Using nanometer-scale components, researchers have demonstrated the first optical rectenna, a device that combines the functions of an antenna and a rectifier diode to convert light directly into DC current.
Potential to achieve 40 percent broad spectrum efficiency . . .
Based on multiwall carbon nanotubes and tiny rectifiers fabricated onto them, the optical rectennas could provide a new technology for photodetectors that would operate without the need for cooling, energy harvesters that would convert waste heat to electricity – and ultimately for a new way to efficiently capture solar energy.
In the new devices, developed by engineers at the Georgia Institute of Technology, the carbon nanotubes act as antennas to capture light from the sun or other sources. As the waves of light hit the nanotube antennas, they create an oscillating charge that moves through rectifier devices attached to them. The rectifiers switch on and off at record high petahertz speeds, creating a small direct current.
Billions of rectennas in an array can produce significant current, though the efficiency of the devices demonstrated so far remains below one percent. The researchers hope to boost that output through optimization techniques, and believe that a rectenna with commercial potential may be available within a year.
“We could ultimately make solar cells that are twice as efficient at a cost that is ten times lower, and that is to me an opportunity to change the world in a very big way” said Baratunde Cola, an associate professor in the George W. Woodruff School of Mechanical Engineering at Georgia Tech. “As a robust, high-temperature detector, these rectennas could be a completely disruptive technology if we can get to one percent efficiency. If we can get to higher efficiencies, we could apply it to energy conversion technologies and solar energy capture.”
The research, supported by the Defense Advanced Research Projects Agency (DARPA), the Space and Naval Warfare (SPAWAR) Systems Center and the Army Research Office (ARO), was reported September 28 in the journal Nature Nanotechnology.
Developed in the 1960s and 1970s, rectennas have operated at wavelengths as short as ten microns, but for more than 40 years researchers have been attempting to make devices at optical wavelengths. There were many challenges: making the antennas small enough to couple optical wavelengths, and fabricating a matching rectifier diode small enough and able to operate fast enough to capture the electromagnetic wave oscillations. But the potential of high efficiency and low cost kept scientists working on the technology.
“The physics and the scientific concepts have been out there,” said Cola. “Now was the perfect time to try some new things and make a device work, thanks to advances in fabrication technology.”
The Latest on: Optical Rectenna
via Google News
The Latest on: Optical Rectenna
- Millimeter-wave multi-mode circular antenna array for uni-cast multi-cast and OAM communicationon March 2, 2021 at 8:39 am
This paper investigates uni-/multi-cast and orbital angular momentum (OAM) mode data transmission in orthogonal directions by the utilization of a new circular antenna array, operating at 28 GHz ...
- ARMing A Breadboard — Everyone Should Program An ARMon February 27, 2021 at 4:00 pm
I’m always a little surprised that we don’t see more ARM-based projects. Of course, we do see some, but the volume isn’t what I’d expect given that low-level ARM chips are cheap, capable ...
- Quantum Solar Power Corpon February 26, 2021 at 5:10 pm
When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
- Rectenna Market 2021, Global Industry Size, Technology Trends, Top Company Share, Business Growth, SWOT Analysis, Regional Forecast to 2024on February 17, 2021 at 3:04 pm
Market Research Future, in its latest study, summed neatly that the global rectenna market 2020 could witness much ...
- research and developmenton February 9, 2021 at 4:01 pm
Using nanometer-scale components, researchers have demonstrated the first optical rectenna, a device that combines the functions of an antenna and a rectifier diode to convert light directly into ...
- Can solar power be beamed from space?on November 20, 2017 at 2:02 pm
Low-orbiting satellites, as proposed for Palau, would pass over once every 90 minutes or so, transmitting power to a rectenna for perhaps five minutes, requiring long-term battery storage or immediate ...
- 2-GHz Dual Diode Dipole Rectenna For Wireless Power Transmissionon November 19, 2017 at 12:06 pm
The key component for this type of wireless power transfer is the rectenna. A rectenna is a combination of a rectifying circuit and an antenna. The antenna receives the electromagnetic power and ...
- International Journal of Microwave and Optical Technology (IJMOT)on October 12, 2017 at 4:48 pm
White Papers · Mar 2013 · Provided By International Journal of Microwave and Optical Technology (IJMOT) Wireless power transmission is an important issue since it has broad technology impact in ...
- Alan T. Waterman Award Recipients,on July 12, 2014 at 5:55 pm
"For significant contributions in the field of innovative materials and transport phenomena through carbon nanotube arrays to include the first optical rectenna, the first thermally conductive ...
via Bing News