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Department of Physics and Astronomy

Postdoc Opportunities

June 2016

We have an exciting new postdoctoral research position in our group on nonlinear optoacoustics and Brillouin scattering in nanoscale waveguides.

An 18 month fixed-term position is available in the Department of Physics and Astronomy at Sydney’s Macquarie University for an exceptional early career researcher in theoretical nonlinear optics, opto-mechanics or integrated quantum photonics. This position is funded by the Australian Research Council Discovery Project “Better vibrations: mixing light and sound in semiconductor chips” which seeks to make major advances in the foundations and applications of nanoscale guided wave opto-acoustics, and particularly Stimulated Brillouin Scattering (SBS). This project is part of a long-term collaboration between Professor Michael Steel at Macquarie, A/Prof. Christopher Poulton at the University of Technology, Sydney (UTS), and Laureate Professor Benjamin Eggleton of the University of Sydney.

About the role

The applicant will perform theoretical physics research on the nonlinear interaction between acoustic and optical waves in photonic waveguides and nanostructures with a focus on enabling efficient opto-acoustic interactions in nanoscale semiconductor waveguides. Questions to be explored include the development of the fundamental dynamical equations for waveguide Brillouin scattering that include all relevant semiconductor physics; finding new approaches to the challenge of joint confinement of light and sound in semiconductor devices; exploiting non-uniform anisotropy and nonlinearity to relax the requirements for efficient Brillouin scattering; and extending the theory of guided wave Brillouin scattering into the quantum regime. This theoretical role will involve close collaboration with experimental researchers and students at Macquarie, UTS and the University of Sydney. The successful candidate will also be a member of the world-renowned Centre of Excellence for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), the largest optics research program in Australia.

Apply

Click here for details on the position and to apply.

Applications close July 31 2016.

Research Student Opportunities

The CUDOS team at Macquarie University is always looking for strong students in optics, physics and optical engineering. We have projects available in theoretical nonlinear optics and quantum optics, experimental quantum optics, femtosecond laser direct writing, and plasmonics, or projects that address several of these at once.

Full scholarships are available for suitably qualified candidates. See the information on the Contact page for details on how to obtain further information.

Why do a PhD or Masters of Research within CUDOS at Macquarie?

  • Full membership of CUDOS, Australia's premier research body in photonics and integrated optics.
  • Support for travel to offsite annual workshop, topical workshops and international meetings.
  • Generous individual research support budget for equipment and travel.
  • Living expenses and fees included in scholarship award.
  • Access to a huge suite of highly advanced fabrication and characterisation labs.
  • Live in vibrant Sydney while working on the beautiful Macquarie University campus.

Scholarship support

PhD scholarships for domestic and international students include nearly $25,000/year for living expenses and all program fees for the duration of the project. Certain projects have an allocated scholarship, others can attract a domestic or international scholarship. Application instructions are available here (international students also see this page), but first please contact us within CUDOS. Certain scholarships are only awarded once a year, but you can contact us at any time. Note that evidence of a high standard of spoken and written English is a condition of acceptance.

Macquarie University also runs cotutelle and joint-PhD programs, which allows PhD students to be affiliated with Macquarie and another university overseas.

PhD and Masters programs in Nonlinear Quantum Integrated Photonics

While the discipline of quantum optics is 50 years old, the past 5 years has seen a revolution as quantum experiments involving photons have moved from bulk optics with lenses and mirrors into integrated photonic circuits. Chip-based technologies allow us to incorporate dozens of optical components into solid state devices of just a few square centimetres. This transition is key to harnessing photons for applications in quantum information including secure communication, ultra precise metrology, quantum computing and fundamental tests of quantum mechanics.

Our research addresses these challenges at the interface of nonlinear photonics and quantum optics. Our theory program studies the basic physics and design of on-chip sources for making non-classical states of light through nonlinear processes involving random fluctuations of the quantum vacuum, as well as complex circuits for multiphoton quantum walks and other quantum processing. In the laboratory, we are using waveguide writing by high power femtosecond lasers to develop both photon light sources and three-dimensional circuits that are completely contained in single chips of glass. We have research student opportunities for mathematically-inclined theorists, highly practical experimentalists and people anywhere in between.

We are currently seeking several talented and motivated PhD candidates to conduct theoretical and experimental work in the areas of integrated and nonlinear quantum photonics. These exciting new disciplines aim to bring the ideas of quantum optics, quantun information and entanglement to the powerful platforms of integrated optics. In this way we hope to achieve extraordinary new limits in measurement, communication, computation and simulation of other quantum systems.

