“If we can precisely place molecules like this, it could be used in many more applications than just fast LEDs,” said Akselrod. “We could also make fast sources of single photons that could be used for quantum cryptography. This technology would allow secure communication that could not be hacked — at least not without breaking the laws of physics.”
Duke University researchers have made fluorescent molecules emit photons of light 1,000 times faster than normal — setting a speed record and making an important step toward realizing superfast light emitting diodes (LEDs) and quantum cryptography.
This year’s Nobel Prize in physics was awarded for the discovery of how to make blue LEDs, allowing everything from more efficient light bulbs to video screens. While the discovery has had an enormous impact on lighting and displays, the slow speed with which LEDs can be turned on and off has limited their use as a light source in light-based telecommunications.
In an LED, atoms can be forced to emit roughly 10 million photons in the blink of an eye. Modern telecommunications systems, however, operate nearly a thousand times faster. To make future light-based communications using LEDs practical, researchers must get photon-emitting materials up to speed.
In a new study, engineers from Duke increased the photon emission rate of fluorescent molecules to record levels by sandwiching them between metal nanocubes and a gold film.
The results appear online October 12 in Nature Photonics.
“One of the applications we’re targeting with this research is ultrafast LEDs,” said Maiken Mikkelsen, an assistant professor of electrical and computer engineering and physics at Duke. “While future devices might not use this exact approach, the underlying physics will be crucial.”
Mikkelsen specializes in plasmonics, which studies the interaction between electromagnetic fields and free electrons in metal. In the experiment, her group manufactured 75-nanometer silver nanocubes and trapped light between them, greatly increasing the light’s intensity.
When fluorescent molecules are placed near intensified light, the molecules emit photons at a faster rate through an effect called Purcell enhancement. The researchers found they could achieve a significant speed improvement by placing fluorescent molecules in a gap between the nanocubes and a thin film of gold.
To attain the greatest effect, Mikkelsen’s team needed to tune the gap’s resonant frequency to match the color of light that the molecules respond to. With the help of co-author David R. Smith, the James B. Duke Professor and Chair of Electrical and Computer Engineering at Duke, they used computer simulations to determine the exact size of the gap needed between the nanocubes and gold film to optimize the setup.
The Latest on: Superfast LEDs
via Google News
The Latest on: Superfast LEDs
- CEO Interview: New Game Studio Scores $37.5 Million, Execs From Riot, Blizzard, Valveon March 4, 2021 at 8:00 am
Theorycraft Games launched today with a healthy helping of hype: At $37.5 million, its initial investment round is one of the largest for a completely new game development studio. Chinese gaming firm ...
- Transport decarbonisation – will the pandemic help us change course in time?on March 2, 2021 at 1:25 pm
Over 250 people gathered together for the eighth PTRC Fireside Chat on 25 February 2021. This was an opportunity to probe whether or not the adage ‘never let a good crisis go to waste’ would apply to ...
- The best gaming routerson March 1, 2021 at 9:20 am
With Wi-Fi 6 support growing, and promising greater bandwidth to a greater number of devices, now is the perfect time to upgrade your old router with something a little smarter. Setting up the perfect ...
- ‘Why’ Is Always Crucial. Why It’s Not Time For Value Stockson February 28, 2021 at 4:00 pm
After a growth stock-dominated decade, value fans are crowing. Since November 6, world value stocks are up 19.
- Wifi Ultraboost Review - Is WiFi Ultra Boost any Good? [ Latest Update]on February 27, 2021 at 4:26 pm
If you are tired of it, then reading this WiFi Ultraboost review might be the essential task of the day for you. Why is it always that the WiFi works slower than usual or stops working when you are at ...
- Huge cache of explosive materials seized from Chennai-Mangalore Superfast Expresson February 25, 2021 at 7:11 pm
The suspicious consignment came to the notice of the RPF Crime Prevention and Detection Squad during their flash inspection ...
- Monstrous, superfast black hole can tell us how dead stars morph into such beastson February 25, 2021 at 6:53 pm
“It is the mass of the black hole that is most problematic,” Miller-Jones, who led a study recently published in Science, told SYFY WIRE. “Our current best theoretical models suggest that in the Milky ...
- Tiger Woods near-fatal car accident: A timeline of the events that led to the horrific roll-over crashon February 23, 2021 at 8:55 pm
Woods was reportedly in an 'agitated and impatient' state as he sped off from the hotel premises, minutes before the crash ...
- Ultrafast Laser Market Size, Industry Growth, Comprehensive Analysis, Development Strategy, Competitive Landscape, Regional Trends and Outlook 2023on February 22, 2021 at 10:08 am
Market Research Future published a research report on "Ultrafast Laser Market Research Report- Forecast to 2023" - ...
- 5G in the US is disappointing right now, but it’s going to get betteron February 22, 2021 at 8:33 am
Verizon hasn’t been alone in fueling the 5G hype machine; AT&T and T-Mobile have been talking up their 5G networks for years. Now, it’s showtime. With major flagship phones and a lot more budget ...
via Bing News