What is nonlinear optics?
Lasers can now generate light pulses down to 100 attoseconds thereby enabling real-time measurements on ultrashort time scales that are inaccessible by any other methods. Scientists at the Max Born Institute for Nonlinear Optics and Short Time Spectroscopy (MBI) in Berlin have now demonstrated timing control with a residual uncertainty of 12 attoseconds - a new world record for the shortest controllable time scale.
Caltech researchers have created a nanoscale crystal device that allows them to confine both light and sound vibrations in the same tiny space.
The interactions between sound and light in this optomechanical crysta can result in mechanical vibrations with frequencies as high as tens of gigahertz, or 10 billion cycles per second. Being able to achieve such frequencies gives these devices the ability to send large amounts of information, and opens up a wide array of potential applications—everything from lightwave communication systems to biosensors capable of detecting (or weighing) a single macromolecule.
A marine crustacean could inspire the next generation of DVD and CD players, says a new study in Nature Photonics.
Mantis shrimps found on the Great Barrier Reef in Australia have the most complex vision systems known to science. They can see in twelve colors (humans see in only three) and can distinguish between different forms of polarized light.
Special light-sensitive cells in mantis shrimp eyes act as quarter-wave plates; they can rotate the plane of the oscillations (the polarization) of a light wave as it travels through it. This capability makes it possible for mantis shrimps to convert linearly polarized light to circularly polarized light and vice versa.
The power of quantum mechanics for data transmission is intriguing because of potential for secure, high speed communications but current storage and transmission of quantum information is far too fragile to have any practical value in the near term.
In classical communications, a bit can represent one of two states - either 0 or 1. But because photons are quantum mechanical objects, they can exist in multiple states at the same time. Photons can also be combined, in a process known as entanglement, to store a bit of quantum information (i.e. a qubit).
Galileo merged the fields of cosmology and astronomy, thanks to his telescope, which gave scientists a more accurate way to observe and define the heavens. His telescope helped shift authority in the observation of nature from men to instruments. From backyard astronomers to the Hubble Telescope to the Vatican Observatory, Galileo’s impact on astronomy is both formative and lasting.
Galileo's contributions to science in general, and optics and astronomy in particular, were so monumental that over 350 years later we still discuss them in introductory physics courses.
Galileo Galilei wasn't just an Italian physicist, mathematician, astronomer, philosopher and heresy suspect (not to mention father of modern observational astronomy, modern physics, science, and modern science, that last one he was named by both Hawking and Einstein). He was also a friend of the Medici, the political Italian dynasty whose patronage of scientists and artists led to the Renaissance.1
A real life Alice In Wonderland story is a little closer to reality now that researchers in China have created the first tunable electromagnetic gateway.
In a new paper, researchers from the Hong Kong University of Science and Technology and Fudan University in Shanghai have described the concept of a "a gateway that can block electromagnetic waves but that allows the passage of other entities" like a "'hidden portal' as mentioned in fictions."
The gateway uses transformation optics and an amplified scattering effect from an arrangement of ferrite materials called single-crystal yttrium-iron-garnet that force light and other forms of electromagnetic radiation in complicated directions to create a hidden portal.
Superman's X-ray vision may be closer than you think. The tubes that power X-ray machines are shrinking and also improving in clarity.
A team of nanomaterial scientists, medical physicists, and cancer biologists at the University of North Carolina has developed new lower-cost X-ray tubes packed with sharp-tipped carbon nanotubes for cancer research and treatment. This tiny technology was presented at this year's meeting of the American Association of Physicists in Medicine in Anaheim, California.
The science goal is to image human breast tissue, laboratory animals, and cancer patients under radiotherapy treatment, and to irradiate cells with more control than previously possible with conventional X-ray tubes. The fun goal will be just about anything else.