New nano-structured glass optical elements could significantly reduce the cost of medical imaging.
In their Applied Physics Letters paper, the team describes how they have used nano-structures to develop new monolithic glass space-variant polarization converters. These millimeter-sized devices generate ‘whirlpools’ of light enabling precise laser material processing, optical manipulation of atom-sized objects, ultra-high resolution imaging and maybe even table-top particle accelerators.
A giant cosmic necklace glows brightly in this NASA Hubble Space Telescope image of an object named (surprise) the Necklace Nebula, a recently discovered planetary nebula which is the glowing remains of an ordinary, Sun-like star.
The nebula consists of a bright ring, measuring 12 trillion miles across, dotted with dense, bright knots of gas that resemble diamonds in a necklace. The knots glow brightly due to absorption of ultraviolet light from the central stars.
The Necklace Nebula is located 15,000 light-years (4,600 parsecs) away in the constellation Sagitta (the Arrow). In this composite image, taken on July 2, 2011, Hubble's Wide Field Camera 3 captured the glow of hydrogen (blue), oxygen (green), and nitrogen (red).
One of the earliest lessons science students learn is that a beam of light travels in a straight line and fan out, or diffract, as they travel. Recently it was discovered that light rays can travel without diffraction in a curved arc in free space. These rays of light were dubbed “Airy beams,” after the English astronomer Sir George Biddell Airy, who studied what appears to be the parabolic trajectory of light in a rainbow.
Now, scientists with the Lawrence Berkeley National Laboratory have demonstrated the first technique that provides dynamic control in real-time of the curved trajectories of Airy beams over metallic surfaces.
Assuming you don't have the space for a smelly compost heap but want to be as environmentally responsible as possible, what’s the most
responsible way to dispose of a banana peel, or any other food waste?
A new study about the impact of various food waste disposal systems says putting it into a garbage disposer results in lower global warming potential than putting it in the trash and sending it to a landfill.
There are rules in making presentations to people - in wine sales, for example, as we outlined in The Science Of Wine And Cheese, you buy on bread and sel on cheese because eating cheese is the way people get the most positive taste. In science, if the audience wants to be inspired, talk about large motion in space and show Hubble pictures. If they like the 'physics is soooo weird' kind of science, go small. There are always strange and unexpected things at the nanoscale, even for the most common materials such as water.
The metabolic profiles of blood serum have revealed significant differences in metabolites between men and women, say scientists at the Helmholtz Zentrum München who have concluded that there is a need for gender-specific therapies.