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:11/12/2019)... Brooklyn, NY (PRWEB) , ... November 12, 2019 ... ... thorough awareness campaign ever to educate Americans about the deadly healthcare-associated infection C. ... personal videos featuring survivors of the epidemic, which kills at least 30,000 people ...
(Date:11/5/2019)... ... , ... Focal Healthcare , an innovator of image-guided ... 2.0 prostate fusion biopsy solution. By combining information from multiparametric MRI (mpMRI) with ... across Europe the ability to perform targeted transrectal and transperineal prostate biopsies. , ...
(Date:10/30/2019)... , ... October 30, 2019 , ... While using cold ... and students at South Dakota School of Mines & Technology are exploring ... leaving healthy cells alive. , If successful, the technique would prove to be ...
(Date:10/26/2019)... ... , ... Sparks Marketing Group, Inc. (Sparks) announced ... healthcare-specific marketing firm, to strengthen the agency’s growing focus on the healthcare vertical ... in pharma, bio-therapeutics, medical device and healthcare technologies currently account for a large ...
Breaking Biology Technology:
(Date:11/12/2019)... ... November 12, 2019 , ... ... the design and manufacturer of technical ergonomic seating solutions, announced this week ... with Healthier Hospital Initiative guidelines. Established by Practice Greenhealth, a health care ...
(Date:11/12/2019)... ... November 12, 2019 , ... Atlantic Ultraviolet Corporation (AUV), the ... distributors voted their patented automatic and manual wipers the #1 best feature of ... frequent maintenance task required of an ultraviolet water purifier is quartz sleeve cleaning. ...
(Date:11/9/2019)... (PRWEB) , ... November 08, ... ... Alizée Pathology to form the leading provider of specialized histology, pathology, biomarker ... industries. StageBio was recently created by the mergers of Histo-Scientific Research Laboratories ...
Breaking Biology News(10 mins):