Topical workshop on Nanoplasmonic Integrated Photodetectors - ABSTRACTS

Dr Lu Hua

Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology

Integrated plasmonic detectors: Introduction and review

The development of nano-photonic circuitry has led to the realisation of numerous compact and powerful methods for the manipulation of optical signals. However, many of these methods still require coupling to bulky external detectors for their operation. Plasmonic integrated detectors offer the possibility of alleviating this bottleneck so that fully integrated nano-photonic circuitry can be developed. In this presentation we introduce the key concepts of plasmonic integrated detectors and broadly review current progress in the field.

A/Prof. Kylie Catchpole

College of Engineering and Computer Science, The Australian National University

Scattering, near-field enhancement and charge injection for plasmonic enhancement of solar cells

Light trapping is of fundamental importance in many types of solar cells to allow maximum efficiencies, and hence lowest costs, to be reached. We show that that light trapping can lead to substantial efficiency increases using plasmonic scattering and near-field enhancement and evaluate the potential of plasmonic structures to contribute to charge injection in solar cells.

Prof. Jarek Antoszewski

Microelectronics Research Group (MRG), The University of Western Australia

HgCdTe based IR Photodetectors

The two main R&D goals in the field of the infrared photodetectors are: (i) detectors operating without cooling, and (ii) multi band and hyperspectral detection.
The first goal is related to improvement of signal to noise ratio. The thermal noise in infrared photodetectors is inherently associated with the narrow energy gap of semiconductor materials used for these devices and hence its reduction is critical for operation at higher temperatures. Recently, a new detector design, based on unipolar barrier structure, is getting significant attention, where the Shockley-Rhead-Hall component of dark current/noise has been eliminated. On the other hand the signal to noise ratio can be increased by improving the optical collection efficiency. Several different approaches have been proposed and demonstrated including: microlenses, waveguides, resonant cavities, and surface plasmons techniques.
The second main goal is related to increasing demand “to see colours in infrared”, in other words to be able to perform “on pixel” spectral analysis. The FTIR technique, used in laboratory environment, cannot be transferred easily to “on pixel” solution. Therefore, there is a significant effort to develop such “on pixel” technology using multilayer semiconductor structures for multi band detectors, and optical MEMS based Fabry–Pérot filters for hyperspectral applications.
In the presentation, all above issues will be reviewed and discussed in detail.

Dr Chandra Natarajan

School of Engineering, Electronic and Nanoscale Engineering Division University of Glasgow

Superconducting nanowire single-photon detectors: physics and applications

Single-photon detectors based on superconducting nanowires (SSPDs or SNSPDs) have rapidly emerged as a highly promising photon counting technology for infrared wavelengths. These devices offer high efficiency, low dark counts and excellent timing resolution. In this presentation, I will cover the basic SNSPD operating principle and models of device behavior. I will give an overview of the evolution of SNSPD device design and the improvements in performance that have been achieved, also evaluate device limitations and noise mechanisms. I will discuss about optical coupling schemes for SNSPDs and finally summarize some of the promising application areas, ranging from quantum cryptography to remote sensing.

Dr Manuel Decker

Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University

Integration of functional plasmonic elements with on-chip optical waveguides

Plasmonic nanoantennas and metamaterials have been and still are a fascinating research topic with many potential applications. However only little transfer from fundamental investigations into real-world application has been achieved so far mainly due to the inherent losses introduced by the use of metals in the optical regime. These losses limit the performance of plasmonic devices that ultimately have to compete with highly-efficient solutions that are already existent on the market. Hence plasmonics has to offer new functionalities that can be implemented into existing technology platforms.

Here we demonstrate numerically and experimentally how we can utilize fundamental physical principles like e.g. Fano resonances and dipole interference to design bi-directional plasmonic nanoantennas that can be integrated onto Silicon waveguides and provide two-color light demultiplexers by coupling different wavelengths of light into opposite waveguide directions.

Mr Alireza Maleki

MQ Photonics Research Centre, Macquarie University

Curved gratings for coupling and focusing surface plasmon waves

Surface plasmon waves are bounded electromagnetic waves at the interface of a metal and dielectric. Because of the strong confinement of these surface waves, the geometry of the plasmonic structures such as plasmonic gratings plays an important role in manipulating the surface waves. Here I discuss the effect of the sector angle of concentric curved gratings on the coupling of light into surface plasmon waves. It is shown that by increasing the sector angle of the curved gratings, the size of the lateral distribution of the coupled surface plasmon waves decreases, allowing control of the focal spot size of the resulting surface plasmon waves for in-plane nano-photonic architectures.

Mr Patrik Rath

Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany

Travelling wave superconducting nanowire single photon detectors

Superconducting nanowires allow for realizing single photon detectors with high timing resolution and quantum efficiency. These detectors can be directly integrated into nanophotonic circuits. By fabricating nanowire detectors directly on top of waveguides, in a travelling wave geometry, near perfect detection efficiency, high timing resolution and a miniature footprint are achieved all in the same device. Furthermore it is possible to fabricate them on silicon-on-insulator wafers for the telecom wavelengths, but also on large bandgap semiconductors, enabling fast and efficient on-chip single photon detection of photons in the infrared and visible.

Dr Qiming Zhang

Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology

Graphene plasmonics and photo-detection

Advances in the wafer-scale synthesis of graphene are enabling the development of integrated electronic-photonic circuits with remarkable optical and electronic properties. This talk will explore recent advances in integrated graphene plasmonics and photo-detection.

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