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:4/26/2017)... ... 26, 2017 , ... WonderWorks, Myrtle Beach’s science focused amusement ... of deep space exploration and inspire space enthusiasts. The exhibit features interactive exhibits ... guest appearance by former Shuttle Astronaut Don Thomas. , The intergalactic weekend kicks ...
(Date:4/26/2017)... ... April 26, 2017 , ... As the call ... healthcare industry stakeholders, the discussion surrounding the topic will continue at WEDI 2017- ... in Los Angeles, Calif. Hosted by the Workgroup for Electronic Data Interchange (WEDI), ...
(Date:4/25/2017)... R.I. , April 25, 2017 ... Inc. ("EpiVax") has licensed its novel immune-modulating technology to ... autoimmune disease and allergy. Tregitopes, pronounced ... in human immunoglobulin by EpiVax CEO Annie ... Similar to intravenous immunoglobulin G, an autoimmune disease ...
(Date:4/24/2017)... , April 24, 2017  Dante Labs announced today the ... EUR 850 (ca. $900). While American individuals have been able ... time Europeans can access WGS below EUR 1,000. ... to leveraging genetic information to make informed decisions about disease ... ...
Breaking Biology Technology:
(Date:4/5/2017)... , April 5, 2017  The Allen Institute for ... Cell Explorer: a one-of-a-kind portal and dynamic digital window ... imaging data, the first application of deep learning to ... stem cell lines and a growing suite of powerful ... for these and future publicly available resources created and ...
(Date:4/3/2017)... 2017  Data captured by IsoCode, IsoPlexis ... a statistically significant association between the potency ... and objective response of cancer patients post-treatment. ... whether cancer patients will respond to CAR-T ... as to improve both pre-infusion potency testing and ...
(Date:3/29/2017)... 29, 2017  higi, the health IT company that ... North America , today announced a Series B ... of EveryMove. The new investment and acquisition accelerates higi,s ... to transform population health activities through the collection and ... higi collects and secures data today on behalf ...
Breaking Biology News(10 mins):