In:
Optica, Optica Publishing Group, Vol. 9, No. 6 ( 2022-06-20), p. 616-
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 µm 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.
Type of Medium:
Online Resource
ISSN:
2334-2536
DOI:
10.1364/OPTICA.454562
DOI:
10.1364/OPTICA.454562.public-review
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2022
detail.hit.zdb_id:
2779175-0
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