Navigation Links
Silver nanocubes make super light absorbers
Date:12/6/2012

DURHAM, N.C. -- Microscopic metallic cubes could unleash the enormous potential of metamaterials to absorb light, leading to more efficient and cost-effective large-area absorbers for sensors or solar cells, Duke University researchers have found.

Metamaterials are man-made materials that have properties often absent in natural materials. They are constructed to provide exquisite control over the properties of waves, such as light. Creating these materials for visible light is still a technological challenge that has traditionally been achieved by lithography, in which metallic patterns are etched onto an inert material, much like an ink-jet printer.

As effective as lithography has been in creating such structures, it does have a limitation it is very expensive and thus difficult to scale up to the large surface areas required for many applications.

"Our new approach is more of a bottom-up process," said Cristian Cirac, research scientist at Duke's Pratt School of Engineering. "It may allow us to create devices such as efficient solar panels that cover much larger areas. In our experiments, we demonstrated an extraordinarily simple method to achieve this."

The results of Cirac and co-workers' experiments, which were conducted in the laboratory of senior researcher David R. Smith, William Bevan Professor of electrical and computer engineering at Duke, were published Dec. 6 in the journal Nature.

For many applications or devices, the key is the material's ability to control the absorption of electromagnetic waves. Metals, for example, can be highly reflective on their own, which may be beneficial for some applications, but for something like a solar cell, optimal light absorption is desired.

"However, metamaterials based on metallic elements are particularly efficient as absorbers because both the electrical and magnetic properties of the material can be controlled by how we design them," Cirac said.

The new metamaterial developed by the Duke team has three major components a thin layer of gold film coated with a nano-thin layer of an insulator, topped off with a dusting of millions of self-assembled nanocubes. In the current experiments, the nanocubes were fabricated out of silver.

"The nanocubes are literally scattered on the gold film and we can control the properties of the material by varying the geometry of the construct," Cirac said. "The absorptivity of large surface areas can now be controlled using this method at scales out of reach of lithography."

While metals on their own tend to have reflective properties, the nanocubes act as tiny antennae that can cancel out the reflectance of the metal surface.S

"By combining different components of the metamaterial elements together into a single composite, more complicated reflectance spectra could be engineered, achieving a level of control needed in more exotic applications, such as dynamic inks," Cirac said.


'/>"/>

Contact: Richard Merritt
richard.merritt@duke.edu
919-660-8414
Duke University
Source:Eurekalert  

Related biology technology :

1. On the road to plasmonics with silver polyhedral nanocrystals
2. Researchers create highly conductive and elastic conductors using silver nanowires
3. Nanotechnology helps scientists keep silver shiny
4. NASA develops super-black material that absorbs light across multiple wavelength bands
5. Gated STED -- developing the next generation of super-resolution microscopes
6. SuperNova Diagnostics® to Present at the 23rd Annual Piper Jaffray Healthcare Conference in New York City
7. Celebrating 65 Years of Providing Superior Healthcare Products, Mission Pharmacal Continues to Thrive
8. SuperNova Diagnostics® to Present at Biotech Showcase™ 2012 During JP Morgan Healthcare Conference January 9 - 12
9. Superior Controls of Seabrook, NH Named System Integrator of the Year for 2012 by Control Engineering Magazine
10. Almost perfect: A breakthrough in superlens development
11. Supermaterial goes superpermeable
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Silver nanocubes make super light absorbers
(Date:4/25/2017)... ... April 25, 2017 , ... Franz Inc ., an ... tools, and market leader for Semantic Graph Database technology, today announced ... the most effective system for developing and deploying applications to solve the challenges ...
(Date:4/25/2017)... , April 25, 2017 ... has licensed its novel immune-modulating technology to an undisclosed ... and allergy. Tregitopes, pronounced T·rej·itopes, are ... immunoglobulin by EpiVax CEO Annie De Groot ... intravenous immunoglobulin G, an autoimmune disease therapy, Tregitopes ...
(Date:4/25/2017)... (PRWEB) , ... April 25, 2017 , ... ... Services and Metrology Partners.     , Covalent’s Analytical Services unit provides high-quality ... can be measured within 24 hours of receipt. There are no price premiums, ...
(Date:4/24/2017)... ... April 24, 2017 , ... ... denaturation in a cellular milieu; however, the broad application of this cellular target ... platforms with sensitive quantitative readouts. Cell-based thermal stabilization assays are valuable methods for ...
Breaking Biology Technology:
(Date:3/20/2017)... HANOVER, Germany , March 20, 2017 At ... Hamburg -based biometrics manufacturer DERMALOG. The Chancellor came to the ... Japan is this year,s CeBIT partner country. At the largest ... important biometrics in use: fingerprint, face and iris recognition as well as ... ...
(Date:3/16/2017)... 16, 2017 CeBIT 2017 - Against identity fraud with DERMALOG solutions ... ... Used combined in one project, multi-biometric solutions provide a crucial contribution against ... Used combined in one project, ... ...
(Date:3/9/2017)... March 9, 2017 4Dx has publicly released ... Imaging Workshop at the University of Pennsylvania. Founder and ... deliver the latest data to world leaders in lung ... together leaders at the forefront of the industry to ... "The quality of the imaging is ...
Breaking Biology News(10 mins):