Optical circuits sparkle over diamond structures

17 Apr 2013

German collaboration creates high-speed optical devices based on polycrystalline diamond.

Optical techniques for high speed communications, computing and many types of data processing are increasingly well established. However, to be able to effectively employ photons in circuits and sensors, the transport and management media must have particular optical and mechanical properties.

Now researchers at the Karlsruhe Institute of Technology (KIT) have for the first time used polycrystalline diamond to manufacture optical circuits and have published their results online in Nature Communications (DOI: 10.1038/ncomms2710).

KIT research group leader Wolfram Pernice commented, “Diamond has several properties that allow us to manufacture all components needed for a ready-to-use optomechanical circuit monolithically. The elements manufactured in this way – including the resonators, circuits, and the wafer – are attractive to developers because of their high quality.”

Diamond is optically transparent to lightwaves of a wide range of wavelengths, including the visible spectrum between 400nm and 750nm. It is due to this fact that diamond is particularly useful 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.

Precision manufacturing

So far, the KIT team has manufactured optical circuits using monocrystalline diamond substrates – highly pure crystals with typically no more than one impurity atom to every one billion diamond atoms. Such circuits are bound to be small and their application to optical systems has required sophisticated fabrication methods.

Now, for the first time, the research group headed by Pernice has used polycrystalline diamond for the fabrication of wafer-based optomechanical circuits. Even though its crystal structures are more irregular, polycrystalline diamond is robust enough so can be more easily processed. It is due to these specific properties that polycrystalline diamond can be used on much larger areas than monocrystalline material. Polycrystalline diamond conducts photons almost as efficiently as the monocrystalline substrate and is suitable for industrial use. As a matter of fact, monolithic optomechanical components could not have been manufactured without this new material.

Optomechanics combines integrated optics with mechanical elements, such as with nanomechanical resonators in the case of the optomechanical circuit developed by Pernice and his group. These oscillatory systems react to a certain frequency. When that frequency occurs, the resonator is excited into vibration.

Patrik Rath, lead author of this study, comments, “Nanomechanical resonators are among today’s most sensitive sensors and are used in various precision measurements. It is extremely difficult, however, to address such smallest components through conventional measuring methods.”

“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. While 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.

R&D partnership

The polycrystalline diamond was manufactured in cooperation with the Fraunhofer Institute for Applied Solid State Physics and the company Diamond Materials, both based in Freiburg, Germany. The prototypes, manufactured within the Integrated Quantum Photonics-project at the DFG Center for Functional Nanostructures in Karlsruhe, are said to “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 water levels.

About the Author

Matthew Peach is a contributing editor to optics.org.