Optical processing glass integrated with CMOS


CUDOS optical chip

“We integrated a novel non-linear glass into an industrially scalable CMOS compatible platform. We maintained the key advantages of both the silicon and the glass, and made a functional and efficient ultra-compact optical circuit,” said Dr Alvaro Casas Bedoya who leads photonics fabrication at CUDOS (see below).

It will allow multiple functions to be integrated in a single chip with active and passive components, such as broadband microwave detectors and modulators.

To showcase the potential of the process, CUDOS researchers demonstrated novel laser, based on the light-sound interaction (stimulated Brillouin scattering), for the first time in an integrated optical circuit.

“The breakthrough here is this realisation that we can actually interface, we can integrate that glass onto silicon and we can interface from silicon to the glass very efficiently – we can harness the best of both worlds,” said CUDOS director Professor Benjamin Eggleton.

Some possible devices, including those based on stimulated Brillouin scattering, are described here.

Fabrication uses silicon wafers from a Belgian semiconductor foundry, a dedicated facility in ANU’s (see below) Laser Physics Centre for the glass deposition, lithography in the RMIT University School of Engineering and are then characterised and tested in the University of Sydney’s AINST (see below).

The research is published in Optica as ‘Compact Brillouin devices through hybrid integration on silicon

Alphabet soup

CUDOS – The Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS) – Australian Research Council Centre of Excellence, headquartered at the University of Sydney, and a research consortium between six Australian universities throughout New South Wales, the Australian Capital Territory and Victoria.

AINST – is the Australian Institute for Nanoscale Science and Technology, a multidisciplinary institute at the University of Sydney.

ANU – Australian National University

RMIT University – initials came from Royal Melbourne Institute of Technology

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