Fig. 4: Evaluations of photoemission properties in real, momentum, and energy spaces. | Nature Communications

Fig. 4: Evaluations of photoemission properties in real, momentum, and energy spaces.

From: Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy

Fig. 4

a, b Real-space PEEM image showing a nanofocusing with 75 nm size for a ring slit with m = 0 and large r0 = 20.7 μm excited with RCP at 410 nm. c, d Corresponding momentum-space PEEM image without an energy filter with a size of 0.26 Å−1. e Corresponding energy diagram indicating the localization of photoemitted electrons in energy and emission direction. f Energy distribution curves with a narrow energy spread of 0.65 eV. g Schematic of a design of flat photoemission emitter from back illumination with hBN near-field modes.

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