Feeds

Fireflies donate gut feelings to LED research

Belly, belly, burning bright

Protecting against web application threats using SSL

Structures that help fireflies produce bright light from their abdominal lanterns have been mimicked in the lab to increase the efficiency of LEDs.

In their Optical Express article, the researchers explain that the jagged structures they found on the Photuris Lampyridae firefly enhanced the glow of their lanterns. By creating an overlayer that mimicked these structures, the boffins say they extracted 55 percent more light from LEDs in the lab.

As the French/Belgian/Canadian authors note, the overlayer “can be tailored to an existing diode design rather than requiring a complete redesign of the diode geometry”, which would greatly simplify real-world implementation of the technique.

The structure of the abdomen resembles a factory roof made up of chitinous scales, something easily replicated with a photoresistant material deposited on top of a GaN (gallium nitride) LED.

From left, the firefly; the natural scale structure; and the artificial structure.

Source: Optics Express

Compared to a planar surface, the researchers explain, the jagged structure improves light extraction by minimizing internal reflections – a problem common both to the firefly and to LED design.

University of Namur doctoral student Annick Bay told UPI: “What's nice about our technique is that it's an easy process and we don't have to create new LEDs. With a few more steps we can coat and laser pattern an existing LED.”

As noted in the journal article:

“The fabrication technique applied in order to obtain corrugated overlayer has the advantages of simplicity and scalability: a homogeneous layer of photosensitive resist is first deposited by spin coating on the whole surface of the wafer and left to harden; then, on each diode, appropriate radiation penetrates the photoresist to a depth proportional to intensity, the illuminated region being then easily removed. This technique allows for the production of any profile on a precise area of a large surface.” ®

Reducing the cost and complexity of web vulnerability management

More from The Register

next story
PORTAL TO ELSEWHERE scried in small galaxy far, far away
Supermassive black hole dominates titchy star formation
Boffins say they've got Lithium batteries the wrong way around
Surprises at the nano-scale mean our ideas about how they charge could be all wrong
Edge Research Lab to tackle chilly LOHAN's final test flight
Our US allies to probe potential Vulture 2 servo freeze
Europe prepares to INVADE comet: Rosetta landing site chosen
No word yet on whether backup site is labelled 'K'
Cracked it - Vulture 2 power podule fires servos for 4 HOURS
Pixhawk avionics juice issue sorted, onwards to Spaceport America
Archaeologists and robots on hunt for more Antikythera pieces
How much of the world's oldest computer can they find?
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
The next step in data security
With recent increased privacy concerns and computers becoming more powerful, the chance of hackers being able to crack smaller-sized RSA keys increases.