Brooks NJ, Dorney KM, Ellis J, Denton AE, Gentry C, Ryan SA, Nguyen QLD, Morrill DW, Kapteyn HC, Murnane MM. High-harmonic spin-shearing interferometry for spatially resolved EUV magneto-optical spectroscopy.
OPTICS EXPRESS 2024;
32:19076-19087. [PMID:
38859051 DOI:
10.1364/oe.521669]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 04/30/2024] [Indexed: 06/12/2024]
Abstract
We present a method for achieving hyperspectral magnetic imaging in the extreme ultraviolet (EUV) region based on high-harmonic generation (HHG). By interfering two mutually coherent orthogonally-polarized and laterally-sheared HHG sources, we create an EUV illumination beam with spatially-dependent ellipticity. By placing a magnetic sample in the beamline and sweeping the relative time delay between the two sources, we record a spatially resolved interferogram that is sensitive to the EUV magnetic circular dichroism of the sample. This image contains the spatially-resolved magneto-optical response of the sample at each harmonic order, and can be used to measure the magnetic properties of spatially inhomogeneous magnetic samples.
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