Navigation Links
Boston College researchers' unique nanostructure produces novel 'plasmonic halos'
Date:2/7/2013

CHESTNUT HILL, MA (February 7, 2013) Using the geometric and material properties of a unique nanostructure, Boston College researchers have uncovered a novel photonic effect where surface plasmons interact with light to form "plasmonic halos" of selectable output color. The findings appear in the journal Nano Letters.

The novel nanostructure proved capable of manipulating electron waves known as surface plasmon polaritons, or SPPs, which were discovered in the 1950s but of late have garnered the attention of scientists for their potential applications in fields that include waveguiding, lasing, color filtering and printing.

The team put a layer of a polymer film on a glass substrate and then dotted the surface with holes precisely defined by a process of electron beam lithography, using the BC Integrated Sciences Nanofabrication Clean Room facility. The team next applied a layer of silver, thick enough to be nontransparent to visible light. In addition to covering the thin film on top, the silver coated the contours of the holes in the film, as well as the exposed circles of the glass substrate below. The effect produced an array of silver microcavities.

When the researchers directed light from below and through the glass substrate, light "leaking" through nanoscale gaps on the perimeters of the microcavities created SPP waves on their top surfaces. At particular wavelengths of the incident light, these waves formed modes or resonances analogous to acoustic waves on a drumhead, which in turn effectively filtered the light transmitted to the far side, accounting for the "halo" appearance, said Boston College Ferris Professor of Physics Michael Naughton, who co-authored the report with Senior Research Associate Michael J. Burns and doctoral student and lead author Fan Ye. The team's research was funded by the W. M. Keck Foundation.

Central to this control effect are "step gaps" formed along the perimeter of each circle, which give the nanostructure the ability to modulate which waves of light pass through. It is within this geometry that the interaction of light upon the silver surface coating resulted in the excitation of plasmon waves, said Naughton. Examination of the SPPs by Mr. Ye using a near-field scanning optical microscope offered unique insights into the physics at work within the structure, Naughton said.

By adjusting the type of metal used to coat the structure or varying the circumferences of the microcavities, Naughton said the step-gap structure is capable of manipulating the optical properties of the device in the visible light range, giving the researchers newfound control in light filtering.

This kind of control, the team reports, could have applications in areas such as biomedical plasmonics or discrete optical filtering.


'/>"/>

Contact: Ed Hayward
ed.hayward@bc.edu
617-552-4826
Boston College
Source:Eurekalert  

Related biology technology :

1. Boston Scientific to Webcast Conference Call Discussing Fourth Quarter and Full Year 2012 Financial Results on January 29th
2. Shire and Boston Childrens Hospital Enter Into Broad Research Collaboration
3. Boston Childrens Hospital announces international genomics competition winner
4. BioBDx to Present at the 2012 BioPharm America and AdvaMed MedTech Conferences in Boston
5. Alacrita Establishes U.S. Headquarters in Boston Area
6. Sanofi Signs Agreement for Type 1 Diabetes Research with Boston Academic Teaching Hospital
7. Cadence Pharmaceuticals To Present At The Deutsche Bank Securities, Inc. 37th Annual Health Care Conference In Boston On May 8, 2012
8. Regado Biosciences, Inc. to Present at the Cowen and Company 32nd Annual Health Care Conference in Boston, MA
9. University of College London Hospitals (UCLH) Selects GEO SCAN Medical as New Standard of Care for the Detection and Treatment of Prostate Cancer
10. Quest Diagnostics Clinical Trials Biorepository Accredited by the College of American Pathologists
11. The American College of Obstetricians and Gynecologists Committee on Genetics and the Society for Maternal-Fetal Medicine Publications Committee Recommend Noninvasive Prenatal Testing for Fetal Aneuploidy
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Boston College researchers' unique nanostructure produces novel 'plasmonic halos'
(Date:4/22/2020)... ... April 21, 2020 , ... Aniara Diagnostica is pleased to ... Aniara Diagnostica, a multi-national distributor of diagnostic and research agents, as well as ... quality and cost-efficient delivery. , For Research Use Only. Not for ...
(Date:4/18/2020)... ... April 17, 2020 , ... NeuroFlow ... Research (SBIR) program to support the expansion of its digital health platform enabling ... conducts a rigorous merit-based review process, adds to NeuroFlow’s recent government awards ...
(Date:4/7/2020)... YARDLEY, Pa. (PRWEB) , ... April 06, 2020 ... ... performance, and process solutions for the life sciences industry, has announced the release ... situation developing quickly, our top priority is the health and safety of our ...
(Date:4/1/2020)... ... March 30, 2020 , ... A joint venture between mobile ... earlier this year to bring telehealth to various government agencies, has now focused ... officials are currently?awaiting an Emergency Use Authorization (EUA) waiver from the FDA?to?perform?AI?testing in ...
Breaking Biology Technology:
(Date:5/14/2020)... ... May 12, 2020 , ... ... helps Life Science Manufacturers accurately and easily project contracted liabilities with payers, ... Gross-to-Net models by projecting discounts/rebates to Commercial and Government entities, Copay and ...
(Date:5/14/2020)... ... May 14, 2020 , ... ... for medical sales representatives, found the 2019 average medical sales rep total compensation ... being shadowed by uncertainties amid the COVID-19 global crisis. , The MedReps 2020 ...
(Date:5/6/2020)... HANOVER, Md. and LEXINGTON, Mass. (PRWEB) , ... May 06, 2020 ... ... Hemanext Inc. , a privately held medical technology company dedicated to improving the ... to announce a new partnership that will help SCDAA deliver on its mission and ...
Breaking Biology News(10 mins):