Ultra-fast transient plasmonics using transparent conductive oxides
Ultra-fast transient plasmonics using transparent conductive oxides
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DOI：
10.1088/2040-8986/aa9d01
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发表时间：
2018-02-01
影响因子：
2.1
通讯作者：
Carnemolla, Enrico G.
中科院分区：
文献类型：
--
作者：
Ferrera, Marcello;Carnemolla, Enrico G.
在过去十年中，基于等离子体和超材料的应用通过允许深亚波长限制和完全控制光学环境的有效介电常数和磁导率，彻底改变了集成光子学领域。然而，尽管已经通过实验证明了许多显著的原理证明，但仍然存在一些关键问题，阻止了纳米光子技术的广泛应用。在这些基本的限制，我们提醒大的欧姆损耗，与半导体行业标准的不兼容性，并大大降低了动态可调谐性的光学性能。在这篇文章中，在全介电纳米光子学这一新兴领域的大背景下，我们介绍了我们最近对透明导电氧化物（TCO）中大光学非线性研究的进展，并概述了使用基于TCO的技术的最相关和最新的实验成果。然而，必须强调的是，本文并不是一份综述文件，而是一份有着广泛导言的原创性著作。我们的工作在于在高折射率对比度系统之间的中间的一种“混合”区域，其行为是很好地描述了通过应用米氏散射理论，和标准的等离子体元件，其中光学模式起源于电磁耦合与电子等离子体在金属-电介质界面。除了保持在等离子体技术的背景下，并保留所有的基本特性，促进了等离子体的成功摆在首位，我们的策略有额外的优势，允许大和超快速的可调性的有效复折射率通过访问在电信波长的散装材料的折射率接近零制度。
During the last decade, plasmonic-and metamaterial-based applications have revolutionized the field of integrated photonics by allowing for deep subwavelength confinement and full control over the effective permittivity and permeability of the optical environment. However, despite the numerous remarkable proofs of principle that have been experimentally demonstrated, few key issues remain preventing a widespread of nanophotonic technologies. Among these fundamental limitations, we remind the large ohmic losses, incompatibility with semiconductor industry standards, and largely reduced dynamic tunability of the optical properties. In this article, in the larger context of the new emerging field of all-dielectric nanophotonics, we present our recent progresses towards the study of large optical nonlinearities in transparent conducting oxides (TCOs) also giving a general overview of the most relevant and recent experimental attainments using TCO-based technology. However, it is important to underline that the present article does not represent a review paper but rather an original work with a broad introduction. Our work lays in a sort of 'hybrid' zone in the middle between high index contrast systems, whose behaviour is well described by applying Mie scattering theory, and standard plasmonic elements where optical modes originate from the electromagnetic coupling with the electronic plasma at the metal-todielectric interface. Beside remaining in the context of plasmonic technologies and retaining all the fundamental peculiarities that promoted the success of plasmonics in the first place, our strategy has the additional advantage to allow for large and ultra-fast tunability of the effective complex refractive index by accessing the index-near-zero regime in bulk materials at telecom wavelength.