International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)最新文献_第8页

Understanding methods to determine energy levels of quantum dot films for device integration 了解确定用于器件集成的量子点薄膜能级的方法

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2631667

Tom Nakotte, Simran Singh, Anna M. Hiszpanksi

引用次数: 0

Nano-Raman spectral imaging of localized vibrations in two-dimensional systems 二维系统局部振动的纳米拉曼光谱成像

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2633265

A. Jorio, Cassiano Rabelo, R. Nadas, Hudson Miranda, T. Vasconcelos, B. Archanjo, A. Gadelha, L. G. Cançado

引用次数: 0

Hyperbolic metamaterials for large-area Surface-Enhanced Raman Scattering (SERS) sensing 用于大面积表面增强拉曼散射(SERS)传感的双曲型超材料

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2633267

Melisa Ekin Gulseren, L. Domulevicz, J. Hihath, J. S. Gómez-Díaz

{"title":"Hyperbolic metamaterials for large-area Surface-Enhanced Raman Scattering (SERS) sensing","authors":"Melisa Ekin Gulseren, L. Domulevicz, J. Hihath, J. S. Gómez-Díaz","doi":"10.1117/12.2633267","DOIUrl":"https://doi.org/10.1117/12.2633267","url":null,"abstract":"Typical surface-enhanced Raman scattering (SERS) approaches rely on localized surface plasmon resonances that provide a significant enhancement of the localized electric field. Unfortunately, this technique faces challenges in terms of repeatability, which appears due to the strong dependence of the field enhancement on the surface roughness and the presence of hot-spots in nanostructures; and adequate excitation, as the laser beam must be tuned at a very specific wavelength that corresponds to the resonant frequency of the system. Hyperbolic metamaterials (HMTMs), a type of composite materials whose effective permittivity changes as a function of the electric field polarization, can effectively address these challenges because they support bulk and surface hyperbolic modes able to drastically boost the local fields over a broadband portion of the electromagnetic spectrum. In fact, the frequency response of these artificial materials can be manipulated by adjusting the system composing materials and filling ratios. This work aims to explore the potential of HMTMs to enhance the SERS of molecules located nearby and to address some of the challenges faced by common SERS platforms. To this purpose, we focus on Au/SiO2 HMTMs stacks that exhibit a hyperbolic dispersion for wavelengths larger than ~580 nm. A prototype has been fabricated and characterized using TEM and ellipsometry measurements. Power-dependent SERS measurements were obtained for a monolayer of biphenyl-4,4’-dithiol (BPDT) molecules self-assembled onto the HMTM surface and a gold-based control sample. HMTMs provide repeatable SERS detection with low laser powers <900µW and integration times <97ms (~30X and ~100X lower than control, respectively) over a large surface area, exhibiting a performance like complex TERS systems.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"61 1","pages":"1220305 - 1220305-6"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86084736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Realisation of large-scale photonic spiking hardware system 大规模光子脉冲硬件系统的实现

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2633530

Ria Talukder, X. Porte, D. Brunner

引用次数: 0

Coupling between modulated Mie scattering and photoacoustic signal generation in optically trapped, single aerosol particles 光捕获的单个气溶胶粒子中调制Mie散射和光声信号产生之间的耦合

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2633423

Michael J Gleichweit, Mercede A. Mohajer, Dominique Borgeaud, Matus E. Diveky, G. David, R. Signorell

