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Selective excitation of a three-dimensionally oriented single plasmonic dipole

Photonics Research 2019年第6期7卷 693-698页

作者： FAJUN XIAO GUANGLIN WANG XUETAO GAN WUYUN SHANG SHIYIN CAO WEIREN ZHU TING MEI MALIN PREMARATNE JIANLIN ZHAO MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi'an 710129 China Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC 3800 Australia

We experimentally demonstrate a scheme to deterministically excite a three-dimensionally oriented electric dipole in a single Au nanosphere by using a tightly focused radially polarized beam whose focal field possesses polarization states along three-dimensional(3D) orientations owing to the spatial overlap between longitudinal and radial electric field components. Experiment observations indicate that the orientation of an excited dipole moment gradually changes from out-of-plane to in-plane when the nanosphere is moved away from the beam center, which is reconfirmed by full-wave simulations. Moreover, rigorous calculation based on Mie theory reveals that a reduced effective ambient permittivity accompanies the rotation of the dipole moment, leading to a blue-shifted and narrowed resonance peak. We envision that our results could find applications in detecting the 3D orientation of isolated molecules and benefit the fine manipulation of light–matter interactions at the single-molecule level.

关键词： Selective excitation plasmonic dipole

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Cavity quantum electrodynamic analysis of spasing in nanospherical dimers

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Physical Review B 2019年第8期100卷 085439-085439页

作者： Tharindu Warnakula Sarath D. Gunapala Mark I. Stockman Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton Victoria 3800 Australia Jet Propulsion Laboratory California Institute of Technology Pasadena California 91109 USA Department of Physics and Astronomy Georgia State University Atlanta Georgia 30303 USA

We present a detailed cavity quantum electrodynamic model of a nanospherical dimer and use it to analyze bright hybrid spasing modes there. Using an approximate numerical scheme, we model the complete spasing system as an open quantum system under the Lindblad dissipator formalism. We show that while in general the longitudinal dimer setups display higher intensity spasing as compared with transverse dimers, the latter actually consistently lead to output with higher coherence. Intriguingly, and somewhat counterintuitively, we find that transverse dimers only reach peak output at an intermediate dimer separation at which field confinement is not the strongest. We show that this is due to low radiative decay rates of transverse dimers with significant dimer gaps. We also find that transverse dimers outperform longitudinal dimers in terms of output intensity in a weakly pumped sparse gain medium made of dimers with relatively large separations. Moreover, in all the configurations considered, we find that the second-order coherence of the spasing output shows a peaked behavior just before the threshold, suggesting that the coherence is a useful indicator of spasing. Even though the scheme we describe is focused on dimers, owing to the generic form of the analysis presented, it can be easily extended to investigate spasing in the bright modes of multiple coupled plasmon sources.

关键词： Hybrid quantum systems Plasmonics Nanoparticles

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Partially coherent light interaction with nano objects

Partially coherent light interaction with nano objects

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International Conference on Transparent Optical Networks

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering (ECSE) Monash University Clayton VIC Australia

Scattering of fully coherent light from nano objects is a very matured field with plethora of applications. However, due to various fundamental and operational reasons, fluctuations in various characteristic features of interacting light fields cannot be fully suppressed. Such light fields with random fluctuating features are known as partially coherent light. When partially coherent light interact with nano-objects (i.e. solids or voids), new characteristics emerge (e.g. coherence vortex, fully-incoherent point-pairs) that are absent in fully coherent scattered fields. In this paper, we review the fundamental metrics for characterising partially coherent light and how such metrics can be used to reveal some of the hidden features of partially coherent light interacting with nano-objects.

关键词： Coherence Optical scattering Optical vortices Optical sensors Optical beams Optical polarization Biomedical optical imaging

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Tunable metamaterials based on ferrites and the applications

Tunable metamaterials based on ferrites and the applications

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International Workshop on Metamaterials

作者： Yongjun Huang Guangjun Wen Weiren Zhu School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

The research of metamaterial is one of most important global activity that promises to change the lives in many different ways. Flexibly controlling the properties of metamaterials by tunable designs makes metamaterials more colorful and thus enables a family of new electromagnetic devices. In this paper, the use of ferrites on design of tunable metamaterials has been reviewed. Owing to the novel properties of ferrites, including broadband negative permeability and tunability of permeability, a great many researchers have focused on investigating ferrites based metamaterials and the relevant applications. This paper reviews the design, theoretical analysis, numerical and experimental demonstrations, and the potential applications of the ferrite based metamaterials.

关键词： Metamaterials Ferrites Wires Permeability Magnetic resonance Helium

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Determination of the effective constitutive parameters of active transmission line metamaterials

Determination of the effective constitutive parameters of ac...

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International Workshop on Metamaterials

作者： Li-Ming Si Weiren Zhu Xin Lv Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and Electronics Beijing Institute of Technology Beijing China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

This paper presents an alternative approach, based on the transmission line theory, for determination of the attenuation constant (α), phase constant (β), characteristic impedance (Zo), refractive index (n), effective permittivity (ε) and effective permeability (μ) for active transmission line (TL) metamaterial. When active elements are introduced into the lossy TL meta-material, the gain acquired from the active elements should be evaluated quantitatively against the attenuation due to the loss in order to avoid ambiguities in determining the signs of the effective constitutive parameters. In stead of directly determining the characteristic impedance from S-parameters, we introduce the reflection coefficient as an intermediate quantity to assist solving the characteristic impedance. This paper shows demonstration of this method with an example of active TL metamaterial.

