Abstract

Biography

Dr Yuvaraja Visagathilagar has over 27+ years of extensive expertise and experience in academia, research, and industry. He graduated with Bachelor of Engineering in Communication Engineering and Doctorate in Engineering (with a highly prestigious scholarship from the Australian Government) in 1996 and 2003 respectively from RMIT University, Melbourne Australia. His dissertation was in “Narrow-band Optical Modulator on Lithium Niobate” for telecommunication applications but it can be applied for other transceivers applications. In research and industry, he has contributed to over 40+ peer-reviewed international journals and conference pubications. He has visited and presented at universities in USA (i.e. UCLA and UCSD), Peregrine Semiconductor Corporation and in Japan (i.e. Science and technology Organisation).He has collaborated with Defence Science Technology Organisation (now DSTG) in Australia where he has contributed in the design, fabrication, packaging and testing of “High-Speed Lithium Niobate Optical Modulator” including documentation of processes for quality certification (ISO 9001) and flip-chip packaging of narrow-band optical modulators on Lithium Niobate and Ceramic materials. He has extensive academic teaching as a lecturer and post-doctorate research fellow in Photonics, Fibre Optics & System, RF System, and Integration where he was involved in research of novel design of narrowband optical modulators. In early years, his research has been in Narrow-band Lithium Niobate Modulators but also in finding a solution for packaging of optoelectronic devices (i.e. ceramic and Silicon materials). During the collaboration, he worked with sub-contractors in system integration and packaging of the modulator devices in hermetically sealed packages for defence applications. In 2006, he joined “Future Fibre Technologies Ltd” who are the global leading organisation in optical sensing technologies and has extensive experience over 9 years in optical sensing. He was a senior manager and held positions as Senior Fibre Systems Engineer, R&D Team Leader and Applications Engineering Manager where he contributed in the company products enhancements and novel products design. He has contributed to 2 patent solutions for novel systems in optical fibre sensing and contributed to over 110+ reports with fellow colleagues and R&D teams (not published due to commercial-in-confidence). From July 2016 to March 2018, he was a Senior Academic at RMIT University for postgraduate and undergraduate courses in Electrical Engineering Analysis using Matlab, Electronic Engineering, Radar technologies, Communication systems, Optical/Photonic Engineering, Microwave Circuits & System and Advanced Mathematics for various program levels (or years). He contributed to the development teaching materials of a core course in Optical Fibre Systems and Networks for Bachelor and Master’s Program including supervising for over 10+ projects in undergraduate and postgraduate students with a minor thesis. Since April 2018 to June 2020, he is a Senior Academic with the Department of Electrical and Electronics Technology & Engineering, Applied Engineering College (AEC), Riyadh, Kingdom of Saudi Arabia which is affiliated with Lincoln College International and University of Hull, UK with accreditation of Colleges of Excellence by the Government of Kingdom of Saudi Arabia where he is undertaking teaching in Electrical and Electronics technologies & principles for various Bachelor level program. He has been a senior supervisor for over 30+ projects demonstrated and a minor thesis. In July 2020, he is a researcher undertaking photonics research into reservoir computing and senior academic in lecturing a topic in Optical Fibre Communication Systems, Digital Electronics projects using Altium to design & built a Digital Oscilloscope and Microwave/RF Systems with ©Cadence and Electronic Engineering at the University of Melbourne (Australia) and in January 2021, he joined RMIT University as a researcher and senior academic undertaking research in optical fibre systems and transmission with high-level multi-disciplinary engineering team. Since January 2022, he joined QinetiQ Australia as a Principal Engineer (Senior RF/EMI/EMC Systems Engineer) as a Design and Advisory role providing his expertise & experience in defence and government projects with key interest in Microwave/RF/Radar Communication Engineering, coherent detection optical sensing for pipelines, undersea exploration, seismic detection and temperature sensing, high-speed and narrow-band optical modulators. Recently in March 2023 was awarded with accreditation & certified with the Engineers Australia (EA) Chartered Professional Engineering (CPEng) and in the National Engineers Register (NER), APEC Engineer and IntPE(Aus). He has a distinguished professional engineering career, he is an active Senior Member of the IEEE for over 28+ years’ service where he is the Chair of the Victorian IEEE Electron Devices & Photonics Society Joint Chapter and representative in the Section Committee, Australia from 2017 He is a active member of IEEE where he is a key volunteer for the Senior Member Elevation reference in Victoria, Australia (or globally), Member of OSA, SPIE, AP-MTT, AIP, AOS, BCS and certified in PRINCE2® & system engineering. He is in various editorial boards for peer-reviewed international journals and key reviewer for many international scientific journals and conferences. He has presented at various international and local conferences as Plenary, Keynote, Invited and has been asked to provide a welcome talk at conference. Other interests include and on-going, provides professional engineering consultancy to organisations locally and globally but passionate about teaching high school students from year 7 – VCE & other states in all Mathematic, Physics, System Engineering and Technology.

Abstract

Terahertz Photonics in 6G: Ultra-High-Speed Wireless Communication, Sensing/Imaging Capabilities, and Smart Healthcare

Dean/Prof.Katsuhiro Ajito,

Department of Information Technology, Faculty of Technology, International Professional University of Technology in Osaka, JAPAN

Abstract:

With the sixth generation (6G), a wide frequency band is being considered for ultra-high-speed wireless communication. Within this band, extremely high frequencies known as sub-hertz or terahertz (THz = trillion hertz) radio waves ranging from 100 GHz to 3 THz are being explored. The use of higher radio frequencies is advantageous for high-speed data transfer because they exhibit light-like properties, such as higher directivity.

