A Revolution in Optomechanical Materials Enables Manufacturing of Monolithic Components / Easy Industrial Processing of Robust Polycrystalline Diamonds / Precision Sensors for Oscillation Measurement.
The application of light for information processing opens up a multitude of possibilities. However, to be able to adequately use photons in circuits and sensors, materials need to have particular optical and mechanical properties. Researchers at the Karlsruhe Institute of Technology (KIT) have now for the first time used polycrystalline diamond to manufacture optical circuits and have published their results online in Nature Communications (DOI: 10.1038/ncomms2710).
“Diamond has several properties that allow us to manufacture all components of a ready-to-use optomechanical circuit monolithically, so to speak,” says KIT research group leader Wolfram Pernice. “The elements thus manufactured that is, the resonators, circuits, and the wafer, are attractive because of their high quality.”
Diamond is optically transparent to light waves of a wide range of wavelengths including the visible spectrum between 400 and 750 nm. It is due to this fact that it can be used specifically in optomechanical circuits for applications in sensor technology and fluorescence imaging, or for novel optical biological measuring methods. Whereas the high refractive index of diamond and the absence of absorption allow an efficient photon transport, its high modulus of elasticity makes it a robust material which adapts excellently to rough surfaces and releases heat rapidly.
“In our study, we have made use of the fact that today, nanophotonic components can be manufactured in the same sizes as nanoscale mechanical resonators. When the resonator responds, corresponding optical signals are transferred directly to the circuit.” This novel development has allowed the combining of once separate fields of research and has enabled the realization of highly efficient optomechanical circuits.
Integrated optics works in a similar manner to integrated electrical circuits. Whereas optical circuits transmit information via photons, conventional electronic circuits transfer data via electrons. Integrated optics aims to combine all components required for optical communication in an integrated optical circuit to avoid a detour via electrical signals. In both cases, the respective circuits are applied to slices less than one mm in thickness i.e., to the so-called wafers.
The polycrystalline diamond was manufactured in cooperation with the Fraunhofer Institute for Applied Solid State Physics and the company Diamond Materials in Freiburg, Germany. The prototypes manufactured within the Integrated Quantum Photonics-project at the DFG Center for Functional Nanostructures (CFN) in Karlsruhe open up new ways for entirely optically controlled platforms that are increasingly needed in fundamental research and advanced sensor technologies. These technologies include accelerometers that are integrated in various electronic devices such as airbag sensors or smartphone waterlevels.
The DFG Center of Functional Nanostructures (CFN) devotes its attention to the important area of nanotechnology and functional nanostructures. Its objective is to carry out excellent interdisciplinary and international research in order to produce nanostructures with new technical functions and take the first step from fundamental research to application. At the present time, more than 250 scientists and engineers cooperate in more than 80 subprojects networked through the CFN in Karlsruhe, focusing on the areas of nanophotonics, nanoelectronics, molecular nanostructures, nanobiology, and nanoenergy.
Karlsruhe Institute of Technology (KIT) is a public corporation according to the legislation of the state of Baden-Württemberg. It fulfills the mission of a university and the mission of a national research center of the Helmholtz Association. KIT focuses on a knowledge triangle that links the tasks of research, teaching, and innovation.
For further information, please contact: Tatjana Erkert DFG-Centrum für Funktionelle Nanostrukturen (CFN) Tel.: +49 721 608-43409 Fax: +49 721 608-48496 E-Mail: tatjana erkert∂kit edu