【直播】纳米光学与纳米光电子学线上系列讲座
直播二维码
本次讲座由上海大学中欧工程技术学院主办，上海大学量子与分子结构国际中心协办，于2021年10月26日15:00开始，授权蔻享学术进行网络直播。
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日程详情
| Time | Speaker/Title |
| 15:00 | Bruno Grandidier Semiconductor heterostructures grown by selective area epitaxy: properties and unique application |
| 15:40 | Renaud Bachelot Advanced hybrid plasmonic nano-emitters using smart photopolymer |
| 16:20 | Christophe Delerue Optical absorption quantization in thin films of semiconductors |
| 17:00 | Gaëtan Lévêque Fano profiles and strong interactions in coupled plasmonic nanostructures |
| 17:40 | Jérôme Plain Towards sustainable materials for Nano-optics |
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专家简介及报告详情
Semiconductor heterostructures grown by selective area epitaxy: properties and unique application
Bruno Grandidier
Univ. Lille, CNRS, Centrale Lille, ISEN-YNCREA, Univ. Valenciennes, UMR 8520-IEMN, 59000 Lille, France
Selective area epitaxy of semiconductor heterostructures takes place on a crystal inside predefined patterns obtained by lithography inside an oxide mask. This technique allows the growth of complex structures which are highly scalable, such as InGaAs nanowire networks or PbS nanoplatelets grown both on InP substrates. For the first type of nanostructures, we will show how we can model the growth and explain the overall morphology of the nanowires by providing the effective diffusion length of group III elements. Then, we will address the band alignment between the InGaAs nanowires and the InP buffer layer using multi-tip scanning tunneling microscopy. We will show how two-point probe tunneling spectroscopy provides a direct access to the band offsets. In a second part, we will examine the electrical properties of the PbS/InP heterointerface as a function of the chemical treatment of the InP surface prior to the growth of the PbS nanoplatelets. In case of untreated InP (001) surfaces, we will demonstrate single electron tunneling as well as short and long-term memory effects, which are caused by the presence of interfacial traps. By extrapolating the experimental data in the single electron tunneling regime, we will model synaptic operations and assess the potential of PbS/InP heterostructures for neuromorphic computing.
专家简介：
Bruno Grandidier，法国国家科研中心主任研究员，法国微电子纳米技术研究所纳米结构物理与量子器件课题组负责人，法国高等电子与数字工程师学院物理系主任，是低维半导体纳米结构与界面物理以及纳米器件研究领域的国际知名学者。目前共发表学术论文130篇，近年来作为通讯作者在Science，PRL，Nanoletters等顶级杂志上发表论文10余篇，被引用3600余次，H因子：35，迄今共培养博士生15名。主持及参与包括欧盟玛丽居里创新计划，法国卓越研究设备计划，法国国家科研署（ANR）等15项科研项目。
Advanced hybrid plasmonic nano-emitters using smart photopolymer
Renaud Bachelot
Light, Nanomaterials, Nanotechnologies (L2n), CNRS, Université de Technologie de Troyes, France
The integration of nano-emitters into plasmonic devices with spatial control and nanometer precision has become a great challenge. In this paper, we report on the use of a smart polymer for selectively immobilizing nano-emitters on specific preselected sites of gold nanocubes (GNC). The cunning use of the polymer is twofold. First, it records both the selected site and the future emitters-GNC distance through plasmonassistedphotopolymerization. Second, because the polymer is chemically functionalized, it makes it possible to attach the nano-emitters right at the preselected polymerized sites which subsequently “recognize” the nano-emitters to get attached. Since the resulting active medium is a spatial memory of specific plasmonic modes, it is anisotropic, making the hybrid nanosources sensitive to light polarization. The ability to adjust their statistical average lifetime by controlling the thickness of the nanopolymer is demonstrated on two kinds of nano-emitters coupled to GNC: doped polystyrene nanospheres and semiconductor colloidal quantum dots.
专家简介：
Renaud Bachelot，法国特鲁瓦理工大学（UTT）特级教授，特鲁瓦理工大学纳米光学重点实验室主任，是纳米光学和光子器件研究领域的国际知名学者。目前已发表学术论文160余篇，被引用：5300余次，H因子：41。另发表著作8本，专利4项，国际会议邀请报告20余次，担任多个国际会议的主席。主持10多项欧盟和法国国家级的科研项目，培养博士毕业生20余名。担任或曾担任法国特鲁瓦理工大学学术委员会副主席和法国香槟省大学董事会成员、法国物理协会会士等重要职位，曾在新加坡南洋理工大学和美国Argonne国家实验室担任客座教授。
Optical absorption quantization in thin films of semiconductors
Christophe Delerue
Université de Lille, CNRS, Centrale Lille, Université Polytechnique Hauts-de-France, Junia, UMR 8520 - IEMN, F-59000 Lille, France.