{"title":"Coupling between modulated Mie scattering and photoacoustic signal generation in optically trapped, single aerosol particles","authors":"Michael J Gleichweit, Mercede A. Mohajer, Dominique Borgeaud, Matus E. Diveky, G. David, R. Signorell","doi":"10.1117/12.2633423","DOIUrl":"https://doi.org/10.1117/12.2633423","url":null,"abstract":"Photoacoustic spectroscopy and photothermal spectroscopy are two common methods to probe aerosol particle absorption coefficients and can be performed both on aerosol ensembles and on the single particle level. With photothermal spectroscopy typically changes in the particle’s light scattering pattern upon heating or cooling are observed with photo-diodes or cameras. In photoacoustic spectroscopy, the acoustic response to periodic light absorption is recorded e.g. with a microphone. Although both methods are closely related through their excitation process, the detection pathways are quintessentially different. In our single particle optical trapping setup, however, we observe a previously unnoticeable, unidirectional coupling between modulated Mie scattering (result of the photothermal effect) and photoacoustic spectroscopy. The coupling manifests itself via differently shaped, sudden features in the acoustic signal. Our analysis suggests a non-trivial interaction between light scattering of single, optically trapped particles and the photoacoustic signal generation based on interactions of light with the acoustic resonator’s walls. Measurements over several trapping powers and photoacoustic excitation powers support this conclusion. How the coupling manifests itself, such as shape and strength, can be conclusively explained by the structure of the particle’s momentary phase function (scattering intensity) calculated by classical Mie theory. This allows us to formulate conditions to either utilise or minimise the coupling effects in future experiments.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"87 1","pages":"1219805 - 1219805-13"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84904831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Controlling spin and valley hall effect in monolayer WSe2 at elevated temperatures 高温下控制单层WSe2的自旋和谷霍尔效应

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2633913

Xintong Li, Zhida Liu, Yihan Liu, Suyogya Karki, Xiaoqin Li, D. Akinwande, J. Incorvia

{"title":"Controlling spin and valley hall effect in monolayer WSe2 at elevated temperatures","authors":"Xintong Li, Zhida Liu, Yihan Liu, Suyogya Karki, Xiaoqin Li, D. Akinwande, J. Incorvia","doi":"10.1117/12.2633913","DOIUrl":"https://doi.org/10.1117/12.2633913","url":null,"abstract":"The spin and valley physics in 2-dimensional van der Waals materials provides a unique platform for novel applications in spintronics and valleytronics. 2H phase transition metal dichalcogenides (TMD) monolayers possesses broken inversion symmetry and strong spin-orbit coupling, leading to a coupled spin and valley physics that makes them better candidates for these applications. For practical device applications, spin and valley Hall effect (SVHE) is a good way of charge to spin and charge to valley conversion, making the electrical generation of spin and valley polarization possible. While SVHE has been observed via optical measurements at cryotemperatures below 30 K, the behavior at elevated temperatures and thorough understanding of the data are still lacking. In this work we conduct spatial Kerr rotation (KR) measurements on monolayer tungsten diselenide (WSe2) field effect transistors and study the electrical control and temperature dependence of SVHE. We image the distribution of the spin and valley polarization directly and find clear evidence of the spin and valley accumulation at the edges. We show that the SVHE can be electrically modulated by the gate and drain bias, and the polarization persists at elevated temperatures. We then conduct four-port electrical test reflection spectra measurement and use a drift-diffusion model to interpret the data and extract key parameters. A lower-bound spin/valley lifetime is predicted of 40 ns and a mean free path of 240 nm below 90 K. The spin/valley polarization on the edge is calculated to be ~4% at 45 K. WSe2-on-hBN samples are prepared as well, and the KR measurements on these samples are discussed.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"46 1","pages":"1220507 - 1220507-6"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73049530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconfigurable and programmable optical devices with phase change materials Sb2S3 and Sb2Se3 采用Sb2S3和Sb2Se3相变材料的可重构和可编程光器件

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2633641

W. Jia, R. Menon, B. Sensale‐Rodriguez

引用次数: 1

Solid-state laser refrigeration of core-shell polystyrene microspheres 核壳聚苯乙烯微球的固体激光制冷

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2635908

Rachel E. Gariepy, Xiaojing Xia, R. G. Felsted, Ayelet Teitelbom, E. Chan, P. Pauzauskie

{"title":"Solid-state laser refrigeration of core-shell polystyrene microspheres","authors":"Rachel E. Gariepy, Xiaojing Xia, R. G. Felsted, Ayelet Teitelbom, E. Chan, P. Pauzauskie","doi":"10.1117/12.2635908","DOIUrl":"https://doi.org/10.1117/12.2635908","url":null,"abstract":"Microlaser designs based on the coupling of whispering gallery modes (WGMs) with the upconversion processes which take place within lanthanide-doped nanoparticles (UCNPs) have been demonstrated and shown to have many valuable qualities, such as high Q factors and low lasing thresholds. One obstacle that these microlaser designs still face is the challenges caused by photothermal heating of the gain medium, which could be solved through the design of a radiation balanced microlaser. In this work, WGM microresonators composed of 5 μm diameter polystyrene spheres are fabricated with a layer of Yb3+-doped NaYF4 UCNPs in order to test if the anti-Stokes cooling properties of the UCNPs can cool the microresonator and its environment under laser irradiation. We find via calibrated mean fluorescence spectroscopy that the UCNPs can cool their local environment by as much as 23 °C and significantly reduce the heating of the aqueous environment surrounding the microresonator, showing promise for inclusion in a design for a radiation balanced microlaser.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"44 1","pages":"121980A - 121980A-4"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74536823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct color printing on Ag:TiO2 thin films induced by nanosecond laser pulses 纳秒激光脉冲诱导Ag:TiO2薄膜直接彩色印刷

