From 1 May to 23 May, the student chapter launched our new seminar platform “Student chapter forum,” with three sessions.
Dr. Luca Carletti, from Università degli Studi di Brescia in Italy, gave the first lecture of the forum on the first of May. His topic was ” Nonlinear nanophotonics driven by Mie type resonances in all-dielectric nanoresonators”.
On the same day, Ms. Natalia Morais, a PhD visiting student from Paris Diderot University in France, gave the second lecture on “High-contrast AlGaAs nonlinear integrated photonics”.
The second session on the eighth of May featured a lecture by Mr. Davide Rocco, a PhD visiting student from Università degli Studi di Brescia in Italy. His lecture was on the subject of “Linear and nonlinear nanophotonics in AlGaAs nanocylinders”.
The third session, on 23 May, began with a lecture by Mr. Valerio Flavio Gili, a PhD visiting student from Paris Diderot University in France, on the subject of “Nonlinear nanophotonics on AlGaAs-on-AlOx monolithic platform”.
Dr. Niccolo Somaschi from Quandela, France gave the final lecture on “Accelerating optical quantum technologies with quantum-dot based devices”.
The Student Chapter Forum aims at providing a platform for photonics students and early career researchers to scientifically interact. The Forum, under the new title of “Photonics Vitality”, will become an anual event as one of the key activities of our chapter.
On 6&7 March, 2018, the ANU OSA-SPIE student chapter co-organized a scientific workshop entitled “Nanophotonics 2018 – The next Frontier” at ANU. The workshop featured over 30 international and domestic invited speakers who are experts in the field of nanophotonics. Speakers included Prof. Nader Engheta from University of Pennsylvania, USA, Prof. Harald Giessen from Stuttgart University, Germany, and Prof. Shuang Zhang from University of Birmingham, UK.
Our recruitment event for 2018 was on April 27th in the RSPE tea room. We all enjoyed some pizzas, snacks and drinks and socialised with fellow physicists while learning about the SPIE & OSA student chapters.
As a part of the National Youth Science Forum program some bright high school students visited the Research School of Physics and Engineering at ANU on the 5th of January. To encourage them to pursue a bachelors degree in science the SPIE and OSA ANU student chapters organised some lectures on polarisation and diffraction.
Students were eager to apply what they learned in the lecturers, so they took a photo when a diffraction grating was placed in front of the camera too!
On Dec. 14 Prof. Christodoulides and A/Prof. Khajavikhan from CREOL, University of Central Florida, were kind enough to give the SPIE visiting lectures for 2017. This event was organised by the ANU SPIE student chapter.
Prof. Christodoulides gave a highly exciting lecture on two topics: Parity-Time Symmetry in Optics and Photonics and Airy beams.
Prof. Christodoulides giving the first lecture
After a short afternoon tea, A/Prof. Khajavikhan then gave a fascinating lecture on Coherence and Collective Properties of Metallic Nanolasers.
After the lectures we also organized a special social event for the students visiting lecturers.
The SPIE visiting lecturer program is one of the primary benefits of Membership in SPIE, which offers the opportunity to interact with world-class scientists and engineers at the leading edge of technological advances in optics and photonics.
The prospect of judiciously utilizing both optical gain and loss has been recently suggested as a means to control the flow of light. This proposition makes use of some newly developed concepts based on non-Hermiticity and parity-time (PT) symmetry-ideas first conceived within quantum field theories. By harnessing such notions, recent works indicate that novel synthetic structures and devices with counter-intuitive properties can be realized – potentially enabling new possibilities in the field of optics and integrated photonics. Non-Hermitian degeneracies, also known as exceptional points (EPs), have also emerged as a new paradigm for engineering the response of optical systems. In this talk, we provide an overview of recent developments in this newly emerging field. The use of other type symmetries in photonics will be also discussed.
Demetri Christodoulides is a Pegasus and Cobb Family Endowed Chair Professor at CREOL-the College of Optics and Photonics of the University of Central Florida. He received his Ph.D. degree from Johns Hopkins University in 1986 and he subsequently joined Bellcore as a post-doctoral fellow at Murray Hill. Between 1988 and 2002 he was with the faculty of the Department of Electrical Engineering at Lehigh University. His research interests include linear and nonlinear optical beam interactions, synthetic optical materials, optical solitons, and quantum electronics. He has authored and co-authored more than 325 papers. He is a Fellow of the Optical Society of America and the American Physical Society. In 2011 he received the R.W. Wood Prize of OSA.
Coherence and Collective Properties of Metallic Nanolasers
Assistant Professor Mercedeh Khajavikhan
CREOL, University of Central Florida, USA
Nanolasers, a family of light sources with dimensions smaller than the wavelength of light are one of the latest additions to the laser family. The application of such sources ranges from on-chip optical communication to high-resolution and high-throughput imaging, sensing and spectroscopy. This has fueled interest in developing the ‘ultimate’ nanolaser: a scalable, low-threshold source of radiation that operates at room temperature and occupies a small volume on a chip. However, progress towards realizing this ultimate nano-laser has been hindered by the lack of a systematic approach to scaling down the size of the laser cavity without significantly increasing the threshold power required for lasing. In other words, the miniaturization of laser resonators using dielectric or metallic structures, across all previously proposed solutions, faces two challenges; First, the (eigen) mode scalability, implying the existence of a self-sustained electromagnetic field regardless of the cavity size. Second, the disproportionate reduction of optical gain and cavity losses, which results in a large and/or unattainable lasing threshold as the volume of the resonator is reduced. In this talk, I present our results about lasing in the newly introduced nanoscale, sub-wavelength in all three dimensions, coaxial cavities that potentially solve the resonator scalability challenge by the choice of geometry and metal composition. In particular, I present the design, fabrication, characterization, and analysis that resulted in the smallest, room-temperature, continuous wave, telecommunication wavelength laser to date. Furthermore, by utilizing the unique properties of the coaxial cavities, which may have a single non-degenerate mode, I discuss the possibility of thresholdless lasing that provides a scalable solution to overcome the metal losses. I will then explain how to measure the second order coherence function for such light sources in order to verify if they are indeed capable of generating coherent radiation. At the end, I will discuss the possibility of collective behaviors in arrays of nanoscale lasers.
On the 15th September the ANU student chapter of the OSA hosted Prof. Mikhail Belkin, from the University of Texas at Austin, as an OSA travelling lecturer. In his talk on “Photonic devices based on quantum-engineered nonlinear metamaterials” he described how his group uses inter-sub-band transition semiconductor heterostructures to make practical photonic devices.
These devices have functionalities not available with any other technology. For example, he described how they developed terahertz semiconductor laser sources based on efficient intra-cavity nonlinear frequency mixing in quantum cascade lasers. He also discussed their ultrathin highly-nonlinear metasurfaces that can provide broadband focal-plane frequency up- and down-conversion in the near-mid-far-infrared with only mW-level of optical pumping. His talk attracted a broad interest across the school and generated many discussions.