It is well known that, over a wide range of wavelengths, a graphene sheet absorbs 2.3% of the light passing through it. This value is directly related to the fine structure constant, which can be interpreted by the very particular band structure of this material. Remarkably, it has been shown experimentally that thin InAs films exhibit an absorption spectrum characterized by steps that can also be related to the fine structure constant. We present numerical simulations (TB, KP) showing that this phenomenon is very robust and is obtained for a very large number of semiconductor materials. We complement this work with analytical calculations to understand the physical origin of this behavior. The comparison with graphene is discussed.
专家简介：
Christophe Delerue，法国国家科研中心（CNRS）主任研究员，现任法国微电子与纳米技术研究所（IEMN）副所长，法国知名理论物理学家。他的主要研究方向是低维纳米结构的理论物理和数字模拟研究。迄今共发表200余篇学术论文，被引用 16000 余次，H因子：58，撰写专著10本，国际会议邀请报告80余次，培养博士生20余名。曾经获得2007年法国物理学会Ancel Prize和2012年Bull Joseph Fourier prize。担任Europhysics Letters期刊的主编，法国物理学会会士以及法国科技部专家。
Fano profiles and strong interactions in coupled plasmonic nanostructures
Gaëtan Lévêque
Université de Lille, CNRS, Centrale Lille, Université Polytechnique Hauts-de-France, Junia, UMR 8520 - IEMN, F-59000 Lille, France
Fano profiles in nanophotonics arise from the interference between a dark (narrow) and a bright (wide) mode. For example, an assymetric interference pattern is observed in the scattering spectrum of a metal nanorod located within sub-wavelength distance of a metal nanodisk. The nanorod dark mode, whose excitation under planewave excitation is forbidden, is coupled to the incident light through the near-filed generated by the nanodisk dipolar plasmon mode. When the interparticle distance decreases, strong coupling occurs, leading to the formation of hybridized plasmonic modes. We present a numerical investigation of the physics of this coupling, using finite elements method, by computing scattering and absorption spectra together with quasi normal modes, and compare those results to expreimental realizations performed in IEMN. Some perspective on the use of those structures are finally given.
专家简介：
Gaétan Lévêque，法国微电子纳米技术研究所/法国里尔大学副教授，研究领域为纳米光学的模拟分析与数值计算。发表学术论文60余篇，国际会议邀请报告13次，H因子22，主持与参与多项法国国家级科研项目。
Towards sustainable materials for Nano-optics
Jérôme Plain
Light, Nanomaterials, Nanotechnologies (L2n), CNRS, Université de Technologie de Troyes, France
For more than twenty years, noble metal nanoparticles have been of first interest due to their varied and complex optical properties. These properties are mainly governed by collective oscillations of conduction electrons called "plasmons". In particular, the excitation of the plasmon resonance by optical fields leads to a local exaltation of the electromagnetic field close to the nanoparticle. Such very intense nanosource paves the way for numerous applications: controlling, manipulating and amplifying the light at the nanoscale. Nevertheless, if numerous applications have already been developed, the finite stocks of Au and Ag impose us to question some material issues. Is that possible to find abundant materials presenting similar optical properties in order to replace gold and silver?
Very recently, new materials have been proposed as suitable materials to tackle emerging applications of nano-photonics, e.g. high-temperature applications, nanochemistry, sensing, or active plasmonics where gold and silver do not possess all the required properties, such as hightemperature sustainability, or catalytic activity. For these reasons, gold and silver are currently reducing their predominance in plasmonics to the benefit of other metals, metal oxides and dielectrics that constitute a new emerging branch of research. Following this burgeoning variety of optical nanomaterials, it becomes useful to conduct a comprehensive and comparative study in order to clearly establish the relative efficiencies of these new materials.
In this talk, I will first present all the nanofabrication techniques developed in our group to obtain nanostructures made from materials chosen because of their abundance on earth and optical properties. In this context, I will discuss on the emerging materials and try to present the advantages of different materials like aluminum, silicon, or nitrides.
专家简介：
Jérôme Plain，法国特鲁瓦技术大学教授，副校长，研究领域为金属纳米材料制备与纳米光学表征，在Nano letters 、ACS nano等期刊上发表研究论文100多篇，被引次数为3700余次，H因子为35。在国际高水平学术会议上做受邀报告总计20余次，主持和参与过多项欧盟和法国国家级的科研项目，担任多个国际会议的主席。
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