Figure 3
From: High-resolution grayscale image hidden in a laser beam
Fabricated metasurface, experiment setup and metasurface device characterization. (a) SEM image of the fabricated metasurface. The scale bar is 500 nm. (b) Experimental setup. The collimated light beam with the required linear polarization is generated using a linear polarizer (LP) and is incident on the metasurface, which is mounted on a 3D translation stage. An objective with a magnification of 10× is used to collect and expand the resultant beam. The images are captured by a CCD. The analyzer, which is a linear polarizer, is placed in front of the CCD to reveal the hidden image. The simulated and experimental results without (c) and with the analyzer (d). Note that the direction the transmission axis is along the vertical direction. (e) The simulated and experimental results for the analyzer with various directions of transmission axis. The results at 0°, 45°, 90° and 135° are given. The scale bar is 500 μm.
