“Sometimes the great discoveries are looking right at us and waiting.”
Berkeley Lab researchers have developed a nano-sized optical antenna that can greatly enhance the spontaneous emission of light from atoms, molecules and semiconductor quantum dots. This advance opens the door to light-emitting diodes (LEDs) that can replace lasers for short-range optical communications, including optical interconnects for microchips, plus a host of other potential applications.
“Since the invention of the laser, spontaneous light emission has been looked down upon in favor of stimulated light emission,” says Eli Yablonovitch, an electrical engineer with Berkeley Lab’s Materials Sciences Division. “However, with the proper optical antenna, spontaneous emission can actually be faster than stimulated emission.”
Yablonovitch, who also holds a faculty appointment with the University of California (UC) Berkeley where he directs the NSF Center for Energy Efficient Electronics Science (E3S), and is a member of the Kavli Energy NanoSciences Institute at Berkeley (Kavli ENSI), led a team that used an external antenna made from gold to effectively boost the spontaneous light emission of a nanorod made from Indium Gallium Arsenide Phosphide (InGaAsP) by 115 times. This is approaching the 200-fold increase that is considered the landmark in speed difference between stimulated and spontaneous emissions. When a 200-fold increase is reached, spontaneous emission rates will exceed those of stimulated emissions.
“With optical antennas, we believe that spontaneous emission rate enhancements of better than 2,500 times are possible while still maintaining light emission efficiency greater than 50-percent,” Yablonovitch says. “Replacing wires on microchips with antenna -enhanced LEDs would allow for faster interconnectivity and greater computational power.”
Read more: Rediscovering Spontaneous Light Emission
The Latest on: Spontaneous Light Emission
via Google News
The Latest on: Spontaneous Light Emission
- 2021 BMW X2 xDrive25e PHEV Debuts With 217 HP, 35 Miles Of EV Rangeon May 26, 2020 at 3:30 pm
BMW also tweaks the exterior styling, including removing the fog lights from the front to make the nose smoother.
- Correlated unpolarized photons enable camouflaged secure communicationon May 18, 2020 at 5:00 pm
At first, the researchers investigated the intensity correlation coefficient g (2) (τ) of classical unpolarized broadband amplified spontaneous emission (ASE) light emitted by an erbium-doped fiber ...
- Tunable light speeds up the search for the perfect qubiton May 13, 2020 at 8:53 am
OPOs also offer a higher spectral purity than equivalent tunable lasers, which ensures that the weak optical signals generated by atomic-scale defects are not obscured by amplified spontaneous light ...
- Dendrimers finally have what it takes to break into the laser sceneon May 10, 2020 at 11:14 pm
They are highly soluble, which makes them easy to incorporate into systems; they have high quantum yields, meaning you get a lot of the light you put in back ... materials—they produced amplified ...
- Dendrimers finally have what it takes to break into the laser sceneon May 7, 2020 at 5:00 pm
A team has produced a family of dendrimers that form single-crystals and can harvest non-polarized light and transform it into polarized emission ... 8). Dendrimers finally have what it takes ...
- Dendrimers finally have what it takes to break into the laser sceneon May 6, 2020 at 5:00 pm
They are highly soluble, which makes them easy to incorporate into systems; they have high quantum yields, meaning you get a lot of the light you ... amplified spontaneous emission and lasing ...
- For everyone who wants to get away – and aim high: the AUTOHOME roof tent for the new MINI Countryman.on May 1, 2020 at 5:00 pm
And in the eventuality that not just the road comes to an end but the day, too, there is now even the option of a place to spend the night – for entirely spontaneous use ... and a battery-operated LED ...
- This Month in Physics Historyon January 25, 2016 at 4:10 pm
such as absorption and stimulated emission. Atoms will only absorb photons of the correct wavelength: the photon disappears and the atom goes to a higher energy state, setting the stage for ...
- How to recognize lasingon October 1, 2009 at 5:00 am
B1a). The process is very different from light emission in a fluorescent or incandescent lamp, which occurs by spontaneous emission — a process in which materials emit light that can have almost ...
- Spontaneous-emission control by photonic crystals and nanocavitieson August 1, 2007 at 5:00 am
It has been clearly demonstrated that the spontaneous emission from light emitters embedded in photonic crystals can be suppressed by the so-called photonic bandgap, whereas the emission ...
via Bing News