In a typical camera-phone, the image is focused by the lens onto a photosensitive silicon chip.
And where there is light, and a photosensitive drug, there may well be action.
Researchers attached electrodes to the heads of 23 children, just over half of whom had photosensitive epilepsy.
Photosensitive epilepsy is thought to affect between 0.5% and 0.8% of children aged between four and 14.
Stereolithography works by steering laser beams through a photosensitive liquid that solidifies when it is exposed to enough light.
Though the phenomenon was observed before television, photosensitive epilepsy, as it is also called, has become far more common as TV has spread.
CNN: Japanese cartoon triggers seizures in hundreds of children
Once an isotope causes the crystal to flash, a photosensitive cathode releases electrons into a vacuum tube where a chain reaction produces a cascade, as in the Geiger counter.
In a 35-nanosecond burst of laser light, 4.3 megabytes of a color image are burned on a photosensitive DuPont polymer film, rearranging the chemistry into a zebra-striped interference pattern.
Light particles blast the photosensitive material on a silicon wafer to create the features on a chip, just as in photography, photons transform silver molecules on photographic film into visible images.
In the case of dye-based cells, which were invented at the Federal Polytechnic School of Lausanne, in Switzerland, in the 1990s, the light is first captured by molecules of a photosensitive dye.
ECONOMIST: A new type of cell may bring ��solar�� energy indoors
The Broadcasting Code states that broadcasters must take precautions to maintain a low-level risk to viewers who have photosensitive epilepsy and should give warning if they do go ahead with such lighting.
When a beam of light is focused by the cornea and the lens, at the front of the eye, on to the retina, at the back, it stimulates photosensitive cells known as rods and cones.
Steven Burt, G24's chief financial officer, talks of light-bulb-powered TV remote controls, smoke detectors and computer keyboards. (A non-removable internal battery would store charge for use when the lights are off.) The company already offers prototypes of bags and jackets with photosensitive panels woven in, designed to charge digital cameras and mobile phones, and a hotel in Las Vegas is using G24's products to run its electric window-blinds.
ECONOMIST: A new type of cell may bring ��solar�� energy indoors
应用推荐