“We have two contradictory pictures of reality; separately neither of them fully explains the phenomena of light, but together they do.” -Albert Einstein.
Fabrizio Carbone and his team at EPFL performed an experiment involving targeting a beam of electrons close to a preset nanowire. The nanowire was prepared by firing a laser beam on a thin strand of nanowire. This excites and adds to the energy of charged particles and hence making them vibrate. Vibrating particles travel around the nanowire strand. The particles travelling opposite directions give rise to standing waves. The standing waves produced act as the source of light in the experiment. Then the light travelling around nanowire was allowed to interact with a stream of electrons fed in the nearby region of the nanowire.
The result of the interaction was either speeding up or slowing down of electrons. This was captured using ultrafast electron microscope- more specifically EPFL’s ultrafast energy-filtered transmission electron microscope – one of the two in the world. The standing wave imaged by the microscope acts as a fingerprint of wave nature of light. In addition, the particle nature was demonstrated by speed difference of electrons. The electrons hit the light particles i.e. photons and hence the change speeds occurred due to energy exchange between electrons and photons via quanta.
“Being able to image and control quantum phenomena at the nanometer scale like this opens up a new route towards quantum computing.” says Fabrizio Carbone
The whole experiment and imaging was performed in collaboration of Laboratory for Ultrafast Microscopy and Electron Scattering of EPFL, the Department of Physics of Trinity College (US) and the Physical and Life Sciences Directorate of the Lawrence Livermore National Laboratory.
The detailed work paper was published in Nature Communications.
Watch out the following video uploaded by EPFL:
Also read: Scientists in Scotland Slow Down the Speed of Light in Vacuum
Light, a wave or particle? Or, do you support the dual nature? Tell us in comments below!
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