Navigation Links
Columbia engineers make world's smallest FM radio transmitter
Date:11/18/2013

New York, NYNovember 17, 2013A team of Columbia Engineering researchers, led by Mechanical Engineering Professor James Hone and Electrical Engineering Professor Kenneth Shepard, has taken advantage of graphene's special propertiesits mechanical strength and electrical conductionand created a nano-mechanical system that can create FM signals, in effect the world's smallest FM radio transmitter. A team of Columbia Engineering researchers, led by Mechanical Engineering Professor James Hone and Electrical Engineering Professor Kenneth Shepard, has taken advantage of graphene's special propertiesits mechanical strength and electrical conductionand created a nano-mechanical system that can create FM signals, in effect the world's smallest FM radio transmitter. The study [http://dx.doi.org/ - DOI 10.1038/nnano.2013.232] is published online on November 17, in Nature Nanotechnology.

"This work is significant in that it demonstrates an application of graphene that cannot be achieved using conventional materials," Hone says. "And it's an important first step in advancing wireless signal processing and designing ultrathin, efficient cell phones. Our devices are much smaller than any other sources of radio signals, and can be put on the same chip that's used for data processing."

Graphene, a single atomic layer of carbon, is the strongest material known to man, and also has electrical properties superior to the silicon used to make the chips found in modern electronics. The combination of these properties makes graphene an ideal material for nanoelectromechanical systems (NEMS), which are scaled-down versions of the microelectromechanical systems (MEMS) used widely for sensing of vibration and acceleration. For example, Hone explains, MEMS sensors figure out how your smartphone or tablet is tilted to rotate the screen.

In this new study, the team took advantage of graphene's mechanical 'stretchability' to tune the output frequency of their custom oscillator, creating a nanomechanical version of an electronic component known as a voltage controlled oscillator (VCO). With a VCO, explains Hone, it is easy to generate a frequency-modulated (FM) signal, exactly what is used for FM radio broadcasting. The team built a graphene NEMS whose frequency was about 100 megahertz, which lies right in the middle of the FM radio band (87.7 to 108 MHz). They used low-frequency musical signals (both pure tones and songs from an iPhone) to modulate the 100 MHz carrier signal from the graphene, and then retrieved the musical signals again using an ordinary FM radio receiver.

"This device is by far the smallest system that can create such FM signals," says Hone.

While graphene NEMS will not be used to replace conventional radio transmitters, they have many applications in wireless signal processing. Explains Shepard, "Due to the continuous shrinking of electrical circuits known as 'Moore's Law', today's cell phones have more computing power than systems that used to occupy entire rooms. However, some types of devices, particularly those involved in creating and processing radio-frequency signals, are much harder to miniaturize. These 'off-chip' components take up a lot of space and electrical power. In addition, most of these components cannot be easily tuned in frequency, requiring multiple copies to cover the range of frequencies used for wireless communication."

Graphene NEMS can address both problems: they are very compact and easily integrated with other types of electronics, and their frequency can be tuned over a wide range because of graphene's tremendous mechanical strength.

"There is a long way to go toward actual applications in this area," notes Hone, "but this work is an important first step. We are excited to have demonstrated successfully how this wonder material can be used to achieve a practical technological advancementsomething particularly rewarding to us as engineers."

The Hone and Shepard groups are now working on improving the performance of the graphene oscillators to have lower noise. At the same time, they are also trying to demonstrate integration of graphene NEMS with silicon integrated circuits, making the oscillator design even more compact.


'/>"/>

Contact: Holly Evarts
holly.evarts@columbia.edu
347-453-7408
Columbia University
Source:Eurekalert

Related biology technology :

1. Genia Technologies, Columbia University, and Harvard University Awarded $5.25 Million Grant from NIH to Accelerate the Development of NanoTag DNA Sequencing Technology
2. Dr. Szczepan Baran will be Presenting at the International Microsurgical Simulation Society at Columbia University in New York
3. Columbias Nursing School Launches "Keep It Clean for Kids" (KICK)
4. IEEE-USA & DuPont Will Lead 2014 U.S. Engineers Week Activities
5. Wayne State receives National Science Foundation grant for training future nanoengineers
6. Engineers fine-tune the sensitivity of nano-chemical sensor
7. Forget about leprechauns, engineers are catching rainbows
8. Cornell bioengineers discover the natural switch that controls spread of breast cancer cells
9. UT Arlington engineers working to prevent heat buildup within 3D integrated circuits
10. UCLA engineers develop new energy-efficient computer memory using magnetic materials
11. Engineers achieve longstanding goal of stable nanocrystalline metals
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/11/2017)... -- VMS BioMarketing, a leading provider of patient support solutions, has ... (CNE) network, which will launch this week. The VMS CNEs ... professionals to enhance the patient care experience by delivering peer-to-peer ... care professionals to help women who have been diagnosed and ... ...
(Date:10/10/2017)... ... October 10, 2017 , ... San Diego-based team building ... corporate rebranding initiative announced today. The bold new look is part of a ... company moves into a significant growth period. , It will also expand its service ...
(Date:10/10/2017)... SANTA CRUZ, Calif. , Oct. 10, 2017 /PRNewswire/ ... SBIR grant from the NIH to develop RealSeq®-SC (Single ... preparation kit for profiling small RNAs (including microRNAs) from ... Cell Analysis Program highlights the need to accelerate development ... "New techniques for ...
(Date:10/9/2017)... ... ... At its national board meeting in North Carolina, ARCS® Foundation President ... and Astronomy, has been selected for membership in ARCS Alumni Hall of Fame ... Prize in Fundamental physics for the discovery of the accelerating expansion of the universe, ...
Breaking Biology Technology:
(Date:6/30/2017)... 30, 2017 Today, American Trucking Associations ... of face and eye tracking software, became the ... program. "Artificial intelligence and advanced ... monitor a driver,s attentiveness levels while on the ... to detect fatigue and prevent potential accidents, which ...
(Date:5/16/2017)... N.J. , May 16, 2017  Veratad Technologies, ... provider of online age and identity verification solutions, announced ... K(NO)W Identity Conference 2017, May 15 thru May 17, ... Regan Building and International Trade Center. ... the globe and in today,s quickly evolving digital world, ...
(Date:4/19/2017)... 2017 The global military biometrics ... marked by the presence of several large global players. ... five major players - 3M Cogent, NEC Corporation, M2SYS ... nearly 61% of the global military biometric market in ... global military biometrics market boast global presence, which has ...
Breaking Biology News(10 mins):