Researchers at Northeastern University today announced that they have been able to demonstrate the unique feature of imaging through a flat lens. Using the phenomenon of negative refraction through a novel photonic crystal, Northeastern physicists observed that a flat slab of such material behaves as a lens and focuses electromagnetic waves at microwave frequencies to produce a real image.
The research, published in tomorrow’s edition of the journal Nature, represents an important advance in the field of imaging. The lead author on the article, “Imaging by Flat Lens Using Negative Refraction,” is Srinivas Sridhar, Ph.D., from the department of physics and the Electronic Materials Institute at Northeastern. Contributors also include NU researchers Patanjali Parimi, Ph.D., Wentao Lu, Ph.D., and Plarenta Vodo.
"The significance of this research is that, for the first time, we have been able to image using a flat surface by employing a special material fabricated from a photonic crystal, which possesses a negative index of refraction,” said Sridhar. “Conventional materials, like glass or Teflon, possess positive indices of refraction and, in order to focus light or microwaves with them, you need to have a curved surface. When the concept of negative refraction emerged about 30 years ago, its most striking proposal was the notion that you could form an image using flat rather than curved surfaces. This research not only demonstrated this to be true but is a significant achievement toward the realization of several applications in imaging such as the concept of a ‘superlens’ with vastly improved power of resolution. ”
Steve Sylven | Northeastern University
Tangled magnetic fields power cosmic particle accelerators
14.12.2018 | DOE/SLAC National Accelerator Laboratory
In search of missing worlds, Hubble finds a fast evaporating exoplanet
14.12.2018 | NASA/Goddard Space Flight Center
The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.
Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
14.12.2018 | Power and Electrical Engineering
14.12.2018 | Physics and Astronomy
14.12.2018 | Physics and Astronomy