In recent years our quantum program, coordinated by Professor Mike Steel and Professor Michael Withford in the Department of Physics and Astronomy at Macquarie University, has achieved a number of significant milestones in this field, including the first quantum photonic circuit created by femtosecond laser writing, the first 3D integrated quantum photonic circuits, and the first multiplexed photon pair source in a quadratic nonlinear material. On the theoretical side we are developing powerful new mathematical descriptions of the generation and processing of few photon states of light.

We have projects available in both theoretical and experimental work. Projects combining theory and experiment are also possible and encouraged.

Experimental projects

We wish to develop new single photon sources in very highly nonlinear glasses and to create exotic entangled photonic states in integrated waveguides. Such sources are vital to enable the next generation of experiments in optical quantum computation and quantum simulation. This project will involve the use of highly sophisticated femtosecond laser writing systems and quantum characterisation equipment including a large array of single photon detectors.

Students interested in these projects should have some experience in experimental optics and photonics and ideally some knowledge of quantum optics or quantum mechanics.

Theoretical projects

Measured biphoton wavefunction

Theoretical and experimental two-photon wavefunction from a silicon photonic crystal.

This project aims to describe and exploit photon generation driven by non-classical light sources, and nonlinear quantum optics at the very few photon level. The student will explore the generation, manipulation and detection of unusual states of light as enabled by integrated waveguides and optical resonators. There are also connections to the areas of quantum walks and simulation. We also have opportunities to examine the control of entanglement and distinguishability of quantum photonic states through nonlinear optical effects. This work will be performed using the powerful theoretical tools of nonlinear quantum optics and field theory and the student will interact closely with experimental teams at Macquarie and elsewhere in CUDOS.

These projects require high level of skill in analytic and numerical mathematics and preferably some experience in modern formulations of quantum optics or quantum mechanics.

Facilities

Our facilities include start-of-the-art labs incorporating three high-power femtosecond laser systems, advanced quantum light sources and single photon detection systems, nanometric 3-D positioning systems, state of the art micro-optical characterisation facilities, and access to the leading supercomputer sites in Australia. You will be an active participant in CUDOS, a world-renowned partnership of seven universities that is the premier photonics research program in Australia and provides substantial opportunities for international research collaboration, networking and future employment in academia and industry. The entire program in photonics and quantum science Macquarie University is located on a large green campus in the northern suburbs of Sydney, one of the world's most beautiful and exciting cities.

For further information on the above and other projects please contact Professor Mike Steel (michael dot steel at @mq dot edu dot au) and visit the research pages on this site as well as the main CUDOS site.

Recent news

July 28, 2016

New postdoctoral research position in our group on nonlinear optoacoustics and Brillouin scattering in nanoscale waveguides

Are you an expert in nonlinear optics or phononic/photonic devices? We have a new postdoctoral research fellowship available to work on the theory of the fascinating topic of nonlinear light-sound interactions in nanoscale waveguides, especially semiconductor waveguides. Click here for details on the position and to apply. Applications close July 31 2016.  

September 07, 2015

New arxiv manuscript on a quantum treatment of stimulated Brillouin scattering in nanoscale waveguides

Here's a new piece of work that straddles both areas of current interest in the group: quantum nonlinear optics and opto-acoustics. In a new arxiv paper with long time collaborator John Sipe at the University of Toronto, we take another look at the derivation of equations of motion for the opto-acoustic interaction behind stimulated Brillouin scattering in waveguides. We attack the problem with the techniques of guided wave nonlinear quantum optics. By identifying the right Hamiltonian for the opto-acoustic coupling, the coupled mode equations fall out in a very neat fashion. This also opens the way for thinking about Brillouin interactions at the quantum-classical boundary.  

September 5, 2015

New paper on the implications of acoustic dissipation for stimulated Brillouin scattering in waveguides

One of the things that makes the coupling between light and sound in waveguides complicated is the strong dissipation that phonons suffer. Most last only a few nanoseconds. In a new Scientific Reports paper (lead author Christian Wolff at UTS) we look at how the existence of phonon loss means the amplification of light by stimulate Brillouin scattering can be reduced considerably by the phonon lifetime. It's not a deal-breaker, but one needs to be aware of the issue.  

July 24, 2015

New review paper on rigorous derivation of the coupled mode equations for nonlinear optoacoustics

We have a new (very long) paper out in Physical Review A (lead author Christian Wolff at UTS) that provides a rigorous derivation of the equations of motion for stimulated Brillouin scattering (SBS) in nanoscale waveguides. SBS is the nonlinear interaction between light and high frequency phonons (sound waves) and has tremendous promise as a basis for ultracompact devices for microwave photonics, sensing and narrow linewdith chip-based lasers.  

