That could have a significant impact on the way optical cloaks are designed and made.
Similar to previously reported metasurface cloaks in reflection geometry34,35,36,37,38, the metasurface of the hybrid invisibility cloak is designed for a fixed incident angle, and therefore, the cloaking effect is limited to a certain angle with small tolerance.
More importantly, this thermal ground cloak is designed to exclude heat flux without knowing the information of the cloaked object.
The second cloak was designed to hide objects from a person stood directly in front or behind.
Although the cloak is designed for a wavelength of 590 nm, because of the latitude in manufacturing the prisms, the geometric parameters slightly deviate from the design.
Although the cloak is designed at 590 nm, in accordance with the experiment, the ray-tracing calculation is performed at 532 nm.
Here, the macroscopic invisibility cloak is designed using two calcite prisms glued together with the protruding bottom surface of the cloak serving as a deformed mirror, as shown in Figure 1c.
Just as the Renaissance-era chastity belt and the recent invention of anti-rape knickers have attempted to make women harder to disrobe, so the cloak is designed to deter the uncontrollable urges of men.
For example, a 3D omnidirectional acoustic carpet cloaking was designed with a pyramid-shaped structure (Fig. 10d).
By following the coordinate transformation approach, 2D and 3D theoretical acoustic cloaking shells were designed to hide objects from sound waves in fluids.
