Magnetic Toroidal Dipole Resonances for Efficient THz Generation in Dielectric Metasurfaces

IF 2.6 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Journal Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI:10.1109/JPHOT.2026.3663297

Davide Rocco;Olga Sergaeva;Luca Carletti;Andrea Tognazzi;Paolo Franceschini;Alfonso Carmelo Cino;Andrea Locatelli;Costantino De Angelis

引用次数: 0

Abstract

Nonlinear dielectric metasurfaces represent a rapidly advancing family of optical devices characterized by high nonlinear conversion efficiency with an ultrathin form factor. Here, we report on terahertz (THz) emission through difference-frequency generation (DFG) in an Aluminum Gallium Arsenide (AlGaAs) metasurface supporting magnetic toroidal dipolar resonances at the two pump wavelengths, which nonlinearly interact with each other. The simultaneous excitation of these high-Q resonances, together with the dispersive behavior of the nonlinear susceptibility, enables an exceptionally strong DFG response. Conversion efficiencies around 8 THz exceed those of an unstructured AlGaAs slab of the same thickness by over nine orders of magnitude. These results highlight the potential of DFG metasurfaces as compact and highly efficient platforms for THz generation.

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介电超表面中有效产生太赫兹的磁环向偶极子共振

非线性介电超表面是一种快速发展的光学器件，其特点是具有超薄的外形和高非线性转换效率。在这里，我们报告了通过差频产生（DFG）在砷化铝镓（AlGaAs）超表面中支持两个泵浦波长的磁环向偶极共振的太赫兹（THz）发射，这些共振彼此非线性相互作用。这些高q共振的同时激发，加上非线性磁化率的色散行为，使DFG响应异常强烈。8太赫兹左右的转换效率比相同厚度的非结构化AlGaAs板高出9个数量级以上。这些结果突出了DFG超表面作为太赫兹生成的紧凑和高效平台的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Journal ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

4.50

自引率

8.30%

发文量

489

审稿时长

1.4 months

期刊介绍： Breakthroughs in the generation of light and in its control and utilization have given rise to the field of Photonics, a rapidly expanding area of science and technology with major technological and economic impact. Photonics integrates quantum electronics and optics to accelerate progress in the generation of novel photon sources and in their utilization in emerging applications at the micro and nano scales spanning from the far-infrared/THz to the x-ray region of the electromagnetic spectrum. IEEE Photonics Journal is an online-only journal dedicated to the rapid disclosure of top-quality peer-reviewed research at the forefront of all areas of photonics. Contributions addressing issues ranging from fundamental understanding to emerging technologies and applications are within the scope of the Journal. The Journal includes topics in: Photon sources from far infrared to X-rays, Photonics materials and engineered photonic structures, Integrated optics and optoelectronic, Ultrafast, attosecond, high field and short wavelength photonics, Biophotonics, including DNA photonics, Nanophotonics, Magnetophotonics, Fundamentals of light propagation and interaction; nonlinear effects, Optical data storage, Fiber optics and optical communications devices, systems, and technologies, Micro Opto Electro Mechanical Systems (MOEMS), Microwave photonics, Optical Sensors.