Zeng Jinwei, Albooyeh Mohammad, Rajaei Mohsen, Sifat Abid Anjum, Potma Eric O, Wickramasinghe H Kumar, Capolino Filippo
Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA.
Sci Adv. 2022 Nov 11;8(45):eadd0233. doi: 10.1126/sciadv.add0233. Epub 2022 Nov 9.
We demonstrate experimentally the detection of magnetic force at optical frequencies, defined as the dipolar Lorentz force exerted on a photoinduced magnetic dipole excited by the magnetic component of light. Historically, this magnetic force has been considered elusive since, at optical frequencies, magnetic effects are usually overshadowed by the interaction of the electric component of light, making it difficult to recognize the direct magnetic force from the dominant electric forces. To overcome this challenge, we develop a photoinduced magnetic force characterization method that exploits a magnetic nanoprobe under structured light illumination. This approach enables the direct detection of the magnetic force, revealing the magnetic nearfield distribution at the nanoscale, while maximally suppressing its electric counterpart. The proposed method opens up new avenues for nanoscopy based on optical magnetic contrast, offering a research tool for all-optical spin control and optomagnetic manipulation of matter at the nanoscale.
我们通过实验证明了在光频下对磁力的检测，该磁力定义为作用于由光的磁分量激发的光致磁偶极子上的偶极洛伦兹力。从历史上看，这种磁力一直被认为难以捉摸，因为在光频下，磁效应通常会被光的电分量的相互作用所掩盖，使得很难从占主导地位的电力中识别出直接的磁力。为了克服这一挑战，我们开发了一种光致磁力表征方法，该方法利用结构化光照射下的磁性纳米探针。这种方法能够直接检测磁力，揭示纳米尺度下的磁近场分布，同时最大程度地抑制其电对应物。所提出的方法为基于光磁对比度的纳米显微镜开辟了新途径，为纳米尺度下物质的全光自旋控制和光磁操纵提供了一种研究工具。
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