5G Technology World

  • 5G Technology and Engineering
  • FAQs
  • Apps
  • Devices
  • IoT
  • RF
  • Radar
  • Wireless Design
  • Learn
    • 5G Videos
    • Ebooks
    • EE Training Days
    • FAQs
    • Learning Center
    • Tech Toolboxes
    • Webinars/Digital Events
  • Handbooks
    • 2024
    • 2023
    • 2022
    • 2021
  • Resources
    • Design Guide Library
    • EE World Digital Issues
    • Engineering Diversity & Inclusion
    • Engineering Training Days
    • LEAP Awards
  • Advertise
  • Subscribe

‘Game-Changer’ for Photonics: Researchers Demonstrate Record Optical Nonlinearity

By University of Rochester | April 29, 2016

Work by an internationally renowned University of Rochester professor may offer an alternative to the way in which researchers have approached some photonics applications.

Photonics applications rely greatly on what physicists call nonlinear optics – the different way in which materials behave depending on the intensity of light that passes through them. The greater the nonlinearity, the more promising the material for real-life applications. Now a team, led by Robert W. Boyd, Professor of Optics and Physics at the University of Rochester and the Canada Excellence Research Chair in Quantum Nonlinear Optics at the University of Ottawa, has demonstrated that the transparent, electrical conductor indium tin oxide can result in up to 100 times greater nonlinearity than other known materials.

“This result is a game-changer for photonics applications,” said Boyd. “It rests on the core of what I’ve worked on for over 30 years at Rochester. I find it very rewarding that even after all this time there are still fundamental questions to be answered in the field of nonlinear optics.”

The result will be published online by the journal Science on Thursday, April 28, 2016.

Photonics uses light to transmit information. Photonics also uses light to perform logical operations, just as electronics does with electrons. A key aspect to being able to exert control over light is to be able to control a specific property – the refractive index – of the material that is transmitting the light.

Tweaking the refractive index of a material, which leads to light travelling faster or slower, is the key way in which photonics applications control light. When the refractive index is different for different light intensities, the material is described as being optically nonlinear.

When a pulse of light is sent through the material, the refractive index changes according to that intensity. The refractive index of the material is changed for only a few femtoseconds – a few millionths of a billionth of a second. For some potential applications, it is possible to send a second pulse through the material before it has time to recover for the first pulse. This second pulse then “sees” the material as having the refractive index as modified by the first pulse.

In general though, it is the quickness with which the material recovers as well as the range of values that the refractive index can take – how strongly nonlinear the material is – that makes this system particularly attractive to photonics applications.

Boyd, his PhD student at Ottawa, M. Zahirul Alam, and then research associate Israel De Leon (currently a professor in Monterrey, Mexico) were able to improve on the previous record for optical nonlinearities by a factor of 100. This improvement took place because these researchers exploited the unusual optical properties of a material that occurs under certain conditions, what is known as the epsilon-near-zero region.

“It was surprising that showing such a strong optical nonlinearity in a known metal was this easy,” said Boyd. “This material has been around for many years, but until now the community had overlooked the potential that the ‘epsilon-near-zero’ region of materials offered.”

“The optical nonlinear response that we have observed introduces a new paradigm in nonlinear optics,” said De Leon, now a professor at Tecnologico de Monterrey, Mexico. “The common knowledge had always been that nonlinear effects are tiny compared with the linear ones; but in our work we have measured a nonlinear response that is 170% larger than the linear response.”

The result opens the door for more careful study of this region of materials, with a view to finding a material that can offer just the right properties for certain photonics applications.

The ‘epsilon-near-zero’ region for this material is linked to light of a specific frequency, roughly a wavelength of 1.2 micrometers. This wavelength is of interest because it is in between that of visible light and light of wavelength 1.5 micrometers. This wavelength is of particular interest to optical communications, which uses devices such as fiber optics to transmit information in light.

It is possible that changes in the chemical composition of the material could lead to a change in the frequency at which epsilon near zero occurs, thus bringing this frequency closer to that used by optical communications.


Filed Under: RF

 

Next Article

← Previous Article
Next Article →

Related Articles Read More >

Open RAN test service adds colocation capabilities
Switch operates DC to 20 GHz with 128 configurable connection states for asymmetric SerDes testing
Butler Matrix
Butler Matrix drives Wi-Fi and other phased-array antennas
Long-wire dipole antennas: still viable after more than a century

Featured Contributions

  • Overcome Open RAN test and certification challenges
  • Wireless engineers need AI to build networks
  • Why AI chips need PCIe 7.0 IP interconnects
  • circuit board timing How timing and synchronization improve 5G spectrum efficiency
  • Wi-Fi 7 and 5G for FWA need testing
More Featured Contributions

EE TECH TOOLBOX

“ee
Tech Toolbox: 5G Technology
This Tech Toolbox covers the basics of 5G technology plus a story about how engineers designed and built a prototype DSL router mostly from old cellphone parts. Download this first 5G/wired/wireless communications Tech Toolbox to learn more!

EE LEARNING CENTER

EE Learning Center
“5g
EXPAND YOUR KNOWLEDGE AND STAY CONNECTED
Get the latest info on technologies, tools and strategies for EE professionals.

Engineering Training Days

engineering
“bills
5G Technology World
  • Enews Signup
  • EE World Online
  • DesignFast
  • EDABoard Forums
  • Electro-Tech-Online Forums
  • Microcontroller Tips
  • Analogic Tips
  • Connector Tips
  • Engineer’s Garage
  • EV Engineering
  • Power Electronic Tips
  • Sensor Tips
  • Test and Measurement Tips
  • About Us
  • Contact Us
  • Advertise

Copyright © 2025 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy

Search 5G Technology World