Trinh M Tuan, Smail Gregory, Makhal Krishnandu, Yang Da Seul, Kim Jinsang, Rand Stephen C
Center for Dynamic Magneto-Optics, Dept. of Electrical Engineering & Computer Science, University of Michigan, Ann Arbor, MI, 48109, USA.
Department of Physics, University of South Florida, Tampa, FL, 33620, USA.
Nat Commun. 2020 Oct 20;11(1):5296. doi: 10.1038/s41467-020-19125-w.
The subject of electromagnetism has often been called electrodynamics to emphasize the dominance of the electric field in dynamic light-matter interactions that take place under non-relativistic conditions. Here we show experimentally that the often neglected optical magnetic field can nevertheless play an important role in a class of optical nonlinearities driven by both the electric and magnetic components of light at modest (non-relativistic) intensities. We specifically report the observation of magneto-electric rectification, a previously unexplored nonlinearity at the molecular level which has important potential for energy conversion, ultrafast switching, nano-photonics, and nonlinear optics. Our experiments were carried out in nanocrystalline pentacene thin films possessing spatial inversion symmetry that prohibited second-order, all-electric nonlinearities but allowed magneto-electric rectification.
电磁学这一主题常被称作电动力学，以强调在非相对论条件下发生的动态光与物质相互作用中电场的主导地位。在此，我们通过实验表明，即便在适度（非相对论）强度下由光的电场和磁场分量驱动的一类光学非线性现象中，常常被忽视的光磁场仍能发挥重要作用。我们特别报告了磁电整流的观测结果，这是一种此前未被探索的分子水平非线性现象，在能量转换、超快开关、纳米光子学和非线性光学方面具有重要潜力。我们的实验是在具有空间反演对称性的纳米晶并五苯薄膜中进行的，这种对称性禁止二阶全电非线性，但允许磁电整流。
