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

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

Leti Field Trials Demonstrate New Multicarrier Waveform for Rural, Maritime Broadband Radio: Field Trial in Orkney Islands Used New Filtered Multicarrier Waveform at 700MHz Band with Flexible Bandwidth Usage (Fragmented and Continuous Spectrum) December 18th, 2017

Graphene enables high-speed electronics on flexible materials: A flexible terahertz detector has been developed by Chalmers using graphene transistors on plastic substrates. It is the first of its kind, and may open for applications requiring flexible electronics such as wireless October 31st, 2017

Nanotube fiber antennas as capable as copper: Rice University researchers show their flexible fibers work well but weigh much less October 23rd, 2017

Govt.-Legislation/Regulation/Funding/Policy

Researchers use sound waves to advance optical communication January 22nd, 2018

Piecework at the nano assembly line: Electric fields drive nano-motors a 100,000 times faster than previous methods January 22nd, 2018

Thanks for the memory: NIST takes a deep look at memristors January 20th, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

Possible Futures

Researchers use sound waves to advance optical communication January 22nd, 2018

Piecework at the nano assembly line: Electric fields drive nano-motors a 100,000 times faster than previous methods January 22nd, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

Arrowhead Pharmaceuticals Announces Pricing of Underwritten Public Offering of Common Stock January 18th, 2018

Optical computing/Photonic computing

Researchers use sound waves to advance optical communication January 22nd, 2018

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

New oxide and semiconductor combination builds new device potential: Researchers integrated oxide two-dimensional electron gases with gallium arsenide and paved the way toward new opto-electrical devices January 10th, 2018

NRL improves optical efficiency in nanophotonic devices January 4th, 2018

Sensors

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

NRL improves optical efficiency in nanophotonic devices January 4th, 2018

'Quantum material' has shark-like ability to detect small electrical signals December 20th, 2017

Record high photoconductivity for new metal-organic framework material December 15th, 2017

Discoveries

Researchers use sound waves to advance optical communication January 22nd, 2018

Piecework at the nano assembly line: Electric fields drive nano-motors a 100,000 times faster than previous methods January 22nd, 2018

Thanks for the memory: NIST takes a deep look at memristors January 20th, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

Announcements

Researchers use sound waves to advance optical communication January 22nd, 2018

Piecework at the nano assembly line: Electric fields drive nano-motors a 100,000 times faster than previous methods January 22nd, 2018

Thanks for the memory: NIST takes a deep look at memristors January 20th, 2018

Arrowhead Pharmaceuticals Announces Pricing of Underwritten Public Offering of Common Stock January 18th, 2018

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

Researchers use sound waves to advance optical communication January 22nd, 2018

Piecework at the nano assembly line: Electric fields drive nano-motors a 100,000 times faster than previous methods January 22nd, 2018

Thanks for the memory: NIST takes a deep look at memristors January 20th, 2018

Nanowrinkles could save billions in shipping and aquaculture Surfaces inspired by carnivorous plants delay degradation by marine fouling January 17th, 2018

Military

Researchers use sound waves to advance optical communication January 22nd, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

New exotic phenomena seen in photonic crystals: Researchers observe, for the first time, topological effects unique to an “open” system January 12th, 2018

Nanotube fibers in a jiffy: Rice University lab makes short nanotube samples by hand to dramatically cut production time January 11th, 2018

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

New catalyst for hydrogen production is a step toward clean fuel: Carbon-based nanocomposite with embedded metal ions yields impressive performance as catalyst for electrolysis of water to generate hydrogen January 16th, 2018

The nanoscopic structure that locks up our genes January 16th, 2018

Nanotube fibers in a jiffy: Rice University lab makes short nanotube samples by hand to dramatically cut production time January 11th, 2018

Teachers in Space, Inc. wins Dream Project contest January 9th, 2018

Photonics/Optics/Lasers

Researchers use sound waves to advance optical communication January 22nd, 2018

New Method Uses DNA, Nanoparticles and Top-Down Lithography to Make Optically Active Structures: Technique could lead to new classes of materials that can bend light, such as for those used in cloaking devices January 18th, 2018

Leti to Demo New Curving Technology at Photonics West that Improves Performance of Optical Components January 18th, 2018

New exotic phenomena seen in photonic crystals: Researchers observe, for the first time, topological effects unique to an “open” system January 12th, 2018

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project