Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Where light and motion become one

02.12.2014

Physicist Tobias Kippenberg measures and manipulates oscillators that are tiny yet still visible to the naked eye. Their optical and mechanical properties are governed by the laws of quantum physics. In recognition of his innovative work he has been awarded the National Latsis Prize 2014.

The laws of quantum physics apply in general at very small scales, governing the behaviour of elementary particles or atoms. Tobias Kippenberg, professor at the Laboratory of Photonics and Quantum Measurements at the Swiss Federal Institute of Technology Lausanne (École Polytechnique Fédérale de Lausanne, EPFL), is seeking to discover, observe and study these laws in macroscopic “mechanical resonators” that are formed from billions of atoms. The 38-year old physicist’s basic research in cavity quantum optomechanics has earned him the National Latsis Prize 2014.

Following his undergraduate degree at the Technical University of Aachen, which preceded a Master of Science, a PhD and post-doctorate research at Caltech in Pasadena, California, Tobias Kippenberg spent a number of years as an independent researcher at the Max Planck Institute of Quantum Optics in Germany, where he collaborated with physics Nobel laureate, Professor Theodor Hänsch. He joined EPFL in 2008 and was promoted to full professor in 2013.

Tiny structures
His current work focuses on miniature ring-shaped glass oscillators, with spokes like bicycle wheels, that are just 24 microns in diameter, corresponding to less than half the width of a human hair. Light is able to move around the circumference of the ring (as though within the tyre of the bicycle wheel), producing by means of internal reflection what the physicists term “radiation pressure.” The result is a slight mechanical vibration.

The resonators are designed to allow them to store photons (light) and phonons (vibrations) in a micro cavity for a relatively long period of time.

Almost absolute zero
In Tobias Kippenberg’s experiments, the device is first cooled to within half a degree of absolute zero (-273.15 °C). However, even this extreme cold is not sufficient to allow quantum behaviour to be observed, as the thermal excitation in the mechanical oscillator causes what is called “quantum decoherence.” In an article published in Nature in 2012, Kippenberg and his team showed for the first time that by further reducing the temperature of the mechanical oscillator by injecting laser light, they were able to reach the regime of “quantum coherent coupling” between light and a mechanical oscillator. During this process, the interaction between the light and vibrations of the resonator is so strong that its mechanical and optical properties cannot be separated. The exchange of the quantum states between the mechanical oscillator and the light field becomes in this regime faster than their decoherence.

At this point, the oscillator is so cold that it spends more than a third of its time in its quantum state. In this mode, it exhibits min-imum vibration that can only be described by the laws of quantum mechanics (a theory that predicts in particular that an object can never be perfectly immobile, even when its temperature is at absolute zero).

Practical quantum physics
In parallel to his basic research on quantum optomechanics, Tobias Kippenberg also considers the applications of his work. In particular, he has discovered another remarkable property of microresonators: by connecting the light of a laser beam to a microresonator using an optical fibre it is possible to produce a so-called optical frequency comb.

Frequency combs are used in particular in the ultra high-precision calibration of astronomical spectrometers or to improve the accuracy of atomic clocks. The problem with current devices is that they are table-sized, extremely complex and have a very fine teeth spacing. Tobias Kippenberg’s devices, in contrast, are miniaturised, exhibit large comb teeth spacing and are constructed using the same techniques as those used to manufacture electronic chips. His first patent for this technology was registered in 2007, with a second following in 2013. The German researcher now hopes to take the next step towards the commercialisation of his invention, with a start-up company.

The National Latsis Prize, which is worth CHF 100,000, is among the most important scientific honours in Switzerland. The SNSF awards the prize on behalf of the International Latsis Foundation to young researchers up to the age of 40 for exceptional scientific work conducted in Switzerland.
The prize, which will be awarded for the thirty first time this year, will be presented in a ceremony at the town-hall in Berne, at 10.30 to 12.00 hours on 14 January 2015 in Berne. Attendance at the ceremony is open to members of the press and media.

Short biography:
Tobias Kippenberg was born in Berlin in 1976, growing up in Groningen in the Netherlands and Bremen in Germany. He obtained a bachelor’s degree in physics at Aachen. He then went on to complete a master’s in 2000 and a PhD in 2004, and to conduct post-doctorate research at Caltech in Pasadena, California. Following a number of years as an independent researcher at the Max Planck Institute of Quantum Optics in Germany and a Habilitation degree from the LMU Munich, he gained a post at the EPFL where he was made professor in 2013.

An in-depth article on Tobias Kippenberg can be found in the latest edition of the Swiss research magazine “Horizons”, which has just been published: www.snsf.ch/ horizons
You can download photographs of Tobias Kippenberg at: www.snsf.ch > Research in focus > Media > Press releases

The Latsis Foundation prizes
The Latsis Foundation was created in Geneva in 1975, by the Greek Latsis family. The Swiss National Science Foundation awards the National Latsis Prize on behalf of the Foundation. There are also four University Latsis Prizes of CHF 25,000 each. These are awarded by the University of Geneva, the University of St. Gallen, the ETHZ and the EPFL.

Contakt
Prof. Tobias Kippenberg
Laboratoire de Photonique et de Mesure Quantique (LPQM)
EPFL
CH-1015 Lausanne
Tel: +41 21 693 4428
E-Mail: tobias.kippenberg@epfl.ch


Weitere Informationen:

http://www.snf.ch/en/researchinFocus/newsroom/Pages/news-141202-press-release-where-light-and-motion-become-one.aspx

Media - Abteilung Kommunikation | idw - Informationsdienst Wissenschaft

More articles from Awards Funding:

nachricht Muscle Growth in the Computer: International Team Wants to Unravel the Formation of Myofibrils
13.06.2018 | Technische Universität Dresden

nachricht Innovation Award of the United Nations Environment Programme for PhD Student from ZMT
22.03.2018 | Leibniz-Zentrum für Marine Tropenforschung (ZMT)

All articles from Awards Funding >>>

The most recent press releases about innovation >>>

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

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

Im Focus: Photoexcited graphene puzzle solved

A boost for graphene-based light detectors

Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...

Im Focus: Water is not the same as water

Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.

From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Novel method for investigating pore geometry in rocks

18.06.2018 | Earth Sciences

Diamond watch components

18.06.2018 | Process Engineering

New type of photosynthesis discovered

18.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>