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Indium bump array fabrication on small CMOS circuit for flip-chip bonding

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Journal of Semiconductors 2011年第11期32卷 148-151页

作者：黄寓洋张宇翔殷志珍崔国新刘惠春边历峰杨辉张耀辉 Suzhou institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences institute for microstructural sciences National Research Council

We demonstrate a novel method for indium bump fabrication on a small CMOS circuit chip that is to be flip-chip bonded with a GaAs/A1GaAs multiple quantum well spatial light modulator. A chip holder with a via hole is used to coat the photoresist for indium bump lift-off. The 1000 μm-wide photoresist edge bead around the circuit chip can be reduced to less than 500 μm, which ensures the integrity of the indium bump array. 64 - 64 indium arrays with 20 μm-high, 30 μm-diameter bumps are successfully formed on a 5 - 6.5 mm^2 CMOS chip.

关键词： flip-chip bonding indium bump array small-size

Polarized Light Microscopy and Spectroscopy of Individual Single-Walled Carbon Nanotubes

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Nano research 2011年第8期4卷 788-794页

作者： Jacques Lefebvre Paul Finnie institute for microstructural sciences National Research Council Ottawa Canada K IA 0R6

Polarized light microscopy （PLM） is used to image individual single-walled carbon nanotubes （SWNTs） suspended in air across a slit opening. The imaging contrast relies on the strong optical anisotropy typical of SWNTs. We combine PLM with a tunable light source to enable hyperspectral excitation spectroscopy and nanotube chirality assignment. Comparison with fluorescence microscopy and spectroscopy confirms the assignment made with PLM. This represents a versatile new approach to imaging SWNTs and related structures.

关键词： Carbon nanotube microscopy luminescence absorption polarization homodyne

High contrast ratio,high uniformity multiple quantum well spatial light modulators

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Journal of Semiconductors 2010年第3期31卷 62-65页

作者：黄寓洋刘惠春 Wasilewski Z R Buchanan M Laframboise S R 杨晨崔国新边历峰杨辉张耀辉 institute of Semiconductors Chinese Academy of Sciences Suzhou institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences institute for microstructural sciences National Research CouncilOttawa KIA 0R6Canada

Our latest research results on GaAs-A1GaAs multiple quantum well spatial light modulators are presented. The thickness uniformity of the epitaxial layers across the 3-inch wafer grown by our molecular beam epitaxy is better than 0.1% and the variation of cavity resonance wavelength within the wafer is only 0.9 nm. A contrast ratio （CR） of 102 by varying bias voltage from 0 to 6.7 V is achieved after fine tuning the cavity by etching an adjust layer. Both theoretical and experimental results demonstrate that incorporating an adjust layer is an effective tuning method for obtaining high CR.

关键词： spatial light modulator multiple quantum well uniformity contrast ratio adjust layer matching condition

Numerical simulation of a gradient-index fibre probe and its properties of light propagation

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Chinese Physics B 2011年第11期20卷 332-338页

作者：王驰毛幼馨唐智方臣于瀛洁齐博 Department of Precision Mechanical Engineering Shanghai University institute for microstructural sciences National Research Council Canada Key laboratory of Specialty Fiber Optics and Optical Access Network Shanghai University

In order to verify the properties of the light propagating through a gradient-index （GRIN） fibre probe for optical coherence tomography （OCT）, numerical simulation using the optical software GLAD is carried out. Firstly, the model of the GRIN fibre probe is presented, which is consisted of a single mode fibre （SMF）, a no-core fibre （NCF）, a GRIN fibre lens and an air path. Then, the software GLAD is adopted to numerically investigate how the lengths of the NCF and the GRIN fibre lens influence the performance of the Gaussian beam focusing through the GRIN fibre probe. The simulation results are well consistent with the experimental ones, showing that the GLAD based numerical simulation technique is an intuitive and effective tool for the verification of the properties of the light propagation. In this paper, we find that on the conditions of a constant GRIN fibre lens length of 0.1 mm and an NCF length of 0.36 mm, the working distance of the probe will be 0.75 mm and the focus spot size is 32 μm.

关键词： optical coherence tomography gradient-index fibre probe gradient-index lens GLAD

WAVELENGTH PROBING OPTICAL COHERENCE TOMOGRAPHY

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Journal of Innovative Optical Health sciences 2011年第1期4卷 79-88页

作者： SHOUDE CHANG YOUXIN MAO Imaging Devices Group institute for microstructural sciences national research council Canada Ottawa OntarioK1A 0R6 Canada

In swept-source optical coherence tomography(SSOCT),the swept-source stimulates system by a series of wavelengths in time sequence;a photo detector then collects all reflected/backscattered light from testing sample as the components of Fourier *** to the nature of the SSOCT,the processing in spectral domain can merge multiple swept-sources with different central wavelengths,which greatly increases the resolution of the OCT *** the wavelength probing OCT,a standard broadband SSOCT system is used to extract the internal structure of the sample,and another narrow band light can be used to probe the spectral feature of the sample at the probing wavelength.

