Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Rice U. study: Vibrating nanoparticles interact: Placing nanodisks in groups can change their vibrational frequencies

Rice University scientists found they could selectively alter resonant frequencies (graph) of gold nanodisks by grouping them with slightly different placement and spacing. (Image courtesy of C. Yi/Rice University)
Rice University scientists found they could selectively alter resonant frequencies (graph) of gold nanodisks by grouping them with slightly different placement and spacing. (Image courtesy of C. Yi/Rice University)

Abstract:
Like a tuning fork struck with a mallet, tiny gold nanodisks can be made to vibrate at resonant frequencies when struck by light. In new research, Rice University researchers showed they can selectively alter those vibrational frequencies by gathering different-sized nanodisks into groups.

Rice U. study: Vibrating nanoparticles interact: Placing nanodisks in groups can change their vibrational frequencies

Houston, TX | Posted on October 16th, 2017

SUMMARY:
Like a tuning fork struck with a mallet, tiny gold nanodisks can be made to vibrate at resonant frequencies when struck by light. In new research this week, Rice University chemist Stephan Link and colleagues showed how to selectively alter those vibrational frequencies by gathering different-sized nanodisks into groups.

a-RiceLogo-72dpi-3in

Rice University
Office of Public Affairs / News & Media Relations

David Ruth
713-348-6327


Jade Boyd
713-348-6778


Rice U. study: Vibrating nanoparticles interact
Placing nanodisks in groups can change their vibrational frequencies

HOUSTON -- (Oct. 16, 2017) -- Like a tuning fork struck with a mallet, tiny gold nanodisks can be made to vibrate at resonant frequencies when struck by light. In new research, Rice University researchers showed they can selectively alter those vibrational frequencies by gathering different-sized nanodisks into groups.

"In the tuning fork analogy, it would be as if we could alter the sounds of several forks by bringing them close together," said Rice nanoscientist Stephan Link, the lead researcher on a study in this week's Proceedings of the National Academy of Sciences. "But at the nanoscale, we do not hear a tonal shift; we instead see a tiny change in color. We've shown that by grouping nanodisks, we can shift their acoustic resonance in an orderly and predictable way, which could be useful in optomechanics."

Optomechanics is a merged branch of physics, materials science and nanophotonics that focuses on the interactions between light and mechanical devices. Optomechanical systems are used in telecommunications, microscopy, quantum computing and sensors, including the laser interferometers that detected the first gravity waves in 2016.

Rice postdoctoral research associate Chongyue Yi and colleagues in Link's lab and the research group of Rice nanophotonics pioneer Naomi Halas created and tested more than a dozen sample groupings of nanodisks using electron beam lithography. Each group of tiny gold disks sat atop a flat surface called a substrate, which was sometimes ordinary glass and sometimes aluminum oxide. Yi, the study's first author, oversaw tests on nanodisks ranging in size from 78 to 178 nanometers in diameter, which were configured in patterns containing two to 12 disks.

Yi used two sets of laser beams to test the resonance of the groups. A pulse laser was used to strike the disks, which added a burst of energy analogous to the mallet striking the tuning fork. The light pulse provided an almost instant burst of heat, which caused the metal disks to expand and contract very fast, several billion times each second. A second laser beam was used to probe these vibrations by detecting tiny changes in their color in a microscope. The color was due to surface plasmons, coherent oscillations of conduction band electrons, which experienced intensity fluctuations with the frequency or speed at which the disks expanded and contracted.

Link and Yi's experiments showed the resonant frequency of smaller disks shifted about 20 percent when they were placed near larger disks. In collaboration with theorists at Rice and the University of Melbourne, the researchers determined that the acoustic vibrations from larger particles were traveling through the substrate to modify the resonances of smaller particles. To test this explanation, Yi conducted further experiments to show he could predictably alter the vibration frequencies of his samples by varying their size and distance as well as the surfaces to which they were attached.

"It really depends on what substrate we are using," Yi said. "With glass, the frequency change is larger than with aluminum oxide. Glass is softer. If the material is more stiff, it is harder to make it vibrate."

Link said the research points to a new way for engineers to convert light energy into mechanical energy and vice versa at the nanoscale.

"This gives us a new knob for precise tuning of the light output from metallic nanostructures," he said. "It opens the door for new applications in secure communications, sensing and more."

Study co-authors include Naomi Halas, Pratiksha Dongare, Man-Nung Su, Wenxiao Wang, Fangfeng Wen, Wei-Shun Chang and Peter Nordlander, all of Rice, and Debadi Chakraborty and John Sader, both of the University of Melbourne.

The research was supported by the Welch Foundation, the Army Research Office, the Air Force Office for Scientific Research, the National Science Foundation and the Australian Research Council.