关键词： Metamaterials Impedance Refractive index Attenuation Magnetic materials Permeability

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Tunable ferrite based triple-band μ-negative metamaterial

Tunable ferrite based triple-band μ-negative metamaterial

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Haibin Sun Guangjun Wen Yongjun Huang Jingping Zhong Weiren Zhu Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks School of Communication and Information Engineering University of Electronic Science and Technology Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We present a tunable triple-band μ-negative metamaterial composed of loop resonator and ferrite. The tunable triple-band-stop transmission spectrum of such metamaterial is investigated numerically by full wave simulations. Moreover, the corresponding effective parameters are retrieved to illustrate the tunable μ-negative characteristic.

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Plasmonic waveguides with resonant-cavity structures for nanophotonics applications

Plasmonic waveguides with resonant-cavity structures for nan...

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International Conference on Quantum Electronics (IQEC)

作者： Asanka Pannipitiya Ivan D. Rukhlenko Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department ofElectrical and Computer Systems Engineering Monash University Clayton VIC Australia

We develop approximate analytical models that describe transmission characteristics of plasmonic slot waveguides coupled to resonant-cavity structures. These models provide deeper insight and pave the way for rapid de... 详细信息

ISBN: (纸本)9780977565771

关键词： Optical waveguides Waveguide junctions Couplers Plasmons Optical filters Power transmission lines

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Optimum design of single-core nanowaveguide for surface plasmon polaritons

Optimum design of single-core nanowaveguide for surface plas...

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International Conference on Quantum Electronics (IQEC)

作者： Dayan Handapangoda Malin Premaratne Ivan D. Rukhlenko Advanced Computing and Simulation Laboratory (AxL) Department ofElectrical and Computer Systems Engineering Faculty of Engineering Monash University Clayton VIC Australia

We show that an optimal dielectric cladding thickness exists, at which the losses in a metallic nanowire can be entirely compensated with minimal gain. We also propose design guidelines that ensure strong confinement ... 详细信息

ISBN: (纸本)9780977565771

关键词： Optical surface waves Metals Dielectric losses Surface waves Integrated circuit interconnections Optical pumping

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Design and implementation of edge detection algorithm in dsPIC embedded processor

Design and implementation of edge detection algorithm in dsP...

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International Conference on Information and Automation for Sustainability (ICIAfS)

作者： Prashan Premaratne Sabooh Ajaz Ravi Monaragala Nalin Bandara Malin Premaratne School of Electrical Computer and Telecommunications Engineering University of Wollongong North Wollongong NSW Australia Centre for Research and Development Army Cantonment Panagoda Sri Lanka Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

The research presented here is an attempt to use a very basic, low cost and non-specialized microcontroller for image processing tasks. The applications emanating from such an attempt will result in inexpensive face detection, intelligent motion sensors to low cost vehicle counting systems. We have been able to develop a system based on Microchip dsPIC microcontroller that implements edge detection of still images. Hardware-based signal processors such as Texas Instrument DSP (Digital Signal Processing) or Field Gate Arrays (FPGA) are generally an expensive solution for image processing applications. On the other hand a conventional 8-bit microcontroller doesn't have enough capability to handle memory intensive DSP algorithms. In this regard, Microchip offers a tradeoff between cost and performance. Although performance does not compete with TI DSPs or FPGAs, the proposed system yet provides a sound platform to perform Signal processing directly on embedded hardware. Our research presents a preliminary approach to perform any type of image processing task using microchip 16-bit Microcontrollers and 16-bit digital signal controllers. Even though this attempt is aimed at Edge Detection, the research opens up possibilities for numerous other algorithms of signal and image processing that can be implemented using the same low cost hardware.

关键词： Image edge detection Hardware Cameras Noise Pixel Libraries

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Dynamic hand gesture recognition system using moment invariants

Dynamic hand gesture recognition system using moment invaria...

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International Conference on Information and Automation for Sustainability (ICIAfS)

作者： Zhengmao Zou Prashan Premaratne Ravi Monaragala Nalin Bandara Malin Premaratne School of Electrical Computer and Telecommunications Engineering University of Wollongong North Wollongong NSW Australia Centre for Research and Development Army Cantonment Panagoda Sri Lanka Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We have developed a dynamic hand gesture recognition system that can simplify the way humans interact with computers and many other non-critical consumer electronic equipment. The proposed system is based on the well-known “Wave Controller” technology developed at the University of Wollongong and will revolutionize video gaming and consumer electronics control interfaces. Currently, computer interfacing mainly involves keyboard, mouse, joystick or gaming wheels and occasionally voice recognition for user input. These modes of interaction have restrained the artistic ability of many users, as they are required to respond to the computer through pressing buttons or moving other apparatus. Voice recognition is seen as unreliable and impractical in areas where more than one user is present. All these drawbacks can be tackled by using a reliable hand gesture recognition system that facilitates interaction between users and computers and other consumer electronic equipment in real time. This will further enhance the user experience as users no longer have any physical connection to the equipment being controlled. This system can also be extended to a sign language system for the benefit of the disabled including those with speech disabilities.

关键词： Gesture recognition Computers Support vector machines Real time systems Classification algorithms Consumer electronics Feature extraction

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