关键词： Optical coherence tomography swept-source OCT spectral signal processing

Merging bound states in the continuum in an open acoustic resonator

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin Jia Artem S.Pilipchuk Sibo Huang Chen Shen Almas F.Sadreev Yong Li Andrey E.Miroshnichenko School of Physics and Electronic sciences East China Normal University institute of Acoustics Tongji University L.V.Kirensky institute of Physics Department of Mechanical Engineering Rowan University School of Engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and Friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

Electronic and optical properties of semiconductor and graphene quantum dots

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Frontiers of physics 2012年第3期7卷 328-352页

作者： Wei-dong Sheng Marek Korkusinski Alev Devrim Güçlü Michal Zielinski Pawel Potasz Eugene S.Kadantsev Oleksandr Voznyy Pawel Hawrylak institute of microstructural sciences National Research Council of CanadaOttawaCanada Department of Physics Fudan UniversityShanghai 200433China institute of Physics Nicalaus Copernicus University TorunPoland institute of Physics Wroclaw University of TechnologyWroclawPoland

Our recent work on the electronic and optical properties of semiconductor and graphene quan- tum dots is reviewed. For strained self-assembled InAs quantum dots on GaAs or InP substrate atomic positions and strain distribution are described using valence-force field approach and con- tinuous elasticity theory. The strain is coupled with the effective mass, k ~ p, effective bond-orbital and atomistic tight-binding models for the description of the conduction and valence band states. The single-particle states are used as input to the calculation of optical properties, with electron- electron interactions included via configuration interaction （CI） method. This methodology is used to describe multiexciton complexes in quantum dot lasers, and in particular the hidden symmetry as the underlying principle of multiexciton energy levels, manipulating emission from biexcitons for entangled photon pairs, and optical control and detection of electron spins using gates. The self-assembled quantum dots are compared with graphene quantum dots, one carbon atom-thick nanostructures. It is shown that the control of size, shape and character of the edge of graphene dots allows to manipulate simultaneously the electronic, optical, and magnetic properties in a single material system.

关键词： quantum dots electronic structure multiexciton graphene magnetism

An integrated approach to investigate climate-driven rockfall occurrence in high alpine slopes: the Bessanese glacial basin, Western Italian Alps

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Journal of Mountain Science 2020年第11期17卷 2591-2610页

作者： VIANI Cristina CHIARLE Marta PARANUNZIO Roberta MERLONE Andrea MUSACCHIO Chiara COPPA Graziano NIGRELLI Guido Department of Earth sciences University of Torino10125 TorinoItaly research institute for Geo-Hydrological Protection Italian National Research Council10135 TorinoItaly institute of Atmospheric sciences and Climate Italian National Research Council10133 TorinoItaly national institute of Metrological research 10135 TorinoItaly

Rockfalls are one of the most common instability processes in high *** represent a relevant issue,both for the risks they represent for(infra)structures and frequentation,and for their potential role as terrestrial indicators of climate *** study aims to contribute to the growing topic of the relationship between climate change and slope instability at the basin *** selected study area is the Bessanese glacial basin(Western Italian Alps)which,since 2016,has been specifically equipped,monitored and investigated for this *** order to provide a broader context for the interpretation of the recent rockfall events and associated climate conditions,a cross-temporal and integrated approach has been *** this purpose,geomorphological investigations(last 100 years),local climate(last 30 years)and near-surface rock/air temperatures analyses,have been carried *** research outcomes show that rockfalls occurred in two different geomorphological positions:on rock slopes in permafrost condition,facing from NW to NE and/or along the glacier margins,on rock slopes uncovered by the ice in the last *** thaw of the active layer and/or glacier debutressing can be deemed responsible for slope failure *** regard to timing,almost all dated rock falls occurred in *** the July events,initiation may have been caused by a combination of rapid snow melt and enhanced seasonal thaw of the active layer due to anomalous high temperatures,and *** events are,instead,associated with a significant positive temperature anomaly on the quarterly scale,and they can be ascribed to the rapid and/or in depth thaw of the permafrost active *** to our findings,we can expect that in the Bessanese glacierized basin,as in similar high mountain areas,climate change will cause an increase of slope instability in the *** fasten knowledge deepening,we highlight the need for a growth of a network of high elevation

关键词： Rockfalls Climate change Air and rock temperature Periglacial environment Western Italian Alps

Application of Statistical Tools for Data Analysis and Interpretation in Rice Plant Pathology

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Rice science 2018年第1期25卷 1-18页

作者： Parsuram NAYAK Arup Kumar MUKHERJEE Elssa PANDIT Sharat Kumar PRADHAN Indian council of Agricultural research National Rice Research Institute

There has been a significant advancement in the application of statistical tools in plant pathology during the past four decades. These tools include multivariate analysis of disease dynamics involving principal component analysis, cluster analysis, factor analysis, pattern analysis, discriminant analysis, multivariate analysis of variance, correspondence analysis, canonical correlation analysis, redundancy analysis, genetic diversity analysis, and stability analysis, which involve in joint regression, additive main effects and multiplicative interactions, and genotype-by-environment interaction biplot analysis. The advanced statistical tools, such as non-parametric analysis of disease association, meta-analysis, Bayesian analysis, and decision theory, take an important place in analysis of disease dynamics. Disease forecasting methods by simulation models for plant diseases have a great potentiality in practical disease control strategies. Common mathematical tools such as monomolecular, exponential, logistic, Gompertz and linked differential equations take an important place in growth curve analysis of disease epidemics. The highly informative means of displaying a range of numerical data through construction of box and whisker plots has been suggested. The probable applications of recent advanced tools of linear and non-linear mixed models like the linear mixed model, generalized linear model, and generalized linear mixed models have been presented. The most recent technologies such as micro-array analysis, though cost effective, provide estimates of gene expressions for thousands of genes simultaneously and need attention by the molecular biologists. Some of these advanced tools can be well applied in different branches of rice research, including crop improvement, crop production, crop protection, social sciences as well as agricultural engineering. The rice research scientists should take advantage of these new opportunities adequately in adoption of the new h

关键词： statistical tool plant pathology data analysis multivariate analysis non-parametric analysis micro-array analysis decision theory plant disease epidemics rice