Wireless nanowire lasers absorb infrared, emit blue light

This article is about lasers (not necessarily the one pictured).

Enlarge / This article is
about lasers (not necessarily the one pictured). (credit:
Knick Banas / Flickr
)

Some of us are anxiously awaiting the photonics revolution,
where photons will band together to overthrow the tyranny of
electrons. One of the perpetual problems that’s slowing up the
revolution is light sources: you need to have a laser that is
coupled to a circuit that is going to do something. All of this has
to be on a tiny scale that can compete with electronics. It
shouldn’t consume much power either.

That’s a hard collection of hurdles to clear. But there is a
loophole: a photonic circuit could have the sort of application
that electronic devices don’t do very well.

Now, researchers have used that loophole as an excellent excuse
to do a very cool experiment in powering lasers. The researchers
showed how to power a laser with a laser—something that anyone
with a modicum of laser physics knowledge can do. However, this is
quite
different
: the powering laser changes the electronic structure
of the medium to trick it into lasing.

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Source: FS – All – Science – News
Wireless nanowire lasers absorb infrared, emit blue light