3 April 2017:
A new publication from CNBP researchers (lead author Dr Ivan Maksymov pictured) demonstrates a new scheme for synthesis of optical spectra from nonlinear ultrasound harmonics using a hybrid liquid-state and nanoplasmonic device compatible with fibre-optic technology.
The work has just been reported in the journal ‘Optics Express’ and is accessible online.
Journal: Optics Express.
Title: Synthesis of discrete phase-coherent optical spectra from nonlinear ultrasound.
Authors: Ivan S. Maksymov and Andrew D. Greentree.
Abstract: Nonlinear acoustic interactions in liquids are effectively stronger than nonlinear optical interactions in solids. Thus, harnessing these interactions will offer new possibilities in the design of ultra-compact nonlinear photonic devices. We theoretically demonstrate a new scheme for synthesis of optical spectra from nonlinear ultrasound harmonics using a hybrid liquid-state and nanoplasmonic device compatible with fibre-optic technology. The synthesised spectra consist of a set of equally spaced optical Brillouin light scattering modes having a well-defined phase relationship between each other. We suggest that these spectra may be employed as optical frequency combs whose spectral composition may be tuned by controlling the nonlinear acoustic interactions.
13 March 2017:
CNBP scientists Dr Ivan Maksymov and Prof Andy Greentree at RMIT University have shown bubbles can detect sound with light in their latest publication in the area of photo-acoustics.
“Bubbles can be a boon for detecting the kind of ultrasound used in medicine as air is less dense than water” explains Dr Ivan Maksymov, “so ultrasound can squeeze a bubble more than the water surrounding it”.
To detect the change in size, Ivan showed that the bubbles could change the amount of light that passed through a gold membrane with nanosized holes in it. “It’s incredible work, I’m really excited by how Ivan has brought together these different kinds of Physics to create something quite new”, said the study’s co-author Prof Andy Greentree.
To detect the effects of sound on the bubble, on light, Ivan had to develop new computational models. The team say that their work may be useful in the development of an optical hydrophone for detecting ultrasound inside the body. “It will give us a new and potentially more sensitive way to ‘see’ with sound” says Ivan.
The work was published in the journal Physical Review A on 13th March 2017 and was funded by the Australian Research Council Centre of Excellence for Nanoscale BioPhotonics.
5 December 2016:
A new publication from CNBP researchers (lead author Philipp Reineck pictured) demonstrates bright and photostable fluorescence from nitrogen-vacancy centers in unprocessed nanodiamond particle aggregates. The work has just been reported in the journal ‘Nanoscale’ and is accessible online.
Title: Bright and photostable nitrogen-vacancy fluorescence from unprocessed detonation nanodiamond.
Authors: P. Reineck, M. Capelli, D. W. M. Lau, J. Jeske, M. R. Field, T. Ohshim, A. D. Greentree and B. C. Gibson.
Abstract: Bright and photostable fluorescence from nitrogen-vacancy (NV) centers is demonstrated in unprocessed detonation nanodiamond particle aggregates. The optical properties of these particles is analyzed using confocal fluorescence microscopy and spectroscopy, time resolved fluorescence decay measurements, and optically detected magnetic resonance experiments. Two particle populations with distinct optical properties are identified and compared to high-pressure high-temperature (HPHT) fluorescent
nanodiamonds. We find that the brightness of one detonation nanodiamond particle population is on the same order as that of highly processed fluorescent 100 nm HPHT nanodiamonds. Our results may open the path to a simple and up-scalable route for
the production of fluorescent NV nanodiamonds for use in bioimaging applications.
26 August 2016:
Olympus LIVE hosted a workshop today, involving a group of Quantum Physics researchers and students from RMIT University and the ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP).
It was the first microscopy workshop of its kind involving Olympus, the University and Centre, giving students valuable exposure and hands-on experience with resident Olympus microscopy experts.
The initial planning for the event was coordinated by CNBP Chief Investigator Prof Andrew Greentree from RMIT University (pictured top left) and CNBP industry partner Mr Jian Shen from Olympus Australia. The day consisted of a training/education session that was part of the ‘Masters in Nanotechnology and Smart Materials’ course, which is in its first year at RMIT University.
