Fig. 1
From: Ultrawide thermal free-carrier tuning of dielectric antennas coupled to epsilon-near-zero substrates
Thermal free-carrier refraction in intrinsic InSb. a Reflection spectra of an intrinsic InSb film at various temperatures. The long-wavelength roll-off is due to Drude dispersion and increases with temperature. b Temperature-dependent free-carrier concentrations inferred from fits to the curves in Fig. 1a (square red dots) show good agreement with fit-free models of thermally activated carriers (blue)
