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which allows the scientists to rationally design sensors and detectors. Because biological systems are particularly good at sensing changes in the environmentâ##our cells constantly monitor blood sugar
they can create ultra-sensitive detectors for explosives such as TNT, as well as at least two different types of pesticides.
or in-pipe detectors, which sometimes use video cameras to look for signs of pipe breaks. But all such systems are very slow
At present, the 3 mph top speed of the device is imposed by the propulsion motors, not the detector itself,
Strano and the paper lead author, postdoc and plant biologist Juan Pablo Giraldo, envision turning plants into self-powered, photonic devices such as detectors for explosives or chemical weapons.
#Ultra-thin high-speed detector captures unprecedented range of light waves New research at the University of Maryland could lead to a generation of light detectors that can see below the surface of bodies walls and other objects.
Using the special properties of graphene a two-dimensional form of carbon that is only one atom thick a prototype detector is able to see an extraordinarily broad band of wavelengths.
A research paper about the new detector was published Sunday September 07 2014 in Nature Nanotechnology.
Lead author Xinghan Cai a University of Maryland physics graduate student said a detector like the researchers'prototype could find applications in emerging terahertz fields such as mobile communications medical imaging chemical sensing
however in part because it is difficult to detect light waves in this Range in order to maintain sensitivity most detectors need to be kept extremely cold around 4 Kelvin or-452 degrees Fahrenheit.
Existing detectors that work at room temperature are bulky slow and prohibitively expensive. The new room temperature detector developed by the University of Maryland team
and colleagues at the U s. Naval Research Lab and Monash University Australia gets around these problems by using graphene a single layer of interconnected carbon atoms.
Using a new operating principle called the hot-electron photothermoelectric effect the research team created a device that is as sensitive as any existing room temperature detector in the terahertz range
Graphene a sheet of pure carbon only one atom thick is suited uniquely to use in a terahertz detector
The concept behind the detector is simple says University of Maryland Physics Professor Dennis Drew.
The speed and sensitivity of the room temperature detector presented in this research opens the door to future discoveries in this in-between zone.
Using a distant detector on the other side of the sample, the researchers recorded the sample's high-resolution hologram,
and electron those reaching the detectors simultaneously are very likely to have come from the same molecule.
and trees when under stress and detectors to identify concentrations in air samples could be used to monitor our changing ecology.
The team has been able to convert the mobile phone into a sensitive E-coli or giardia detector,
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