Physicists have created a flat dielectric mirror, which is capable of focusing light in the reflected beam. Its working principle is based on the effect of photonic jet, according to which micro-particles in the material can function as a lens, focusing the radiation in absolonova range. The results, published in the journal Scientific Reports, will help to create instruments for optical imaging with higher resolution images.
Conventional spherical mirrors refract the light thanks to its curved shape. The rays of light in the mirror there are different way depending on the crash site, which differently refracted. This way they lose their parallelism and are going focus. The flat mirrors due to the same thickness throughout their length, refraction does not occur. Reflected from such mirrors rays coming to this parallel to each other, not going in one point. Not long ago, the researchers were able to create flat mirrors that have the focus. They represent a layered structure of dielectric materials or metal-insulator-metal and is capable of focusing light at a certain angle of incidence close to the surface of the lens.
Physics under the leadership of Cheng-Yang Liu (Cheng-Yang Liu) from the National University of Yang-Ming developed a flat mirror, working on a completely different principle. The principle of operation is based on the effect of photonic jet, which is the focus of the individual dielectric particles of the incident light. Each microparticle in its own way refracts fall on her light and collect it in your focus at a short distance from the surface. Depending on the shape of the particle will differ and the kind of photonic jets — radiation flux, which is formed on the shadow side of the particle after the refraction of the incident light.