The event was hosted by Olympus at their state of the art new facility at Notting Hill, Melbourne and included a theory session, hands on training on microscopes run by Olympus experts, and a tour of some of the facilities.
It is planned that this will become an annual event as part of the ‘Masters in Nanotechnology and Smart Materials’ course at RMIT.
Said Prof Greentree, “This is just another way that the Olympus/CNBP partnership is providing benefits above and beyond that of direct research.”
19 August 2016:
CNBP Chief Investigator Andrew Greentree presented to a full-house at RMIT University during his Inaugural Professorial Lecture on Friday evening, August 19th, 2016.
Over 150 colleagues, friends, family and members of the public were in attendance to hear about Andy’s innovative research, and to better understand the exciting potential of quantum technology and its many applications.
The inspiring 60 minute talk included live light-based demonstrations and a Q&A session with the audience giving Andy a heartfelt ovation as proceedings concluded. Informal feedback from guests as they departed was that the talk had been inspiring, educational and thoroughly enjoyable in nature!
Below – images from the event.
13 November 2015:
CNBP researchers Andy Greentree, Denitza Denkova and Lindsay Parker took their science to the students on Friday Nov 13th, visiting Belmont High School for a fun filled day of outreach, incorporating science demonstrations, talks, informal discussion and chat.
First up was a 75 minute stage show in front of approximately 80 students from Years 8 and Year 9. Light as a concept was first explained, its wave and particle nature providing the basis for the session. A leaf-blower, table tennis balls, lasers, strobe lights and running water were also used, demonstrating the nature of light and its reflective, refractive and diffractive properties.
Nanodiamonds, iPhones, invisibility cloaks and glow sticks also made an appearance with the challenges and opportunities of looking deeply into the body and CNBP’s research mission clearly outlined.
This was followed by morning tea with the teaching staff and then a further talk and Q&A session with the school’s Year 12 chemistry class.
Thank you to all the students and teachers involved on the day. Great fun and extremely rewarding!
30 September 2015:
In support of the official opening of CNBP’s RMIT University research node, a public lecture was undertaken by CNBP Chief Investigator and RMIT Professor, Andrew Greentree on Wednesday September 30th.
The lecture, titled ‘Seeing into the body, one photon at a time’, saw Andrew Greentree discussing the nature of light, quantum physics, and how new understandings are leading to new biological insights. Also explained was the nano biophotonic research that CNBP is currently undertaking, based on this innovative inter-disciplinary research.
With practical demonstrations (including the use of lasers, table tennis balls and an extra long Slinky) interspersing the 60 minute talk, over 200 members of the public attended and experienced first hand, the passion that Andy brings to his work. Feedback from the event was universally positive.
24 September 2015:
CNBP CI Andrew Greentree was interviewed for the ‘Lost in Science’ radio show on station 3CR in Melbourne.
He was interviewed by Claire Farrugia and discussed Centre activities and his upcoming public lecture, ‘Seeing into the body, one photon at a time’.
The interview aired on Thursday 24th September, but is also available via podcast.
You can click through to the 18:49 minute mark (when Andy’s interview begins) or listen to the entire 30 minute show.
21 September 2015:
Andrew Greentree, CNBP Chief Investigator is a contributing author on a new paper.
Title: Dark state adiabatic passage with branched networks and high-spin systems: spin separation and entanglement
Authors: Caitlin Batey, Jan Jeske and Andrew D. Greentree
Abstract: Adiabatic methods are potentially important for quantum information protocols because of their robustness against many sources of technical and fundamental noise. They are particularly useful for quantum transport, and in some cases elementary quantum gates. Here, we explore the extension of a particular protocol, dark state adiabatic passage, where a spin state is transported across a branched network of initialized spins, comprising one “input” spin, and multiple leaf spins. We find that maximal entanglement is generated in systems of spin-half particles, or where the system is limited to one excitation.
25 August 2015:
CNBP researchers Ivan Maksymov and Andy Greentree gave an invited talk on photo-acoustics at at the Nonlinear Physics Centre of the Australian National University on August 25th, 2015.
Invited by Prof. Yuri Kivshar, the topic of the talk was the plasmon-enhanced photoacoustic and its application in intravascular photoacoustic imaging.
The talk was very well accepted with many questions and follow-up discussions.