Abstract
Plasmonic properties of newly discovered class of 2‐dimensional materials (2DM): one‐to‐few monolayer thick metals synthesized using confinement heteroepitaxy (CHet)1 will be discussed. Optical properties of 2DM are modulated at the ultimate scale of (a few) nanometers, thus the characterization also requires a similar spatial resolution. Scattering‐type scanning near‐field optical microscope (sSNOM) allowed us to reveal surface impedance of the 2D‐Ga layers coated with bilayer graphene. 2D‐Ga has extremely large optical contrast due to high density of states, resulting in ultimate light‐matter interactions within an atomic layer. 2D‐Ga was shown to not cover the surface uniformly, leaving the valleys of lower contrast. sSNOM data has been analyzed with two novel algorithms: impedance clustering (revealing metal encapsulation) and photonic decay curves (via 3D sSNOM mapping). Photonic decay is directly related to surface plasmonic density of states, the quantity of interest for nanophotonics applications of 2D‐metals. Author acknowledges Mr. M. Blades for help with data processing, Dr. T. Gokus (Neaspec) – for sSNOM instrumentation, and Prof. J. Robinson (PSU) – for CHet material synthesis. This research was partially supported by the NSF ECCS‐1509786, and Penn State Quantum Characterization Infrastructure initiative. [1] N.Briggs, B.Bersch, A.De La Fuente Duran, Y.Wang, A.Li, C.Navarro, J.Robinson, EP03.15.03 : Two‐Dimensional Monoelemental Materials via Confinement Heteroepitaxy, MRS Fall Meeting, Boston MA, 11/25‐30/2018. Figure 1
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