Terahertz-controlling device is built

Dec 04, 2006

U.S. government scientists say they've built a device that can manipulate terahertz radiation, perhaps leading to new imaging and communications devices.

The terahertz, or THz, range of the frequency spectrum lies between infrared and microwave wavelengths. Devices generating and detecting THz radiation are in development but techniques to control the waves are lagging.

But Hou-Tong Chen and colleagues at the Los Alamos National Laboratory have demonstrated metamaterials -- objects with properties based on their structure instead of the materials they are composed of -- can be designed to efficiently control THz waves in real time.

The researchers said they have built a device that consists of a semiconductor substrate with an array of gold structures on top. By controlling the voltage that is applied between the substrate and the metamaterial, the team can modulate the transmitted intensity up to 50 percent.

They said their demonstration exceeds the performance of existing electrical THz modulators and it's hoped the efficiency will be improved further by optimizing the device.

The experiment is detailed in the current issue of the journal Nature.

Copyright 2006 by United Press International

Explore further: X-ray powder diffraction beamline at NSLS-II takes first beam and first data

add to favorites email to friend print save as pdf

Related Stories

A terahertz generator with the highest signal quality

Dec 16, 2013

Researchers at the Universidad Carlos III of Madrid (UC3M) and the firm Luz WaveLabs are developing an innovative Terahertz generator that improves signal quality by one million times as compared to the best ...

Nanodevices for a 'More than Moore' world

Oct 04, 2013

Moore's Law - which holds that the number of transistors on an integrated circuit, and hence its processing power, doubles every 18 months - has been the guiding principal of chip design for almost half a ...

Recommended for you

Particles, waves and ants

Nov 26, 2014

Animals looking for food or light waves moving through turbid media – astonishing similarities have now been found between completely different phenomena.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.