chip. The design includes bond pads allowing the device to be packaged in standard QFN packages or onto PCBs for testing. Measurements confirmed that these devices can detect a K-band signal, with a peak reading of 55.2 mV detected at 23.5 GHz. © 2024 SPIE.

关键词： Semiconductor quantum wells

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Measurement of refractive index and liquid diffusion coefficient based on focal plane imaging method 23

Measurement of refractive index and liquid diffusion coeffic...

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Conference on current developments in Lens design and optical engineering XXiiI Part of SPIE Optics and Photonics Conference

作者： Wei, Li Gao, Haifeng Zhou, Haitao Cheng, Dewen Beijing Inst Technol Sch Opt & Photon Beijing Engn Res Ctr Mixed Real & Adv Display Beijing 100081 Peoples R China Jiangxi Opt Lens Prod Qual Supervis & Inspect Ctr Shang Rao 334000 Peoples R China Future Opt Shang Rao Sci Res Inst Co Ltd Shang Rao 334000 Peoples R China

ISBN: (纸本)9781510654198;9781510654181

Liquid-core cylindrical lens (LCL) is glued together by two cylindrical lenses, translucent liquid with refractive index n is injected into the liquid core, based on focal plane imaging method, the refractive index n has a one-to-one dependence on the focal length f of the LCL, n= f(n). Two kind of LCL, symmetrical liquid-core cylindrical lens (SLCL) and asymmetrical liquid-core cylindrical lens (ALCL) had been designed and fabricated, the refractive index measurement accuracy is superior to 0.0002 RIU. Based on the refractive index spatial measurement capability of ALCL, the equivalent refractive index thin layer movement method for rapidly and accurately measuring the diffusion coefficient D under the infinite dilution condition was applied to measure an aqueous CaCl2 solution at temperature of 303 K, and the result D were simulated and verified by ray tracing method. Comparing with the traditional method, this method has the advantages of visualization of diffusion process, strong anti-interference capability, rapid measurement, which can be widely used in medical, chemical, biological, environmental protection or other fields.

关键词： Liquid-core cylindrical lens optical measurement refractive index liquid diffusion coefficient

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optical systems for future Ring Imaging Cherenkov detectors

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2023年 1055卷

作者： Cardinale, R. Petrolini, A. Univ Genoa I-16146 Genoa Italy INFN Sez Genova I-16146 Genoa Italy

optical systems for Ring Imaging Cherenkov (RICH) detectors have historically taken a variety of designs. Nowadays, technological developments allow more flexibility in the design and construction than was possible in the past, such as lightweight secondary mirrors that can be placed in the acceptance of an experiment, widespread use of non-spherical optical surfaces, flexible and fast tools for parametric optimisation of the optical systems before feeding into a full detector simulation. Within this context, the design of the LHCb RICH optical system for the current Run-3 data-taking of the LHC will be presented and compared to the parametric design of the proposed optics for the Upgrade ii for the future HL-LHC phase.

关键词： Ring imaging Cherenkov detector Particle identification High-energy physics Optics

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Developing a novel electro-optic scanner for potential micro display and head-mounted display application

Developing a novel electro-optic scanner for potential micro...

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Nano-, Bio-, Info-Tech Sensors, and Wearable Systems 2023

作者： Wang, Wei Chih Ghorapade, Vinayak Kalel, Sudarshan Estroff, Ben Chen, Chia Li Hsu, Yu Yang Institute of Nanoengineering and Microsystems National Tsing Hua University Taiwan Department of Power Mechanical Engineering National Tsing Hua University Taiwan Department of Mechanical Engineering University of Washington SeattleWA United States Department of Electrical & Computer Engineering University of Washington SeattleWA United States

ISBN: (纸本)9781510660779

Light beam deflectors and scanners have great potential in displays and microscopy for industrial and medical applications. A liquid crystal (LC) material that responds to external stimuli is a promising candidate for such applications. The goal of the proposed work is to create a miniature light scanning device without any moving parts using integrated electro-optic (EO) LC material. The design is based on changing the propagation direction of a light beam when it is incident to an electro-optic medium with a voltage-controlled index of refraction. The current design consists of two horizontal LC cell cascaded prisms (active Prism I and ii) for horizontal beam deflection and a vertical prism (passive) at the end of the horizontal stage for vertical beam deflection. In the present work, a mathematical model and simulation study is conducted on the proposed design to achieve 2D deflection of the beam (λ=632 nm). The optimized prism or apex angle of active prisms I and ii are 63 and 56.7 respectively, whereas the prism angle of the passive prism is 37.5 . With an incident beam angle (θ1) of 9 at the entry of prism I, maximum horizontal deflection of >36 and maximum vertical deflection of >13 is achieved through theoretical and simulation study. © 2023 SPIE.

关键词： Helmet mounted displays

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Machine Learning Based Alignment For LCLS-ii-HE Optics 6

Machine Learning Based Alignment For LCLS-II-HE Optics

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Advances in Computational Methods for X-Ray Optics VI 2023

作者： Mishra, Aashwin Brennan, Nicholas Huang, Tianyu Jaquith, Jason Yavaş, Hasan Seaberg, Matthew SLAC National Accelerator Laboratory Menlo ParkCA94025 United States

ISBN: (纸本)9781510666085

The hard X-ray instruments at the Linac Coherent Light Source are in the design phase for upgrades that will take full advantage of the high repetition rates that will become available with LCLS-ii-HE. The current X-ray Correlation Spectroscopy instrument will be converted to the Dynamic X-ray Scattering instrument, and will feature a meV-scale high-resolution monochromator at its front end with unprecedented coherent flux. With the new capability come many engineering and design challenges, not least of which is the sensitivity to long-term drift of the optics. With this in mind, we have estimated the system tolerance to angular drift and vibration for all the relevant optics (∼10 components) in terms of how the central energy out of the monochromator will be affected to inform the mechanical design. Additionally, we have started planning for methods to correct for such drifts using available (both invasive and non-invasive) X-ray beam diagnostics. In simulations, we have demonstrated the ability of trained Machine Learning models to correct misalignments to maintain the desired central energy and optical axis within the necessary tolerances. Additionally, we exhibit the use of Bayesian Optimization to minimize the impact of thermal deformations of crystals as well as beam alignment from scratch. The initial results are very promising and efforts to further extend this work are ongoing. © 2023 SPIE. All rights reserved.

关键词： Electrons

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Evaluation of a wavelet-based optical flow method for planar velocimetry using scalar fields

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EXPERIMENTS IN FLUIDS 2022年第3期63卷 1-16页

作者： Schmidt, B. E. Sutton, J. A. Case Western Reserve Univ 201 W 19th Ave Columbus OH 43210 USA

A wavelet-based optical flow velocimetry (wOFV) method is evaluated in the context of determining flow velocity from scalar images. A hierarchy of data sets are used to provide an assessment of the scalar-based methodology, including synthetic image pairs of passive scalar fields from 2D and 3D DNS sets and experimental data from a series of turbulent jets. For evaluation on the synthetic data, results are compared to other optical flow methods (using scalar images) found within the literature and correlation-based PIV using synthetic tracer particle images generated from the same DNS. For scalar-based velocimetry, there are two primary sources of error that do not occur for correlation-based PIV or when wOFV is applied to tracer particle-based images: (i) low occurrences (spatially isolated) of high-magnitude errors due to motion ambiguity resulting from poor local contrast in the scalar images and (ii) out-of-plane scalar flux. Overall, the application of the wOFV method to scalar images is less accurate than tracer particle-based approaches (correlation-based PIV or wOFV), but still yields reasonably accurate velocity estimations. The current scalar-based wOFV method compares very favorably to previous scalar image-based optical flow methods and may find utility in cases where it is undesirable or impossible to seed the flow with tracer particles. A parametric study is performed to determine experimental design parameters, including optimal conditions for spatial resolution (i.e., image contrast) and maximum inter-frame displacement. Data from a three-dimensional DNS is used to directly assess errors caused by scalar transport in the direction perpendicular to the imaging plane, which could be present in laser-based planar measurements. Finally, the scalar-based wOFV method is applied to experimental image sequences of passive scalar fields from a series of turbulent jets to serve as proof-of-concept. Initial results show that wOFV may be suitable for velocimetry

关键词： engineering Fluid Dynamics Fluid- and Aerodynamics engineering Thermodynamics Heat and Mass Transfer

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