Figure 3
From: Cavity-enhanced metallic metalens with improved Efficiency
Diffractive efficiency, transmittance (left label), and total efficiency (right label) of the BLM with respect to different thickness of PMMA (related to the cavity length). Here, the small symbols with connection lines are the simulation results, and the larger symbols with error bars are the experimental data. The red dashed horizontal line represents the simulated total efficiency of the conventional single layer metalens.
