Pancaldi Matteo, Vavassori Paolo, Bonetti Stefano
Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, 30172 Venezia Mestre, Italy.
CIC nanoGUNE BRTA, 20018 Donostia-San Sebastián, Spain.
Nanophotonics. 2024 Feb 2;13(10):1891-1898. doi: 10.1515/nanoph-2023-0801. eCollection 2024 Apr.
We describe the design of two types of metamaterials aimed at enhancing terahertz field pulses that can be used to control the magnetic state in condensed matter systems. The first structure is a so-called "dragonfly" antenna, able to realize a five-fold enhancement of the impinging terahertz magnetic field, while preserving its broadband features. For currently available state-of-the-art table top sources, this leads to peak magnetic fields exceeding 1 T. The second structure is an octopole antenna aimed at enhancing a circularly-polarized terahertz electric field, while preserving its polarization state. We obtain a five-fold enhancement of the electric field, hence expected to exceed the 1 MV/cm peak amplitude. Both our structures can be readily fabricated on top of virtually any material.
我们描述了两种超材料的设计，旨在增强太赫兹场脉冲，这些脉冲可用于控制凝聚态物质系统中的磁态。第一种结构是所谓的“蜻蜓”天线，能够在保持其宽带特性的同时，将入射太赫兹磁场增强五倍。对于目前可用的最先进的桌面源，这导致峰值磁场超过1 T。第二种结构是八极天线，旨在增强圆极化太赫兹电场，同时保持其极化状态。我们实现了电场增强五倍，因此预计峰值幅度将超过1 MV/cm。我们的两种结构都可以很容易地在几乎任何材料上制造。
