Search
Menu
Hamamatsu Corp. - Earth Innovations LB 2/24

Microcomb Promises Durability in Biophotonics, Metrological Applications

Facebook X LinkedIn Email
A microcomb developed by researchers from Chalmers University of Technology has the potential to herald significant advances in a variety of technologies, spanning metrology and optical communication. The design is based on two microresonators and is coherent, tunable, and reproducible, and has up to 10× higher net conversion efficiency than current state-of-the-art devices.

Microcombs generate a variety of uniformly distributed colors on a tiny cavity known as a microresonator. They can be used to measure or generate frequencies with extreme precision.
Researchers at Chalmers University of Technology, Sweden, present a microcomb on a chip - based on two microresonators instead of one. It is a coherent, tunable and reproducible device with up to ten times higher net conversion efficiency than the current state of the art. Courtesy of Yen Strandqvist, Chalmers University of Technology.
Researchers at Chalmers University of Technology, Sweden, present a microcomb on a chip based on two microresonators instead of one. It is a coherent, tunable, and reproducible device with up to 10× higher net conversion efficiency than the current state-of-the-art. Courtesy of Yen Strandqvist, Chalmers University of Technology.

“The reason why the results are important is that they represent a unique combination of characteristics in terms of efficiency, low-power operation, and control, that are unprecedented in the field,” said first author Óskar Bjarki Helgason, a Ph.D. student in the Department of Microtechnology and Nanoscience at Chalmers.

The design overcomes several well-documented hurdles in the field, thanks in large part to its use of two optical cavities — microresonators — rather than one. The microresonators interact with one another, similar to how atoms bind together when forming a diatomic molecule — an interaction known as a photonic molecule.

Gentec Electro-Optics Inc   - Measure Your Laser MR

The device is small enough to place on the end of a human hair, and has very wide “teeth” — physical qualities that combine to establish numerous opportunities for researchers and engineers. Power consumption in optical communication, for example, could be drastically reduced, as tens of lasers could be replaced by a single chip-scale microcomb in data center interconnects. The design could also contribute to test and measurement applications in lidar for autonomous driving vehicles, where the microcomb could be implemented to measure distances.

Calibration of spectrographs used in astronomical observatories is another potentiality. Their implementation could enable more effective identification of Earth-like exoplanets. Optical clocks and health-monitoring apps for mobile phones are further possibilities. In smartphones, the chip could be used to analyze the composition of exhaled air and detect diseases at earlier stages.

“For the technology to be practical and find its use outside the lab, we need to co-integrate additional elements with the microresonators, such as lasers, modulators, and control electronics. This is a huge challenge that requires maybe five to 10 years and an investment in engineering research,” said Victor Torres Company, lead on the research project at Chalmers.

The research was published in Nature Photonics (www.doi.org/10.1038/s41566-020-00757-9).

Published: March 2021
Glossary
microcomb
A microcomb, short for microresonator frequency comb, is a novel photonic device that generates a precise series of evenly spaced optical frequencies, akin to the teeth of a comb, across a broad spectrum of wavelengths. It operates based on the phenomenon of Kerr frequency comb generation, which occurs in certain nonlinear optical resonators. Microcombs are typically fabricated from high-quality optical materials, such as silicon nitride or silicon dioxide, and have dimensions on the order of...
lidar
Lidar, short for light detection and ranging, is a remote sensing technology that uses laser light to measure distances and generate precise, three-dimensional information about the shape and characteristics of objects and surfaces. Lidar systems typically consist of a laser scanner, a GPS receiver, and an inertial measurement unit (IMU), all integrated into a single system. Here is how lidar works: Laser emission: A laser emits laser pulses, often in the form of rapid and repetitive laser...
Research & TechnologymicroresonatormicrocombspectroscopyLight SourcesLaserslidarChalmersChalmers UniversityChalmers University of TechnologyEuropeNature PhotonicsEuro News

We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.