@article {Mamaikin:22, title = {Electric-field-resolved near-infrared microscopy}, journal = {Optica}, volume = {9}, number = {6}, year = {2022}, month = {Jun}, pages = {616{\textendash}622}, publisher = {Optica Publishing Group}, abstract = {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 {\textmu}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.}, keywords = {electric fields, Energy Transfer, Imaging systems, Structured light, Subwavelength structures, Sum frequency generation}, doi = {10.1364/OPTICA.454562}, url = {http://opg.optica.org/optica/abstract.cfm?URI=optica-9-6-616}, author = {Mikhail Mamaikin and Yik-Long Li and Enrico Ridente and Wei Ting Chen and Park, Joon-Suh and Alexander Y. Zhu and Federico Capasso and Matthew Weidman and Martin Schultze and Ferenc Krausz and Nicholas Karpowicz} }