Optomechanical crystals to enable chaos-based secure data communications

April 19, 2017, Autonomous University of Barcelona

Researchers from ICN2's Phononic and Photonic Nanostructures (P2N) Group at the UAB campus have published a study in which the complex dynamics, including chaos, of optical nonlinearities, are controlled by using optomechanical crystals and changing the parameters of the excitation laser. This discovery might allow the codification of information by introducing chaos into the signal.

Optomechanical crystals are designed at nanoscale to allow the confinement of photons and mechanical motion in a common physical volume. Such structures are being studied in complex experimental setups and might have an impact in the future of telecommunications. The interaction of the photons and the mechanical motion is mediated by optical forces leading to a strongly modulated beam of continuous-wave light after interacting with an optomechanical crystal. In optomechanics, are usually regarded as detrimental and efforts are made to minimise their effects. ICN2 researchers suggest using them to transport codified information. Initiatives such as PHENOMEN, a European project led by ICN2, lay the foundations of a new information technology combining photonics, radio-frequency (RF) signal processing and phononics.

Researchers from the Phononic and Photonic Nanostructures (P2N) Group, led by the ICREA Research Prof. Dr Clivia Sotomayor-Torres at the Institut Català de Nanociència i Nanotecnologia (ICN2), published an article in Nature Communications presenting the complex non-linear dynamics observed in a silicon optomechanical crystal. Dr Daniel Navarro-Urrios is the first author of this study describing how a continuous-wave, low-power laser source is altered after traveling through one of these structures combining optical and mechanical properties of light and matter.

The paper reports on the nonlinear dynamics of an optomechanical cavity system. The stable intensity of a laser beam was affected by factors such as thermo-optic effects, free-carrier dispersion and optomechanical coupling. The number of photons stored in the cavity affects and is affected by these factors, creating a chaotic effect that researchers were able to modulate by smoothly changing the parameters of the excitation laser. The authors demonstrate accurate control to activate a heterogeneous variety of stable dynamical solutions.

The results of this work set the foundations of a low-cost technology reaching high security levels in optical communications using chaos-based optomechanical cryptographic systems. It is possible to introduce dynamical changes in the light beam traveling through an optical fiber by using an optomechanical crystal. The original light conditions could be reestablished if the parameters of the excitation laser and the optomechanical crystal that introduced those dynamical changes are known. Thus, by linking via optical fibers two integrated chips containing equivalent optomechanical cavities, it is possible to secure information by introducing chaos into the light beam at the emitting point and suppressing it at the reception point.

Explore further: An optomechanical crystal to study interactions among colocalized photons and phonons

More information: Daniel Navarro-Urrios et al. Nonlinear dynamics and chaos in an optomechanical beam, Nature Communications (2017). DOI: 10.1038/ncomms14965

Related Stories

Device boosts interaction between light and motion

April 10, 2017

Optomechanical devices, which simultaneously confine light waves and mechanical waves to permit interaction between them, can be used to study fundamental questions in physics and to sense motion similarly to electromechanical ...

Recommended for you

Pond dwellers called Euglena swim in polygons to avoid light

September 25, 2018

In any seemingly quiet pond the still waters actually teem with tiny pond dwellers called Euglena gracilis. Unseen to the naked eye, the single-celled organism spirals through the water, pulled along a relatively straight ...

Explainer: The US push to boost 'quantum computing'

September 24, 2018

A race by U.S. tech companies to build a new generation of powerful "quantum computers" could get a $1.3 billion boost from Congress, fueled in part by lawmakers' fear of growing competition from China.

A new way to count qubits

September 24, 2018

Researchers at Syracuse University, working with collaborators at the University of Wisconsin (UW)-Madison, have developed a new technique for measuring the state of quantum bits, or qubits, in a quantum computer.


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.