The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation)

M. Scalora, C. Cojocaru, J. Trull, M. A. Vincenti, D. Ceglia, M. Bloemer, N. Akozbek, J. Haus, R. Vilaseca, C. Angelis
{"title":"The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation)","authors":"M. Scalora, C. Cojocaru, J. Trull, M. A. Vincenti, D. Ceglia, M. Bloemer, N. Akozbek, J. Haus, R. Vilaseca, C. Angelis","doi":"10.1117/12.2320704","DOIUrl":null,"url":null,"abstract":"We discuss a dynamical model of harmonic generation that arises from surfaces that demarcate two different metals or conductors, or the electron cloud that spills outside a simple metal surface and the interior bulk, having different electron densities, for example a noble metal such as gold, and indium tin oxide (ITO). While in general two adjacent materials may contain free and bound charges that determine their respective dielectric constants, the transition region may be characterized by a large discontinuity in the free electron density, , epsilon-near-zero conditions, or multiple, nested plasmonic resonances. For example, , while the free-electron cloud that spills outside a noble metal surface decreases as a function of position from the hard ionic surface. These discrepancies lead to the prediction that the angular dependence of second harmonic generation (SHG) from a simple planar structure is direction-dependent, and highlights the sensitivity of both SHG and third harmonic generation to the makeup of the surface and what surrounds it. Our calculations also suggest that the nonlinear optical analysis of more complicated, hybrid structures, such as metal/oxide nanoantennas or metasurfaces, should always be performed by including effects that are generally overlooked, such as nonlocal effects (viscosity and pressure); the presence of linear and nonlinear quantum tunneling currents in the nano- and sub nano-gaps between the nanoantenna and embedded nanoparticles; linear and nonlinear contributions of bound (inner-core) electrons to the dielectric constant.","PeriodicalId":346327,"journal":{"name":"Active Photonic Platforms X","volume":"10 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Active Photonic Platforms X","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1117/12.2320704","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

We discuss a dynamical model of harmonic generation that arises from surfaces that demarcate two different metals or conductors, or the electron cloud that spills outside a simple metal surface and the interior bulk, having different electron densities, for example a noble metal such as gold, and indium tin oxide (ITO). While in general two adjacent materials may contain free and bound charges that determine their respective dielectric constants, the transition region may be characterized by a large discontinuity in the free electron density, , epsilon-near-zero conditions, or multiple, nested plasmonic resonances. For example, , while the free-electron cloud that spills outside a noble metal surface decreases as a function of position from the hard ionic surface. These discrepancies lead to the prediction that the angular dependence of second harmonic generation (SHG) from a simple planar structure is direction-dependent, and highlights the sensitivity of both SHG and third harmonic generation to the makeup of the surface and what surrounds it. Our calculations also suggest that the nonlinear optical analysis of more complicated, hybrid structures, such as metal/oxide nanoantennas or metasurfaces, should always be performed by including effects that are generally overlooked, such as nonlocal effects (viscosity and pressure); the presence of linear and nonlinear quantum tunneling currents in the nano- and sub nano-gaps between the nanoantenna and embedded nanoparticles; linear and nonlinear contributions of bound (inner-core) electrons to the dielectric constant.
不连续自由电子密度在金属表面和金属/氧化物边界产生谐波中的作用(会议报告)
我们讨论了谐波产生的动力学模型,谐波产生产生于划分两种不同金属或导体的表面,或者在具有不同电子密度的简单金属表面和内部体外溢出的电子云,例如金等贵金属和氧化铟锡(ITO)。虽然通常两个相邻的材料可能包含决定其各自介电常数的自由和束缚电荷,但过渡区域的特征可能是自由电子密度、epsilon-near-zero条件或多个嵌套等离子体共振中的大不连续。例如,当溅落在贵金属表面外的自由电子云随着离硬离子表面位置的变化而减少时。这些差异导致预测,从一个简单的平面结构产生的二次谐波(SHG)的角依赖是方向依赖的,并强调了二次谐波和第三次谐波产生对表面组成及其周围环境的敏感性。我们的计算还表明,对更复杂的混合结构(如金属/氧化物纳米天线或超表面)进行非线性光学分析时,应该始终包括通常被忽视的效应,如非局部效应(粘度和压力);在纳米天线和嵌入的纳米颗粒之间的纳米和亚纳米间隙中存在线性和非线性量子隧道电流;束缚(内核)电子对介电常数的线性和非线性贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信