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.
Albert Einstein's theory of general relativity, which describes how the gravity of a massive object like a star can curve space and time, has been successfully used to predict the bending of starlight by the sun, small shifts in the orbit of the planet Mercury and the phenomenon known as gravitational lensing
There's a bipolar force with a repulsive side that doesn't involve cosmic opera or wooden acting - it's light. And it can be used to control components on silicon microchips, meaning future nanodevices could be controlled by light rather than electricity, according to Yale researchers.
The team previously discovered an 'attractive' force of light and showed how it could be manipulated tiny switches in semiconducting micro- and nano-electrical systems. They say they have now uncovered its non-evil twin - a repulsive force.
A team of physicists and engineers have demonstrated all-fibre quantum logic, where single photons are generated and used to perform the contolled-NOT quantum logic gate in optical fibers with high fidelity.
The only quantum technology in practical use today is quantum cryptography and is currently limited in the distance over which secure communication may occur.
More sophisticated quantum networks will require multiple nodes with the ability to implement small-scale quantum processing in order to increase the range of quantum communications. Such networks will rely on optical fibre links, making fibre-based photon generation and information processing of key technological importance.
Ounce for ounce, spinach has more nutritional value than iceberg lettuce; in general, darker colors in leafy vegetables mean more antioxidants and therefore more health benefits.
Knowing that, plant physiologists has developed a way to make lettuce darker and redder — and therefore healthier — using ultraviolet light-emitting diodes (LEDs).
Tunable fluidic micro lenses can focus and direct light at will to count cells, evaluate molecules or create on-chip optical tweezers, according to a team of Penn State engineers. They may also provide imaging in medical devices, eliminating the necessity and discomfort of moving the tip of a probe.
Conventional, fixed focal length lenses can focus light at only one distance. The entire lens must move to focus on an object or to change the direction of the light. Attempts at conventional tunable lenses have not been successful for lenses on the chip. Fluidic lenses, however, can change their focal length or direction in less than a second while remaining in the same place and can be fabricated on the chip during manufacture.
Ultrafast, light-sensitive video cameras are needed for observing high-speed events such as shockwaves, communication between living cells and a Usain Bolt sprint. To catch such elusive moments, a camera must be able to capture millions or billions of images continuously with a very high frame rate. Conventional cameras have not been up to the task but researchers at the UCLA Henry Samueli School of Engineering and Applied Science say they have developed a novel, continuously running camera that captures images roughly a thousand times faster than any existing conventional camera.
People are always going on about the life expectancy of babies and people in general. Now quantum states are getting their due.
For the first time, scientists have succeeded in measuring and controlling the lifetime of quantum states with potential use in optoelectronic chips. This achievement is highly significant for the ongoing development of this cutting-edge technology. The breakthrough involved measuring the intersubband relaxation time of charge states in silicon-germanium SiGe structures on a picosecond scale. Experiments have also shown that it is possible to control and extend these times. As a result, this body of work represents a major advance in the development of data processing based on optoelectronic chips.
Researchers from the University of Melbourne and Princeton University have shown for the first time that the difference in reflection of light from the Earth's land masses and oceans can be seen on the dark side of the moon, a phenomenon known as earthshine.
Sally Langford from the University of Melbourne's School of Physics who conducted the study as part of her PhD, says that the brightness of the reflected earthshine varied as the Earth rotated, revealing the difference between the intense mirror-like reflections of the ocean compared to the dimmer land.
"In the future, astronomers hope to find planets like the Earth around other stars. However these planets will be too small to allow an image to be made of their surface," she said.