Featured Research

from universities, journals, and other organizations

Towards Cloaking Visible Light: Three-dimensional Metamaterials For The Optical Wavelength Range

Date:
December 24, 2007
Source:
University of Stuttgart
Summary:
Last year researchers from Duke University stunned the world when they announced a cloaking device for the microwave range. This device made use of metamaterials that had a negative refractive index for electromagnetic radiation. The metamaterials were carefully designed split-ring resonators with a structure size much smaller than the wavelength. Only 10 stacked layers of metamaterials were necessary to achieve the desired invisibility effect. Now researchers have succeeded in manufacturing a stacked split-ring metamaterial for the optical wavelength range.

3D metamaterials. Gold nano split ring resonators are stacked.
Credit: Stuttgart University/ MPI

Last year researchers from Duke University stunned the world when they announced a cloaking device for the microwave range. This device made use of metamaterials that had a negative refractive index for electromagnetic radiation. The metamaterials were carefully designed split-ring resonators with a structure size much smaller than the wavelength. Only 10 stacked layers of metamaterials were necessary to achieve the desired invisibility effect.

Related Articles


Now, researchers from the group of Harald Giessen at the University of Stuttgart have succeeded in manufacturing a stacked split-ring metamaterial for the optical wavelength range. This layer-by-layer stacking procedure, which can be repeated as often as desired, is capable of producing well aligned three-dimensional metamaterial structures.

The key to this achievement was a planarization method for the rough nanolithography surface in combination with robust alignment marks which survived the dry etching processes during nanofabrication. This resulted in perfect lateral alignment as well as in perfectly flat layers. The method is suited to produce arbitrary shapes in each layer as well. Thus, more complex structures such as twisted or chiral structures are possible.

The present 3D structures consist of horseshoe-shaped gold nanowires that are arranged in a square pattern and perfectly stacked above each other. Due to the strong vertical coupling, broadband optical features arise. Also, the vertical coupling leads to negative permeability of the structure, which is a prerequisite for a negative refractive index.

Possible applications in the future include perfect lenses that beat the diffraction limit, and optical cloaking devices which provide some invisibility for macroscopic objects.

Na Liu et al., Nature Materials Jan. 2008 issue, Advance Online Publication.


Story Source:

The above story is based on materials provided by University of Stuttgart. Note: Materials may be edited for content and length.


Cite This Page:

University of Stuttgart. "Towards Cloaking Visible Light: Three-dimensional Metamaterials For The Optical Wavelength Range." ScienceDaily. ScienceDaily, 24 December 2007. <www.sciencedaily.com/releases/2007/12/071221231539.htm>.
University of Stuttgart. (2007, December 24). Towards Cloaking Visible Light: Three-dimensional Metamaterials For The Optical Wavelength Range. ScienceDaily. Retrieved March 5, 2015 from www.sciencedaily.com/releases/2007/12/071221231539.htm
University of Stuttgart. "Towards Cloaking Visible Light: Three-dimensional Metamaterials For The Optical Wavelength Range." ScienceDaily. www.sciencedaily.com/releases/2007/12/071221231539.htm (accessed March 5, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Thursday, March 5, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Did the Simpsons Figure out the Higgs Boson Particle Years Before Scientists

Did the Simpsons Figure out the Higgs Boson Particle Years Before Scientists

Buzz60 (Mar. 4, 2015) During a 1998 Simpsons episode, Homer Simpson scribbled a seemingly gibberish equation on a chalkboard. Turns out that equation is a shake off from predicting the actual nano mass of the God Particle. Patrick Jones (@Patrick_E_Jones) explains. Video provided by Buzz60
Powered by NewsLook.com
Wearables Now the Must-Haveables

Wearables Now the Must-Haveables

Reuters - Business Video Online (Mar. 3, 2015) Telecom company executives are meeting in Barcelona for the Mobile World Congress, the largest annual trade show for the wireless industry. As Ivor Bennett reports from the show wearable technology is one of the big themes. Video provided by Reuters
Powered by NewsLook.com
Forensic Holodeck Creates 3D Crime Scenes

Forensic Holodeck Creates 3D Crime Scenes

Reuters - Innovations Video Online (Mar. 3, 2015) A holodeck is no longer the preserve of TV sci-fi classic Star Trek, thanks to researchers from the Institute of Forensic Medicine Zurich, who have created what they say is the first system in the world to visualise the 3D data of forensic scans. Jim Drury saw it in operation. Video provided by Reuters
Powered by NewsLook.com
Solar Plane Passes New Test Ahead of World Tour

Solar Plane Passes New Test Ahead of World Tour

AFP (Mar. 2, 2015) A solar-powered plane made a third successful test flight in the United Arab Emirates on Monday ahead of a planned round-the-world tour to promote alternative energy. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins