Connecting Theory and Practice in Optoelectronics

NUSOD 2016 Conference breaks paper record

NUSOD-16 delegates

NUSOD 2016 participants

Thanks to all participants and organizers for a very stimulating conference in Sydney which featured a record number of 103 papers, two more than in Rome 2011. Summaries of all presentations are now available online. For the first time, we conducted a poster competition which contributed to two quite vibrant poster sessions. Prizes were awarded to posters MP01, MP31, and TuP32. Our rump session on Thursday evening started some interesting and important discussions which may continue on this blog. The 17th NUSOD conference will take place at the Technical University of Denmark, July 24-28, 2017. I very much hope to see you there!

NUSOD 2016 Preview: Modelling of Single Photon Detection using Superconducting Nanowires Integrated in a Photonic Chip Cavity


Figure 1. Single photons are coupled into the ring resonator on top of which the SNSPD has been deposited. The enhance in the interaction time between the single photon and the nanowire increases the detection efficiency.

In the last couple of decades, photonic quantum computing has become a leading contender as a platform for quantum information processing [1]. Recently, CMOS-fabrication technology has been used for quantum optics applications using compact silicon-on-insulator (SOI) photonic circuits. Integrated photonic components allow us to have more complex, stable and scalable quantum photonics devices.

Single photon detectors (SPD) are one of the fundamental building blocks for quantum information processing and therefore highly efficient and fast SPDs with potential for integration are crucial.  Read more of this post

NUSOD 2016 Preview:Numerical Simulation of Quantum Dot Single Section Fabry-Perot Laser Combs


Calculated output power versus time at the laser facet (red line) and after GDD compensation (blue line). The inset plots the simulated optical spectrum.

There is an increasing interest toward the development of simple and compact comb laser sources. One promising application is the use of a InAs/GaAs Quantum Dot or InAs/InP Quantum Dash single section Fabry-Perot lasers. Many experiments on these devices have demonstrated the possibility of generating a wide optical spectrum of lasing longitudinal modes that are phase-locked. The phase locking is demonstrated by the very narrow RF line at the beat note frequency and by the possibility of getting pulses directly at the laser output or after group delay dispersion compensation with a proper length of dispersive optical fibre. There is however a lack of modelling work providing physical explanations on the capability of the QD lasers of generating phase locked lasing lines.

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NUSOD 2016 Preview: Modeling of light soaking effect in CdTe Solar Cells

light soakNearly all photovoltaic technologies exhibit changes in device performance under extended illumination, or “light soaking”. Experiments on both commercial modules and research cells based on CdTe technology have shown improvement of cell performance under light soaking conditions for up to 20 hours. Many accredited such phenomena to the passivation of traps and migration of Cu ions. In this work, we employed a self-consistent one-dimensional (1D) diffusion-reaction simulator to study the migration and passivation of Cu related dopants in CdTe solar cell as a function of soaking conditions. Read more of this post

NUSOD 2016 Preview: GaAs-based dilute bismide semiconductor lasers – theory vs. experiment

GaBiAs_band_gapsTwo long sought-after goals for the semiconductor community have been (i) to develop long-wavelength semiconductor lasers on GaAs substrates, to enable exploitation of vertical-cavity architectures as well as monolithic integration with GaAs-based high-speed microelectronics, and (ii) to realise uncooled operation of semiconductor lasers, whereby the external cooling equipment typically required to maintain operational stability in long-wavelength devices can be removed in order to significantly reduce energy consumption without degrading the device performance.

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