Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Coupling a Nano-trumpet With a Quantum Dot Enables Precise Position Determination

14.07.2017

Scientists from the Swiss Nanoscience Institute and the University of Basel have succeeded in coupling an extremely small quantum dot with 1,000 times larger trumpet-shaped nanowire. The movement of the nanowire can be detected with a sensitivity of 100 femtometers via the wavelength of the light emitted by the quantum dot. Conversely, the oscillation of the nanowire can be influenced by excitation of the quantum dot with a laser. Nature Communications published the results.

Professor Richard Warburton and Argovia Professor Martino Poggio’s teams in the Department of Physics and the Swiss Nanoscience Institute at the University of Basel worked with colleagues from Grenoble Alps University and the Alternative Energies and Atomic Energy Commission (CEA) in Grenoble to couple a microscopic mechanical resonator with a nano-scale quantum dot.


Trumpet-shaped nanowires with a length of about 10 micrometers are coupled to quantum dots located at their bases.

Grenoble Alps University

They used nanowires made of gallium arsenide that are about 10 micrometers long and have a diameter of a few micrometers at the top. The wires taper sharply downwards and therefore look like tiny trumpets arranged on the substrate. Near the base, which is only about 200 nanometers wide, the scientists placed a single quantum dot that can emit individual light particles (photons).

Excitations lead to strains

If the nanowire oscillates back and forth due to thermal or electrical excitation, the relatively large mass at the wide end of the nano-trumpet produces large strains in the wire that affect the quantum dot at the base. The quantum dots are squeezed together and pulled apart; as a result, the wavelength and thus the color of the photons emitted by the quantum dot change.

Although the changes are not particularly large, sensitive microscopes with very stable lasers – specifically developed in Basel for such measurements – are capable of precise detection of the wavelength changes. The researchers can use the shifted wavelengths to detect the motion of the wire with a sensitivity of only 100 femtometers. They expect that by exciting the quantum dot with a laser, the oscillation of the nanowire can be increased or decreased as desired.

Potential uses in sensor and information technology

“We are particularly fascinated by the fact that a link between objects of such different sizes is possible,” says Warburton. There are also various potential applications for this mutual coupling. “For example, we can use these coupled nanowires as sensitive sensors to analyze electrical or magnetic fields,” explains Poggio, who is investigating the possible applications with his team.

“It may also be possible to place several quantum dots on the nanowire, to use the motion to link them together and so pass on quantum information,” adds Warburton, whose group focuses on the diverse use of quantum dots in photonics.

Artificial atoms with special properties

Quantum dots are nanocrystals, and are also known as artificial atoms because they behave similarly to atoms. With a typical extent of 10 to 100 nanometers, they are significantly larger than actual atoms. Their size and shape, as well as the number of electrons, can vary. The electrons’ freedom of movement in the quantum dots is significantly restricted; the resulting quantum effects give them very special optical, magnetic and electrical properties. For example, quantum dots are able to emit individual light particles (photons) after excitation, which can then be detected using a tailor-made laser microscope.

Original source
Mathieu Munsch, Andreas V. Kuhlmann, Davide Cadeddu, Jean-Michel
Gérard, Julien Claudon, Martino Poggio, and Richard J. Warburton
Resonant driving of a single photon emitter embedded in a mechanical oscillator
Nature Communications (2017) | DOI: s41467-017-00097-3

Further information
Richard Warburton, University of Basel, Department of Physics, Tel. +41 (0)61 207 35 60, email: richard.warburton@unibas.ch

Weitere Informationen:

https://www.unibas.ch/en/News-Events/News/Uni-Research/Coupling-a-Nano-trumpet-W...

Olivia Poisson | Universität Basel

Further reports about: QUANTUM nanometers nanowire nanowires photons quantum dot wavelength

More articles from Physics and Astronomy:

nachricht A New Home for Optical Solitons
23.01.2019 | Max-Planck-Institut für Quantenoptik

nachricht Collision of individual atoms leads to twofold change of angular momentum
23.01.2019 | Technische Universität Kaiserslautern

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: Bifacial Stem Cells Produce Wood and Bast

Heidelberg researchers study one of the most important growth processes on Earth

So-called bifacial stem cells are responsible for one of the most critical growth processes on Earth – the formation of wood.

Im Focus: Energizing the immune system to eat cancer

Abramson Cancer Center study identifies method of priming macrophages to boost anti-tumor response

Immune cells called macrophages are supposed to serve and protect, but cancer has found ways to put them to sleep. Now researchers at the Abramson Cancer...

Im Focus: Ten-year anniversary of the Neumayer Station III

The scientific and political community alike stress the importance of German Antarctic research

Joint Press Release from the BMBF and AWI

The Antarctic is a frigid continent south of the Antarctic Circle, where researchers are the only inhabitants. Despite the hostile conditions, here the Alfred...

Im Focus: Ultra ultrasound to transform new tech

World first experiments on sensor that may revolutionise everything from medical devices to unmanned vehicles

The new sensor - capable of detecting vibrations of living cells - may revolutionise everything from medical devices to unmanned vehicles.

Im Focus: Flying Optical Cats for Quantum Communication

Dead and alive at the same time? Researchers at the Max Planck Institute of Quantum Optics have implemented Erwin Schrödinger’s paradoxical gedanken experiment employing an entangled atom-light state.

In 1935 Erwin Schrödinger formulated a thought experiment designed to capture the paradoxical nature of quantum physics. The crucial element of this gedanken...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Our digital society in 2040

16.01.2019 | Event News

11th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Aachen, 3-4 April 2019

14.01.2019 | Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

 
Latest News

A New Home for Optical Solitons

23.01.2019 | Physics and Astronomy

Graphene and related materials safety: human health and the environment

23.01.2019 | Materials Sciences

Blood test shows promise for early detection of severe lung-transplant rejection

23.01.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>