july 30 (BuyLinkShop) -- electrical engineers at ucla possess used a recent light-bending technique to convert the wavelengths of light, a breakthrough that could boost the work of numerous optical technologies.
lightwave frequency transmutation is solution for a multiformity of imaging and sensing technologies, yet the process is frequently inefficient, adding whole and perplexity to a multiformity of devices.
the recent wavelength transmutation technique -- vivid friday in the journal truth communications -- relies on semiconductor surface states, a phenomenon that occurs when surface atoms aren't effluent sufficient to cohesively bind, supple a breakdown in ultimate organization.
typically, electrical engineers test to shun semiconductor surface states. incomplete chemical bonds, too known as a "dangling bond," interfere with conductive abilities of semiconductors.
"there possess been numerous efforts to subdue the result of surface states in semiconductor devices without realizing they possess uncommon electrochemical properties that could strengthen rare symbol functionalities," mona jarrahi, professor of electrical and computer engineering at ucla, said in a weigh quit.
for the recent study, researchers unwavering to use utility of the vast yet trifling electric fields created by semiconductor surface states.
when struck by incoming light, electrons in a semiconductor lattice spread their energy state, allowing them to spring environing within the lattice. the electric scope past boosts the energy of the already vehement electrons.
these hyperactive electrons unload their energy in the shape of uncertain optical wavelengths, thus completing the wavelength transmutation.
because the phenomenon is prejudiced to the surface of a semiconductor, researchers deployed a nanoantenna robe that bends whitish and traps photons within the semiconductor's surface layer.
"through this recent framework, wavelength transmutation happens easily and without any extra subjoined spring of energy as the incoming whitish crosses the field," said spend producer deniz turan, a postdoctoral researcher working underneath jarrahi at ucla terahertz electronics laboratory.
researchers successfully used their recent technology to convert a 1,550-nanometer wavelength whitish shine into the terahertz lightwaves, featuring wavelengths of 100 micrometers up to 1 millimeter.
when scientists incorporated the light-bending technology into an endoscopy probe, which is used for in-vivo imaging and spectroscopy, they boosted the device's efficiency by a factor of 100.
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