Most people are familiar with the concept of RADAR. Radio frequency (RF) waves travel through the atmosphere, reflect off of a target, and return to the RADAR system to be processed. The amount of time it takes to return correlates to the object’s distance.
As reported in the current issue of the journal Nature, DARPA researchers have recently demonstrated the most complex 2-D optical phased array ever. The array, which has dimensions of only 576µm x 576µm, roughly the size of the head of a pin, is composed of 4,096 (64 x 64) nanoantennas integrated onto a silicon chip. Key to this breakthrough was developing a design that is scalable to a large number of nanoantennas, developing new microfabrication techniques, and integrating the electronic and photonic components onto a single chip.
“Integrating all the components of an optical phased array into a miniature 2-D chip configuration may lead to new capabilities for sensing and imaging,” said Sanjay Raman, program manager for DARPA’s Diverse Accessible Heterogeneous Integration (DAHI) program. “By bringing such functionality to a chip-scale form factor, this array can generate high-resolution beam patterns — a capability that researchers have long tried to create with optical phased arrays. This chip is truly an enabling technology for a host of systems and may one day revolutionize LADAR in much the same way that ESAs revolutionized RADAR. Beyond LADAR, this chip may have applications for biomedical imaging, 3D holographic displays and ultra-high-data-rate communications.”
This work was supported by funding from DARPA’s Short-Range, Wide Field-of-View Extremely agile, Electronically Steered Photonic Emitter (SWEEPER) program under Josh Conway, and the Electronic-Photonic Heterogeneous Integration (E-PHI) thrust of the DAHI program. Future steps include integrating non-silicon laser elements with other photonic components and silicon-based control and processing electronics directly on-chip using E-PHI technologies currently under development.
DARPA Public Affairs | EurekAlert!
Theory of the strong interaction verified
27.03.2015 | Forschungszentrum Juelich
Dark matter even darker than once thought
27.03.2015 | ESA/Hubble Information Centre
In an experiment at the Department of Energy's SLAC National Accelerator Laboratory, scientists precisely measured the temperature and structure of aluminum as...
The IPH presents a solution at HANNOVER MESSE 2015 to make ship traffic more reliable while decreasing the maintenance costs at the same time. In cooperation with project partners, the research institute from Hannover, Germany, has developed a sensor system which continuously monitors the condition of the marine gearbox, thus preventing breakdowns. Special feature: the monitoring system works wirelessly and energy-autonomously. The required electrical power is generated where it is needed – directly at the sensor.
As well as cars need to be certified regularly (in Germany by the TÜV – Technical Inspection Association), ships need to be inspected – if the powertrain stops...
When an earthquake hits, the faster first responders can get to an impacted area, the more likely infrastructure--and lives--can be saved.
The Atlantic overturning is one of Earth’s most important heat transport systems, pumping warm water northwards and cold water southwards. Also known as the Gulf Stream system, it is responsible for the mild climate in northwestern Europe.
Scientists now found evidence for a slowdown of the overturning – multiple lines of observation suggest that in recent decades, the current system has been...
Because they are regularly subjected to heavy vehicle traffic, emissions, moisture and salt, above- and underground parking garages, as well as bridges, frequently experience large areas of corrosion. Most inspection systems to date have only been capable of inspecting smaller surface areas.
From April 13 to April 17 at the Hannover Messe (hall 2, exhibit booth C16), engineers from the Fraunhofer Institute for Nondestructive Testing IZFP will be...
25.03.2015 | Event News
19.03.2015 | Event News
17.03.2015 | Event News
27.03.2015 | Agricultural and Forestry Science
27.03.2015 | Materials Sciences
27.03.2015 | Ecology, The Environment and Conservation