####

About Rice University
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation’s top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,879 undergraduates and 2,861 graduate students, Rice’s undergraduate student-to-faculty ratio is 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for quality of life and for lots of race/class interaction and No. 2 for happiest students by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger’s Personal Finance. To read “What they’re saying about Rice,” go to http://tinyurl.com/RiceUniversityoverview

Follow Rice News and Media Relations via Twitter @RiceUNews

For more information, please click here

Contacts:
David Ruth
713-348-6327


Jade Boyd
713-348-6778

Copyright © Rice University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

The DOI of the PNAS paper is: 10.1073/pnas.1712418114

Related News Press

Wireless/telecommunications/RF/Antennas/Microwaves

HTA to Present European Strategy for Competitive Micro- and Nanotechnologies & Smart Systems: Special Event in Brussels on April 24 Gathers Research Institutes’ CEOs, European Commissioners and Key European Industrials April 17th, 2018

Doing the nano-shimmy: New device modulates light and amplifies tiny signals April 12th, 2018

High-speed and on-silicon-chip graphene blackbody emitters: Integrated light emitters for optical communications April 5th, 2018

Smaller and faster: The terahertz computer chip is now within reach: Hebrew university researcher shows proof of concept for nanotechnology that will make computers run 100 times faster March 27th, 2018

Govt.-Legislation/Regulation/Funding/Policy

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Quantum shift shows itself in coupled light and matter: Rice University scientists corral, quantify subtle movement in condensed matter system April 16th, 2018

When superconductivity disappears in the core of a quantum tube: By replacing the electrons with ultra-cold atoms, a group of physicists has created a perfectly clean material, unveiling new states of matter at the quantum level April 16th, 2018

Possible Futures

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Optical computing/Photonic computing

High-speed and on-silicon-chip graphene blackbody emitters: Integrated light emitters for optical communications April 5th, 2018

Leti Silicon Photonics Design Kit Available in Synopsis OptoDesigner Suite: Kit Contains Design Rules and Building Blocks for Multi-Project Wafers And Custom Runs on Leti’s Si310 Platform April 5th, 2018

MSU-based physicists witnessed the turning of a dielectric into a conductor March 29th, 2018

Smaller and faster: The terahertz computer chip is now within reach: Hebrew university researcher shows proof of concept for nanotechnology that will make computers run 100 times faster March 27th, 2018

Sensors

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Doing the nano-shimmy: New device modulates light and amplifies tiny signals April 12th, 2018

Scientists Use Nanotechnology to Detect Molecular Biomarker for Osteoarthritis March 13th, 2018

Graphene on toast, anyone? Rice University scientists create patterned graphene onto food, paper, cloth, cardboard February 13th, 2018

Discoveries

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Announcements

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

New qubit now works without breaks: A universal design for superconducting qubits has been created April 19th, 2018

Observing biological nanotransporters: Chemistry April 19th, 2018

Salt boosts creation of 2-D materials: Rice University scientists show how salt lowers reaction temperatures to make novel materials April 18th, 2018

Military

Quantum shift shows itself in coupled light and matter: Rice University scientists corral, quantify subtle movement in condensed matter system April 16th, 2018

New 4-D printer could reshape the world we live in March 20th, 2018

Imaging technique pulls plasmon data together: Rice University scientists' hyperspectral method analyzes many plasmonic nanoparticles in an instant March 16th, 2018

Flat gallium joins roster of new 2-D materials: Rice University, Indian Institute of Science introduce gallenene March 12th, 2018

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

Remote-control shoots laser at nano-gold to turn on cancer-killing immune cells April 20th, 2018

Lifeboat Foundation funds flying 3D-printed classroom cubesats with Perlan II April 16th, 2018

Thermo Scientific Krios G3i Cryo-Electron Microscope Wins Gold Edison Award: Krios G3i helps scientists better understand disease mechanisms in order to accelerate cures April 12th, 2018

Bloodless revolution in diabetes monitoring: Scientists have created a non-invasive, adhesive patch, which promises the measurement of glucose levels through the skin without a finger-prick blood test April 10th, 2018

Photonics/Optics/Lasers

Doing the nano-shimmy: New device modulates light and amplifies tiny signals April 12th, 2018

Phononic SEIRA -- enhancing light-molecule interactions via crystal lattice vibrations April 10th, 2018

High-speed and on-silicon-chip graphene blackbody emitters: Integrated light emitters for optical communications April 5th, 2018

Leti Silicon Photonics Design Kit Available in Synopsis OptoDesigner Suite: Kit Contains Design Rules and Building Blocks for Multi-Project Wafers And Custom Runs on Leti’s Si310 Platform April 5th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project