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2632435

Van Doan Le, Balint Eles, N. Dalloz, Manuel A. Flores Figueroa, F. Vocanson, Y. Lefkir, N. Destouches

{"title":"Direct color printing on Ag:TiO2 thin films induced by nanosecond laser pulses","authors":"Van Doan Le, Balint Eles, N. Dalloz, Manuel A. Flores Figueroa, F. Vocanson, Y. Lefkir, N. Destouches","doi":"10.1117/12.2632435","DOIUrl":"https://doi.org/10.1117/12.2632435","url":null,"abstract":"Laser can be an effective tool to modify materials at the nanoscale in order to achieve desired optical properties. When dealing with metal-dielectric nanocomposite thin films, different mechanisms can be triggered by laser on large areas to control the statistical properties of these materials. Nanoparticles can be reshaped, resized and ordered according to self-organization mechanisms that set over micrometer wide areas. The dielectric crystal phase and film thickness can be changed upon laser-induced temperature rise. These mechanisms lead to changes in the optical properties of the films. Here, we investigate the structural changes that a Ag:TiO2 nanocomposite thin film undergoes under nanosecond laser scanning and their resulting optical properties. We especially focus on the color properties in different modes of observation such as reflection and diffraction. The colors originate from combination of absorption by the localized surface plasmon resonance of metallic nanoparticles, diffraction by the nanoparticles assemblies and interference between the incident, reflected and guided waves, the latter being excited by scattering on the nanoparticles. The morphological characterizations unveil the role of nanoparticle size, density and arrangement on the transition from a diffractive to a dichroic behavior. A full color image is also drawn to demonstrate the potential of the technique in industrial applications ranging from design, coloration to information storage and data security.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"122 1","pages":"1220207 - 1220207-6"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83497580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoexcitation of C60-WSe2 hybrids for optical sensing C60-WSe2杂化物用于光传感的光激发

International Conference on Nanoscience, Engineering and Technology (ICONSET 2011) Pub Date : 2022-10-03 DOI: 10.1117/12.2632594

K. Jayanand, Silvino P. Bastos, A. Kaul

{"title":"Photoexcitation of C60-WSe2 hybrids for optical sensing","authors":"K. Jayanand, Silvino P. Bastos, A. Kaul","doi":"10.1117/12.2632594","DOIUrl":"https://doi.org/10.1117/12.2632594","url":null,"abstract":"Monolayers of transition metal dichalcogenides (TMDCs) have caught the interest of post-silicon electronics and optoelectronics researchers due to their exceptional electronic and optoelectronic properties which stem from their unique two-dimensional (2D) layered structure. In recent years, there has been a focus on exploring van der Waals (vdW) heterojunctions with TMDCs, including with lower dimensionality materials such as zero-dimensional (0D) systems. Integrating 0D-2D assemblies together provides an opportunity to configure a diverse array of material stacks towards optoelectronics and electronics applications. In this study, we synthesized 0D-2D vdW heterostructure by spin coating C60 molecules on halide-assisted-low-pressure chemical-vapor-deposition (HA-LPCVD) produced monolayer WSe2 flakes. Raman and photoluminescence spectroscopy allowed us to assess the charge carrier exchange at the vdW interface. We found that after C60 deposition, the photodetector figures of merit for WSe2 − C60 hybrids improved, and investigations were conducted as a function of illumination power. Our studies reveal that WSe2 − C60 hybrid system is an appealing choice for next generation optical sensing devices.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"24 1","pages":"1220006 - 1220006-7"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87857890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0