Fig. 2
From: Superfluid motion and drag-force cancellation in a fluid of light
Spatial distribution of the output intensity of the fluid of light for various input conditions. The fluid of light flows from left to right. The white crosses at the center of the images indicate the position of the obstacle. Each image is 330 × 330 μm2. a At a fixed input intensity If, the input angle θin of the beam creating the fluid of light is tuned to vary the Mach number v/cs from 0 to 3.1. b Similarly, at a fixed input angle θin, If is progressively decreased to change v/cs from 0.9 to 2.0. c For large If, the fluid of light is clearly in the superfluid regime at v/cs = 0.4. The remaining lack of uniformity upstream from the obstacle is attributed to propagation losses due to linear absorption
