Fig. 2: Full control of HPhP wavevector (kHPhP) with doped semiconductors.
From: Polariton design and modulation via van der Waals/doped semiconductor heterostructures
The normalized kHPhP varies with the real part of the permittivity of the substrate (Re(εs)). All curves are calculated by Eq. (2), while all symbols are experimental data. Colored shadows indicate the tunable range of kHPhP with that substrate with achievable doping. Solid symbols represent fundamental modes, while open symbols represent high-order modes. Data with dielectric (metallic) InAs are plotted with black (purple) stars. Data with metallic CdO are plotted with purple rectangles. Note that all noble metals lead to nearly identical kHPhP, and the color box on the y-axis is extended for visualization purposes. Due to the accessible carrier concentration and high-frequency permittivity values, the tuning range of Re(εs) of InAs and CdO are −10 to 10, and −100 to −1, respectively. All data above the horizontal dashed line are HPhPs with modal order above 0 (l > 0).