July 23, 2015

New review paper on femtosecond laser written waveguides and quantum optics

Our new review paper on femtosecond laser written waveguides for quantum optics applications (lead authors Thomas Meany and Markus Gräfe) is out in Laser and Photonics Reviews. This paper is a collaboration with the group of Alexander Szameit (Instite of Applied Optics, Jena, Germany) and provides a detailed survey of the use of laser written circuits for many quantum applications, especially those exploting 3D capabilities.  

April 2, 2015

New paper on efficient characterisation of photon sources with loss

Our new paper on useful connections between quantum and classical nonlinear optical processes in waveguides and how scattering loss can affect these connections has appeared in Optics Letters (lead author Luke Helt).  

January 12, 2015

New paper on symmetry properties of nonlinear opto-acoustic interactions

Symmetry groups of acoustic waveguide modes We have a new paper at Optics Express (lead author Christian Wolff at UTS) detailing how symmetry principles can help to accelerate the computation and design problems of nonlinear opto-acoustics (a phenomenon known as Stimulated Brillouin Scattering).  

November 11, 2014

New paper on Faraday rotation in laser written waveguides

Measured Faraday rotation in a laser written waveguide Our new paper (lead author Qiang (Jocelyn) Liu) on Faraday rotation in femtosecond laser written waveguides is out in Optics Express. Jocelyn's work explores the challenges in developing optical isolators in glass waveguides. She also achieved some of the nicest theory-experiment agreement you're likely to see in an optics experiment!  

October 2, 2014

Former student Dr Thomas Meany wins Maquarie's Research Award!

We are very pleased that our former student Dr Thomas Meany (now at Toshiba Labs, UK) has won the Macquarie University Research Award for Excellence in Higher Degree Research. Congratulations Tom. Perhaps this could be you in a few years if you undertake a PhD with us?!  

September 19, 2014

New arXiv manuscript on 3D tunable quantum circuits

Experimental setup for tunable 3D quantum interference Our new manuscript (lead author PhD student Zachary Chaboyer) on demonstrating tunable quantum interference in a 3D 3-arm Mach-Zehnder interferometer is up on the arXiv. We show that our laser written structure should be able to significantly improve phase estimation sensitivity in the quantum regime.  

September 1, 2014

Congratulations to Qiang Liu on being awarded her PhD

Our PhD student Qiang (Jocelyn) Liu has received her PhD for her thesis work on laser-written waveguides in magneto-optical glasses. Jocelyn's work brings us closer to a dedicated optical isolator for the laser written waveguide platform. Well done!  

July 18, 2014

New arXiv manuscript on lossy biphotons

Lasers Our new manuscript (lead author Luke Helt) on the effect of loss on heralded pair generation by spontaneous parametric down-conversion is up on the arXiv. This work investigates how the loss modifies the generated biphoton state, sometimes for good!  

July 16, 2014

New arXiv manuscript on SBS in nanoscale waveguides

Lasers Our new theory of Stimulated Brillouin Scattering (SBS) in nanoscale waveguides (lead author Christian Wollf at UTS) is up on the arXiv. Christian has found some really neat ways of teasing out the different forces involved in modern SBS systems.  

May 2, 2014

PhD student Tom Meany graduates to Toshiba

We are delighted that our former PhD student Thomas Meany has taken up an exciting postdoc position at Toshiba'sCambridge Labs in the UK. Tom will be continuing his work in the area of integrated quantum photonics in new directions involving solid state single photon sources.  

May 1, 2014

New theory of effective photons

Our work on a theory of effective photons in dissipative structured materials (lead author Dr Alex Judge of Sydney University) has just appeared in the New Journal of Physics.  

April 5, 2014

Media coverage of our hybrid single photon source

Lasers The paper on our hybrid single photon source in Laser and Photonics Reviews has attracted a bit of media attention. Amongst others, we've been picked up by Scatterings in Optics and Photonics News and The Register, UK. Here's the original press release.  

April 2, 2014

Commentary in Nature Photonics

Lasers I've written a commentary on recent work at Caltech that showed non-classical plasmon statistics.  

April 2, 2014

Three and four-way multiplexing in a hybrid integrated device.

Lasers In a major collaboration between Macquarie, the University of Sydney and Université Nice Sophia Antipolis (lead authors, we've shown active multiplexing of three and four single photon channels in a hybrid glass/lithium niobate device. We hope this is the future of single photon sources!