Detection and characterization of attenuated multimode waveguiding in SiO2 slabs using photoemission electron microscopy

Multimode waveguiding in the visible and near-ultraviolet spectral regime is observed and characterized in thermally grown SiO 2 layers on silicon using photoemission electron microscopy (PEEM). Comparison with finite-element-method simulations allows identifying order and character of the attenuated modes. Real-time investigations on mode propagation support these findings and give additional evidence for the existence of radiative modes. Finally, the presented experimental results illustrate how a defined deposition of gold nanoparticles can substantially enhance the sensitivity of the PEEM technique to electromagnetic field modes supported by thin dielectric and insulating layers.

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Klick, A., Wagner, R., Großmann, M., Kadem, L.F., Leißner, T., Rubahn, H.-G., Selhuber-Unkel, C., Bauer, M., 2018. Detection and characterization of attenuated multimode waveguiding in SiO2 slabs using photoemission electron microscopy. Physical Review B 98, 085128–1–085128–7. https://doi.org/10.1103/PhysRevB.98.085128
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