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Junior scientists at the University of Rostock invent a funnel for light


Together with their colleagues from the University of Würzburg, physicists from the group of Professor Alexander Szameit at the University of Rostock have devised a “funnel” for photons. Their discovery was recently published in the renowned journal Science and holds great promise for novel ultra-sensitive detectors as well as innovative applications in telecommunications and information processing.

The quantum-optical properties of light and its interaction with matter has fascinated the Rostock professor Alexander Szameit since College.

The schematic illustrates how light get trapped by the funnel.

Universität Rostock / Alexander Szameit

In response to the Covid-19 pandemic, Professor Szameit (top) and his students Sebastian Weidemann (bottom left) and Mark Kremer (bottom right) meet via video conference.

Screenshot: Universität Rostock / Alexander Szameit

When his graduate students Mark Kremer and Sebastian Weidemann listened to the theoretical visions of Professor Ronny Thomale of Würzburg, none of them would have suspected that the crazy-sounding theoretical concepts discussed during a workshop in Greifswald would culminate in a publication in the prestigious journal Science just six months later.

“A typical research project takes two years to produce and publish its results, sometimes much longer,” explains Alexander Szameit, who was born in Halle and has found his new personal and scientific in Rostock.

Mark Kremer studied physics in Jena, where he first met Szameit, and followed him to the Baltic sea coast for his Ph.D. With his rare combination of theoretical process and experimental skill, he found an ideal scientific partner in Sebastian Weidemann from Stralsund.

As a research team, the two young scientists develop ideas, cross-examine them rigorously and follow their inspiration to its ultimate conclusion. In the months following the fateful workshop, they spent more time in the lab than at home, until they finally came up with an elegant solution how to build a funnel for light: Many kilometers of tightly coiled-up optical fibers.

“These fiber loops allow us to send light on a virtually infinite journey, just like in a traffic roundabout where all exits have suddenly been closed,” describes Kremer. “Then, at the desired point in time, we switch on the ‘funnel’”. Weidemann explains:

“Following the roundabout analogy, we open a single exit, and all the cars race towards it with top speed, regardless of where they were heading before.”

According to the physicists, the surprising fact is that the opening of that exit instantaneously reaches all photons circulating around the loop. Regardless of their location, they all converge towards a single location – just like through a giant funnel.

This mechanism will be particularly useful for optical sensors, as Professor Szameit explains. He is not only happy about the success of his young team, but also values the fruitful collaboration with the “ct.qmat” in Würzburg-Dresden Cluster of Excellence.

His scientific achievements were recently honored with the Tomassoni prize in Italy. Shortly after his return, the entire university of Rostock transitioned to working from home to counter the spread of the Covid-19 pandemic. How social distancing can be maintained when returning to their labs is still a challenge the physicists are trying to solve.

Wissenschaftliche Ansprechpartner:

Prof. Dr. Alexander Szameit
Experimental Solid State Optics Group
Institute of Physics
Universität Rostock
Phone: +49 381 498-6790


The publication in the journal “Science” is available under DOI 10.1126/science.aaz8727.

Sissy Gudat | Universität Rostock

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