Mamaikin, Mikhail Li, Yik-Long Ridente, Enrico Chen, Wei Ting Park, Joon-Suh Zhu, Alexander Y. Capasso, Federico Weidman, Matthew Schultze, Martin Krausz, Ferenc Karpowicz, Nicholas 2024-01-19T12:00:29Z 2024-01-19T12:00:29Z 2022-07-08 2022-06 2334-2536 https://pubs.kist.re.kr/handle/201004/115108 Access to the complete spatiotemporal response of matter due to structured light requires field sampling techniques with sub-wavelength resolution in time and space. We demonstrate spatially resolved electro-optic sampling of near-infrared waveforms, providing a versatile platform for the direct measurement of electric field dynamics produced by photonic devices and sub-wavelength structures both in the far and near fields. This approach offers high-resolution, time- or frequency-resolved imaging by encoding a broadband signal into a narrowband blueshifted image, lifting the resolution limits imposed by both chromatic aberration and diffraction. Specifically, measuring the field of a near-infrared laser with a broadband sampling laser, we achieve 1.2 mu m resolution in space and 2.2 fs resolution in time. This provides an essential diagnostic for complete spatiotemporal control of light with metasurface components, demonstrated via a metalens as well as a meta-axicon that forms broadband, ultrashort, truncated Bessel beams in the near infrared. Finally, we demonstrate the electric field dynamics of locally enhanced hot spots with sub-wavelength dimensions, recording the full temporal evolution of the electric field at each point in the image simultaneously. The imaging modality opens a path toward hyperspectral microscopy with simultaneous sub-wavelength resolution and wide-field imaging capability. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement English OSA Publishing Electric-field-resolved near-infrared microscopy Article 10.1364/OPTICA.454562 1 Optica, v.9, no.6, pp.616 - 622 Optica 9 6 616 622 Y scie scopus 000814087500004 Optics Optics Article PHASE-RETRIEVAL LASER-PULSES TERAHERTZ WAVE RECONSTRUCTION RESOLUTION TIME