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The mosquito laser is a device invented by astrophysicist Lowell Wood to kill large numbers of mosquitoes to reduce the chance of people being infected with malaria. Although originally introduced in the early 1980s, the idea was not substantially researched until decades later. In 2007, the Bill & Melinda Gates Foundation requested Intellectual Ventures LLC to find a way to fight and eventually end malaria. Intellectual Ventures resurrected the idea of using lasers to kill mosquitoes and now has a working prototype. The idea has been criticized because most areas where malaria is prevalent do not have reliable electrical power.
At a brainstorming session in 2007, to think of solutions for malaria, Wood, one of the architects of the Strategic Defense Initiative (SDI), also known as “Star Wars,” suggested designing a system to kill mosquitoes with lasers. Soon after, the idea was followed up by many scientists at Intellectual Ventures and mosquitoes were being shot down within a year.
The original idea incorporates laser technology that stems from the SDI, scaled down to insects. Although the malaria-carrying parasite is gone from most developed nations, it is getting worse in undeveloped countries, and it is also becoming more resistant to drugs. Rather than continue with drugs or other pesticides, the mosquito laser takes a more direct approach by instantly killing mosquitoes or burning off their wings and rendering them harmless. One of the design goals was to minimize collateral damage to other species and the environment.
The laser, humorously referred to by some as a WMD (Weapon of Mosquito Destruction), works effectively at a range of 100 feet (approx. 30 meters). Although the team at Intellectual Ventures is confident in the effectiveness of the laser, they do not expect it to eliminate malaria altogether. They believe several technologies must be combined for maximum eradication and minimal cost.
The team includes several scientists that previously worked at Lawrence Livermore National Laboratory. Wood worked with Teller, the father of the hydrogen bomb, and architect of the SDI anti-missile Laser program. Currently there are several scientists involved with the project, including scientist Jordin Kare, PhD, and principal investigator Eric Johanson (Eric) . These scientists’ knowledge spans several fields; the scientists include engineers, an insect physiologist, an optical specialist, a computational modeling scientist, and an epidemiologist.
Several concepts were explored, considering cost and efficiency. Devised implementations included a hand-held model, flying drones, and the current prototype, the Photonic Fence. As of early 2008, Intellectual Venture's prototype consisted of a hand-held laser, capable of shooting down mosquitoes in limited numbers. The Intellectual Ventures scientists once suggested attaching a mosquito laser system to a small flying drone so that it could patrol the air. The current prototype idea being pursued is a perimeter based implementation known as the Photonic Fence.
The device works by using infra-red light-emitting diode (LED) lamps on a fence post to create a field of light. This field of light reflects from retroreflective material on another fence post, much like that used on roads and highway signs, and bounces back to its source. This field of light is monitored by charge-coupled devices (CCDs) similar to the ones used in consumer digital cameras. These cameras are situated on both fence posts and detect shadows in the light between the posts. Once an insect is detected, a non-lethal laser is fired at it. This non-lethal laser is used to determine the size of the insect, and the frequency at which its wings are beating.
The information gathered by the non-lethal laser can be used to determine the type of insect, and even its gender because wing beat patterns are unique to each species and gender. This is important in preventing malaria because only female mosquitoes bite humans. Also, only mosquitoes of the genus Anopheles carry the malaria-causing parasite of the genus plasmodium. All of these determining calculations are done using a custom image processing board using software written specifically for this application. Once the software confirms that the insect is of the targeted species and gender, a safety check makes sure that nothing is in the way of the laser and the mosquito. Once this safety check is completed, the lethal laser is given permission to shoot.
The lethal laser could be one of several low-power consumer lasers, but blue lasers, similar to the ones found in Blu-ray players, are thought to have great potential. Blue lasers are preferable as higher powered ones are more available than red, and cheaper due to them being used in the Blu-ray industry. The lethal laser is fired at the mosquito and is able to kill it mid-flight. The exact reason for the mosquito’s death is unknown, but it is likely that the mosquito simply overheats and dies. In a video published by Intellectual Ventures, the mosquito's wings appear to wither, shrivel up and the body drops to the floor, often motionless. Jordin Kare has published instructions on how to build a DIY photonic fence. Eric Johanson published information about the history of the device and how the system works in Make Magazine Issue 23.
The Photonic Fence is thought to be best deployed surrounding buildings, such as hospitals and schools, or even whole villages, in an effort to reduce the spread of malaria. According to Nathan Myhrvold, co-founder of Intellectual Ventures, the Photonic Fence can kill up to 50 to 100 mosquitoes a second, at a maximum range of 100 ft.
The Photonic Fence can be manufactured from parts used in current generation consumer technology and is projected to be relatively low cost. Myhrvold believes it can be made for around $50 per unit; however, Intellectual Ventures does not intend to manufacture the units, but rather to come up with a final design. The prototype of the fence was built with parts bought on eBay. All three stages of the photonic fence can be made from this consumer technology. When the device is looking for mosquitoes that pass its field of vision, it uses basic infra-red LEDs, and light sensors from modern digital cameras. To target and kill the mosquitoes it uses similar laser technology found in optical devices such as DVD, or Blu-ray disc drives.
Environmental and ecological concerns
The collateral damage to the non-malaria-carrying insect population from the Photonic Fence is thought to be low. Since the system can rapidly determine its target by wing beat frequency, it can be set to target only the female mosquitoes, who are the carriers of malaria in certain species of mosquitoes. Furthermore, this distinction allows it to avoid species of insects which don't spread disease, such as bees. The risk for collateral damage is minimized because the prototype checks the target and the kill-laser is barely strong enough to destroy mosquito tissue. The laser, as a replacement for pesticides, does not cause widespread environmental damage that pesticides do.
Although there has been positive public reaction, experts have expressed doubts as to the effectiveness of the Photonic Fence in the field. According to Bart Knols, a mosquito and malaria expert, the system would not work because of high cost and troubles with electrical power in Africa. The Photonic Fence has only been used in a lab setting.
At the same time, perhaps the advent of widespread availability of solar powered devices and high-power-density batteries makes this much more practical today.
- Guth 2009, p. ??.
- (MicrobiologyBytes, 2010)
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- http://online.wsj.com/article/SB123680870885500701.html The insects survived this particular test, which used a non-lethal laser. But if these researchers have their way, the Cold War missile-defense strategy will be reborn as a WMD: Weapon of Mosquito Destruction.
- (Johanson, 2010)
- (Intellectual Ventures Team, 2009)
- (Lee, 2010)
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- Mosquito killed by a Laser - YouTube
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