A British student has used an ordinary camera and
tripod to capture a prizewinning photograph of a single atom.
David Nadlinger was able to capture the atom, which
was held between two small needle tips about 2 millimetres apart.(David
Nadlinger, The University of Oxford )
The long exposure photograph was taken by University
of Oxford student David Nadlinger through a window of a ultra-high vacuum
chamber.
Apart from using a lens accessory that increases the
focal length of an existing lens, much of the camera technology Mr Nadlinger
used was simplistic.
But the scientific process behind capturing the atom
in the photo was much more complex.
The single positively-charged strontium atom, held
near motionless by electric fields, was illuminated by a laser of a blue-violet
colour which caused the atom to absorb and re-emit light quickly enough for an
ordinary camera to capture it in a long exposure photograph.
Mr Nadlinger was able to zoom in close enough to
capture the atom, which was held between two needle tips about 2 millimetres
apart.
The resulting image named Single Atom in an Ion Trap
came first in the Equipment and Facilities category of the Engineering and
Physical Sciences Research Council's national science photography competition.
You might have the right camera rig, but it might
not be so simple to snap your own atom selfie just yet.
"The idea of being able to see a single atom
with the naked eye had struck me as a wonderfully direct and visceral bridge
between the miniscule quantum world and our macroscopic reality," Mr
Nadlinger said.
"A back-of-the-envelope calculation showed the
numbers to be on my side, and when I set off to the lab with camera and tripods
one quiet Sunday afternoon, I was rewarded with this particular picture of a
small, pale blue dot."
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