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:1/12/2017)... ... January 12, 2017 , ... After her brain cancer ... gave her only a few months to live. Now a paper publishing January ... Rosendahl’s disease and increased both the quantity and quality of her life: Adding ...
(Date:1/12/2017)... and Pune, India , January 12, 2017 ... Market by Type and End Users - Global Opportunity Analysis and Industry Forecast, 2014-2022," ... 2022 from $2,921 million in 2015, growing at a CAGR of 15.07% during the ... ... Allied Market Research Logo ...
(Date:1/11/2017)... ... January 11, 2017 , ... Phase 1 clinical trial ... of the investigational anti-cancer agent tucatinib (formerly ONT-380) against HER2+ breast cancer. The ... percent of these heavily pretreated patients saw clinical benefit from the drug, with ...
(Date:1/11/2017)... ... January 11, 2017 , ... Photonics industry and STEM ... are commending the U.S. Congress and President Obama for their recognition of the ... the American Innovation and Competitiveness Act (AICA). , The language of the act ...
Breaking Biology Technology:
(Date:12/20/2016)... and GENEVA, Dec, 20, 2016   Valencell ... sensor technology, and STMicroelectronics (NYSE: STM), a ... of electronics applications, announced today the launch of ... for biometric wearables that includes ST,s compact ... Valencell,s Benchmark™ biometric sensor system. Together, SensorTile ...
(Date:12/16/2016)... Research and Markets has announced the addition of the "Biometric ... to their offering. ... The biometric vehicle access system market, in terms of value, ... to 2021. The market is estimated to be USD 442.7 Million ... The growth of the biometric vehicle access system market is fueled ...
(Date:12/15/2016)... Calif. , Dec. 15, 2016   WaferGen ... publicly held genomics technology company, announced today that on ... Listing Qualifications Department of The Nasdaq Stock Market LLC ... closing bid price of WaferGen,s common stock had been ... Accordingly, WaferGen has regained compliance with Listing Rule 5550(a)(2) ...
Breaking Biology News(10 mins):