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Their capability to confine and manipulate light well below the diffraction limit, combined with low losses, has enabled breakthroughs in subwavelength waveguiding, hyperlensing, infrared imaging, and molecular sensing. While far\u2010field spectroscopy and scanning near\u2010field optical microscopy have been widely used to characterize PhPs, these photon\u2010based techniques often suffer from limited spatial resolution, momentum mismatch, and a scarcity of suitable light sources and detectors in the infrared region. In contrast, scanning transmission electron microscopy coupled with electron energy\u2010loss spectroscopy (STEM\u2010EELS) has recently emerged as a powerful method for probing PhPs, offering broadband excitation and detection, access to large momentum transfers, sub\u2010nanometer spatial resolution, and substrate\u2010free measurements. 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