Fig. 2
From: Observation of reflectionless absorption due to spatial Kramers–Kronig profile
Simulations with different locations of Gaussian beam sources. In the simulation, parameters ω p, γ, and q in the permittivity profile ε(ω, x) described by Eq. (2) are set as ω p = 0.4ω 0, γ = 0.03ω 0, and q = 0.5ω 0, respectively. Simulations at the frequency of 0.6ω 0 (a, b) and 1.2ω 0 (c, d) are performed, respectively. In a and c, the Gaussian beam source is located at (−10λ 0, 0), and the incident angle of the Gaussian beam with respect to the x axis is 0º. In b and d, the Gaussian beam source is located at (−10λ 0, −10λ 0), and the incident angle is 45º. e–h The intensity drops along the propagation directions in dB scale are provided, respectively. In all figures, the Gaussian beams are continuously dissipated and eventually absorbed in the resonance region without any observable reflection
