It's a simple, transparent acrylic plate – nothing embedded within it and nothing printed on its surface. Place it at a certain angle between a white wall and a light source, and a clear, coherent image appears of the face of Alan Turing, the famous British mathematician and father of modern computer science.
Researchers at EPFL found a way to control "caustics", patterns that appear when light hits a water surface or a transparent material. Thanks to an algorithm, they can shape a transparent object so that it reflects a coherent image.
Credit: (c) Alain Herzog
There's no magic here; the only thing at work is the relief on the plaque's surface and a natural optical phenomenon known as a "caustic," which researchers in EPFL's Computer Graphics and Geometry Laboratory have succeeded in bending to their will. Their research was presented recently at the Advances in Architectural Geometry Conference in Paris.
"With the technique that we've developed, we can compose any image we want, from a simple form such as a star to complex representations such as faces or landscapes," explains EPFL professor Mark Pauly, head of the laboratory, who conducted the study with four other scientists*.
This "caustic" effect is well known and easy to observe; a bit of sunlight shining on a pool of water produces patterns that dance on the surrounding tiles or walls. These undulating lines, apparently random, are generated by light that hits the moving surface of a pool or puddle. This effect, which is very mobile and dynamic in liquid, produces static patterns with solid transparent materials such as glass or transparent acrylic (better known as Plexiglass).
Scientifically, this phenomenon can be explained by light refraction. When light rays hit a transparent surface, they continue their trajectory but are bent as a function of the surface geometry and optical properties of the material. The light passing through is thus not uniformly distributed. It gets concentrated in certain points, forming some zones that are more intense and others that are more shaded.
Pauly and his colleagues studied the principles of this distribution, and were able to identify the curves and undulations they would need to give to the surface in order to direct the beams of light to a desired area. They then developed an algorithm to calculate the trajectories very precisely and thus form a specific image.
One of the most interesting and eagerly awaited applications of this method is in architecture. It could be applied to display cases, windows, fountains, and ornamentations on museums and monuments. In design it could be used for decorating glasses, vases, carafes, jewelry and many other objects. It has considerable potential in other, more technical applications as well, such as automobile headlights and projectors.
See the Youtube video: http://www.youtube.com/watch?v=0NXNAIqU8KM
*Thomas Kiser (EPFL), Michael Eigensatz (Evolute), Minh Man Nguyen (WAO) and Philippe Bompas.
Rapid water formation in diffuse interstellar clouds
25.06.2018 | Max-Planck-Institut für Kernphysik
When fluid flows almost as fast as light -- with quantum rotation
22.06.2018 | The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
Russian researchers together with their French colleagues discovered that a genuine feature of superconductors -- quantum Abrikosov vortices of supercurrent -- can also exist in an ordinary nonsuperconducting metal put into contact with a superconductor. The observation of these vortices provides direct evidence of induced quantum coherence. The pioneering experimental observation was supported by a first-ever numerical model that describes the induced vortices in finer detail.
These fundamental results, published in the journal Nature Communications, enable a better understanding and description of the processes occurring at the...
In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...
Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
25.06.2018 | Physics and Astronomy
25.06.2018 | Earth Sciences
25.06.2018 | Power and Electrical Engineering