Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Spinning lightwaves on a one-way street

20.08.2019

Purdue University researchers document a quantum spin wave for light

Researchers at Purdue University have created a quantum spin wave for light. This can be a carrier of information for future nanotechnologies but with a unique twist: they only flow in one direction.


This is an interface of gyrotropic media.

Credit: Zubin Jacob

The article "Unidirectional Maxwellian spin waves", by Todd Van Mechelen and Zubin Jacob has been published in the open access journal Nanophotonics on degruyter.com.

Information technologies at the nanoscale rely on manipulating particles such as electrons and photons. The electron, which is the carrier of charge (electricity), is a fermion while the photon, which is the long-distance transmitter of information, is a boson.

The most important difference between a fermion and a boson is literally how they "spin". Even though electron spin is widely utilized in commercial nanotechnologies such as magnetic memories, optical spin has only recently become a fundamental degree of freedom in nanophotonics with possible applications in fiber optics, plasmonics, resonators and even quantum metrology.

This explosion of research into optical spin is due to the remarkable features of strongly confined electromagnetic waves. At the nanoscale, spin and direction of motion of light are intrinsically locked to one another.

The researchers used many designs to achieve this behavior, in particular, an interface of mirror symmetric gyrotropic media, illustrated in the accompanying figure. Gyrotropy is a form of material response to light waves that transfer spinning behavior of electrons to photons (shown by circular arrows).

"Our research opens up the possibility of new applications where devices communicate information in one direction but block it completely in the reverse. This is important for the safe functioning of high power devices as well as for reducing interference between transmitted/received electromagnetic signals from cellphone antennas," said Zubin Jacob.

Media Contact

Eric Merkel-Sobotta
ems@degruyter.com
49-302-600-5304

 @DeGruyterOA

https://www.degruyter.com/dg/page/open-access 

Eric Merkel-Sobotta | EurekAlert!
Further information:
https://www.degruyter.com/dg/newsitem/344/spinning-lightwaves-on-a-oneway-street
http://dx.doi.org/10.1515/nanoph-2019-0092

More articles from Physics and Astronomy:

nachricht FAST detects neutral hydrogen emission from extragalactic galaxies for the first time
02.07.2020 | Chinese Academy of Sciences Headquarters

nachricht First exposed planetary core discovered
01.07.2020 | Universität Bern

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electrons in the fast lane

Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.

Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....

Im Focus: The lightest electromagnetic shielding material in the world

Empa researchers have succeeded in applying aerogels to microelectronics: Aerogels based on cellulose nanofibers can effectively shield electromagnetic radiation over a wide frequency range – and they are unrivalled in terms of weight.

Electric motors and electronic devices generate electromagnetic fields that sometimes have to be shielded in order not to affect neighboring electronic...

Im Focus: Gentle wall contact – the right scenario for a fusion power plant

Quasi-continuous power exhaust developed as a wall-friendly method on ASDEX Upgrade

A promising operating mode for the plasma of a future power plant has been developed at the ASDEX Upgrade fusion device at Max Planck Institute for Plasma...

Im Focus: ILA Goes Digital – Automation & Production Technology for Adaptable Aircraft Production

Live event – July 1, 2020 - 11:00 to 11:45 (CET)
"Automation in Aerospace Industry @ Fraunhofer IFAM"

The Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM l Stade is presenting its forward-looking R&D portfolio for the first time at...

Im Focus: AI monitoring of laser welding processes - X-ray vision and eavesdropping ensure quality

With an X-ray experiment at the European Synchrotron ESRF in Grenoble (France), Empa researchers were able to demonstrate how well their real-time acoustic monitoring of laser weld seams works. With almost 90 percent reliability, they detected the formation of unwanted pores that impair the quality of weld seams. Thanks to a special evaluation method based on artificial intelligence (AI), the detection process is completed in just 70 milliseconds.

Laser welding is a process suitable for joining metals and thermoplastics. It has become particularly well established in highly automated production, for...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

International conference QuApps shows status quo of quantum technology

02.07.2020 | Event News

Dresden Nexus Conference 2020: Same Time, Virtual Format, Registration Opened

19.05.2020 | Event News

Aachen Machine Tool Colloquium AWK'21 will take place on June 10 and 11, 2021

07.04.2020 | Event News

 
Latest News

Rising water temperatures could endanger the mating of many fish species

03.07.2020 | Life Sciences

Risk of infection with COVID-19 from singing: First results of aerosol study with the Bavarian Radio Chorus

03.07.2020 | Studies and Analyses

Efficient, Economical and Aesthetic: Researchers Build Electrodes from Leaves

03.07.2020 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>