Generation and Enhancement of Persistent Nanoscale Magnetization in All‐Dielectric Metasurfaces by Optically Injected and Localized Free Carriers

2026/01/31 by Shivaksh Rawat, Samyobrata Mukherjee, Gennady Shvets
Engineering · Materials Science · Physics and Astronomy · #Dielectric #Electromagnetic field #Electromagnetic radiation #Magnetic field #Metamaterial #Metamaterials and Metasurfaces Applications #Nanoscopic scale #Optical rectification #Orbital Angular Momentum in Optics #Plasmonic and Surface Plasmon Research #Quasistatic process #Rectification #Scattering #physics.app-ph #physics.optics #physics.plasm-ph

paper · pdf · open access · doi:10.1002/advs.76635

published in Advanced Science, e76635 (Wiley)

arxiv created 2026/04/22 · openalex publication_date 2026/08/03 · openalex created_date 2026/08/04 · arxiv updated 2026/08/05 · openalex updated_date 2026/08/05

Abstract

Time-varying dielectric metasurfaces that support sharp optical resonances with nontrivial electromagnetic field distributions constitute a unique platform for realizing temporal interfaces for metasurface-guided waves (MGWs). Rapidly changing metasurface resonance enables frequency conversion and temporal scattering of a concurrently propagating MGW. Using analytical methods and electromagnetic simulations, free carriers are locally generated to produce frequency-shifted infrared MGWs. Such time interfaces can be utilized to generate large, highly localized quasistatic magnetic fields within the metasurfaces. The resulting nanoscale magnetization, supported by the residual circulating currents, persists for several optical cycles after the departure of the time-scattered MGWs. During the rectification process, the initial electromagnetic energy of the injected MGWs is partitioned between the temporally scattered MGWs, the residual motion of the free carriers, and a quasistatic magnetic field.

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