e-biblioteka - najnowsze artykuły

  • 19.12.2013
      A view of the electron diffraction laboratory. Here, the microcosmos is being explored with ultrashort bursts of electrons. A new stopwatch made of light makes it possible to measure the pulses exactly, and is potentially capable of attaining attosecond precision. Credit: Thorsten Naeser A stopwatch made of light can...
  • 30.11.2013
    Streszczenie: Powstał nowy kompaktowy system czujnikowy wykorzystujący laser polimerowy pompowany diodami LED. Okazało się, że laser ten zdolny jest do szybkiej i czułej detekcji materiałów wybuchowych.  Międzynarodowy terroryzm wymusił zapotrzebowanie na czułe ekonomiczne systemy wykrywania materiałów wybuchowych....
  • 30.11.2013
      Laser diodes versus LEDs Abstract: Solid-state lighting based on light-emitting diodes (LEDs) is the most efficient source of high color quality white light. Nevertheless, they show significant performance limitations such as the "efficiency droop". Blue laser diodes operated in stimulated emission offer a potential...
  • 30.11.2013
      Researchers have created tiny holograms using a "metasurface" capable of the ultra-efficient control of light, representing a potential new technology for advanced sensors, high-resolution displays and information processing.  Researchers have created tiny holograms using a "metasurface" capable of the...
  • 31.10.2013
    Zoomable Holograms Pave the Way for Versatile, Portable Projectors New techniques magnify images without requiring bulky zoom lenses These two still photos show the same holographic image. In the second photo the image has been magnified by the lensless projector. Credit: Tomoyoshi Shimobaba, Chiba University and Michal Makowski, Warsaw...
  • 31.10.2013
    Terahertz (THz) radiation — radiation in the wavelength range of 30 to 300 microns — is gaining attention due to its applications in security screening, medical and industrial imaging, agricultural inspection, astronomical research, and other areas. Traditional methods of generating terahertz radiation, however, usually involve large...
  • 29.10.2013
    Scientists from Harvard University and the Massachusetts Institute of Technology (MIT) are challenging the conventional wisdom about light, and they didn’t need to go to a galaxy far, far away to do it. Working with colleagues at the Harvard-MIT Center for Ultracold Atoms, a group led by Harvard Professor of Physics Mikhail...
  • 30.09.2013
    Imagine an electronic display nearly as clear as a window, or a curtain that illuminates a room, or a smartphone screen that doubles in size, stretching like rubber. Now imagine all of these being made from the same material. Photographs of a stretchable OLED (original emission area: 5.0 mm × 4.5 mm) at specified strains (up to 120...
  • 30.09.2013
    Grafen, to nowy materiał, który stanowi jednoatomowa warstwa węgla. Atomy węgla ułożone są w narożnikach sześciokątów tworząc strukturę przypominającą plaster miodu. Grafen jest nowym i obiecującym materiałem gdyż jest on bardzo giętki, lekki, przewodzi prąd elektryczny oraz charakteryzuje się duża wytrzymałością mechaniczną,...
  • 29.08.2013
    Christoph Hauri in the laser lab at the Paul Scherrer Institute. Credit: Scanderbeg Sauer Photography A terahertz laser developed at the Paul Scherrer Institute makes it possible to control a material's magnetisation at a timescale of picoseconds. In their experiment, the researchers shone extremely short light pulses from the laser onto...