Nanowerk March 4, 2022 The mainstream transformation-optics-based optical illusions are inherently hindered by the extreme requirements of metamaterial compositions in practice and large computational cost. To address these issues researchers in China have proposed an intelligent optical illusion supported by form-free metasurfaces via a deep learning architecture which can render a similar illusion effect and greatly reduce the parameter space in physics. They have presented illustrative examples of conformal metasurfaces with a high-fidelity inverse design from either the near- or far-field in the simulation and experiment. They developed a full set of intelligent systems to benchmark the real-world optical illusion […]
Tag Archives: Invisibility cloaking
Making an object invisible under fluid flow
Phys.org January 7, 2022 Without any obstacle, the fluid flows along a straight line. If an obstacle is present, the straight streamline will be defected, and an observer can sense the size, shape, and position of the obstacle. Guiding the fluid to flow faster closer to the obstacle and slower farther from it conceals the distortions and restore original straight streamlines. Instead of engineering the mass density of the fluid to control the speed of the fluid flow, researchers in Singapore simply engineered the thickness of the fluid channel. They showed that thicker fluid channel gives rise to smaller mass […]
Scientists Built a New Kind of Invisibility Cloak, But It’s Not For Your Eyes
Science Alert September 4, 2021 An international team of researchers (Switzerland, UK) has achieved active acoustic cloaking and holography without prior knowledge of the wavefield so that objects remain invisible and illusions remain intact even for broadband moving sources. In the new approach, there’s a lot more versatility in making objects disappear – and it can even work the other way around to make it sound as if a non-existent object is taking up space in the room. FPGAs can respond to the audio speaker outputs with virtually no delay at all. So far, the researchers have managed to get […]