Base station antennas for higher radio frequency require the deployment of numerous antennas because of the narrower coverage area. The technology to be integrated into smartphones is still in the future, but commercial use in backhaul (relay lines connecting wireless base station antennas to the core communication network) and fronthaul (relay lines connecting wireless base stations and antenna units when they are separated) has already been standardized internationally in the 300 GHz band, specified as 252 GHz to 325 GHz, with a communication speed of 100 Gbps, by IEEE 802.15.3d-2017 in 2017.

Japan has been at the forefront of research in the 300 GHz band, with successful experimental demonstrations achieving 40 Gbps over 160 meters in the Japan-EU project called ThoR (TeraHertz end-to-end wireless systems supporting ultra-high data rate applications) from 2018 to 2022. Additionally, at the 2019 World Radio Conference (WRC), contributions from Japan, Germany, IEEE, and others led to the standardization of the 275 GHz to 450 GHz range under agenda item 1.15.

Furthermore, taking advantage of shorter wavelengths and higher light-like directivity, future developments are envisioned where wireless communication networks themselves possess sensing capabilities for applications such as positioning and object detection using radio frequencies. At 300 GHz, it is likely that ultra-precise positioning can be achieved even with errors on the wavelength scale. Additionally, smart healthcare using 6G network and 6G photonics are also discussed.

Biography

Katsuhiro Ajito received his Ph.D. degree in applied chemistry from the University of Tokyo, Japan, in 1995. He was a Distinguished Technical Member of THz-wave applications at NTT Science and Core Technology Laboratory Group in Atsugi, Japan. He joined NTT Basic Research Laboratories in 1995, where he conducted studies on glutamate in single synapses in the brain using Raman spectroscopy and laser tweezers from 1995 to 2007. His current research interests include terahertz photonics in 6G for ultra-high-speed wireless communication and sensing/imaging capabilities.In 1999, he was awarded the Young Scientist Award for the Presentation of an Excellent Paper from the Japan Society of Applied Physics (JSAP). From 1995 to 2019, he served as the Executive Director and Chair of the Terahertz Spectroscopy Division of the Spectroscopical Society of Japan (SSJ). He was also the Secretary of the Terahertz Interest Group in the IEEE 802.15 Working Group for wireless personal area networks from 2011 to 2013 and the Chair of the Micro/Nano Electromechanical Systems and Bio/Medical Analyses Area of the International Conference on Solid State Devices and Materials in JSAP from 2012 to 2015. Since 2021, he has been working at the Department of Information Technology, Faculty of Technology, International Professional University of Technology in Osaka, serving as the Chair, and has been the Dean since 2022. He is a member of IEEE, JSAP, SSJ, and the American Chemical Society.

Abstract

The small and portable drone relay system is an important component of airborne laser communication and a prerequisite for maintaining normal communication links. This article proposes a non-confocal axis alignment method for airborne laser communication, and designs and implements an airborne laser tracking communication system. The system consists of a ground transmitting end and an airborne relay end. The ground transmitting end uses a camera and a pan head for image tracking. The airborne relay end uses a four quadrant detector as the detection unit, and a micro motor as the control servo system to control the two-dimensional mirror with a large dynamic adjustment range to adjust the beam and achieve non confocal axis alignment between the receiving and transmitting sides. The avalanche photodiode is used as the communication unit. On this basis, airborne laser communication experiments were conducted. The experimental results show that the tracking accuracy of the system is 13.98 μrad, and the amplitude of the electrical signal output by the signal detector is 23.0 mV. This method can achieve alignment without the need for data retrieval, and can quickly establish a transmission link while also achieving the establishment of a reverse link, without the need for an air stable platform. The feasibility of applying this method to airborne laser communication systems has been verified.

Biography

Xizheng Ke, Ph.D., Second-level Professor, deputy director of Shaanxi Provincial Key Laboratory of Intelligent Cooperative Network Military-civilian Joint Construction. Famous Teaching Teacher of Shaanxi Province, Fellow of Chinese Institute of Electronics, Foreign academician of Russian Academy of Natural Sciences, Director of Chinese Optical Engineering Society, Standing Director of Shaanxi Optical Society.

Abstract

Optogenetics has made a strong impact in neuroscience by providing unprecedented spatiotemporal resolution in reading and writing neural codes with relatively lower invasiveness. In optogenetics, a genetically encoded light-sensitive protein is introduced into cells to make them sensitive to light. The expressed protein generates either inward or outward current in the presence of light, and can reversibly change the cell membrane voltage. Thus, the activity of these cells can be controlled and monitored with light. Optogenetics also enables all-optical control and recording of cellular activity in living tissue and opens up exciting prospects for optical neural prostheses. Recently, the first successful human trial of optogenetic retinal prostheses and promising results in cardiac optogenetics have been demonstrated.

Computational modelling of optogenetic systems has made significant contributions in developing a better understanding of the photocurrent dynamics in opsin molecules and the change in membrane potential in opsin-expressing cells in response to light. Computational models help in quick virtual testing of newly developed light-sensitive proteins in different cell types within realistic tissue and organ-level settings.

The talk would focus on our recent research in computational optogenetics for low-power, high-fidelity and high-frequency excitation, inhibition and bidirectional control of different neurons in the brain and cardiomyocytes in the heart, with newly discovered light-sensitive proteins and opsin pairs. The study not only provides a better understanding of the mechanism to efficiently control different cells but also allows optimization of their response.

Desensitization of photocurrent is a fundamental problem while using faster opsins. Under sustained illumination, the photocurrent in fast opsins desensitizes with time and results in spike failure below a certain threshold. Recently, we have shown that co-expressing step function opsins with fast channelrhodopsins can overcome this challenge. It has also been shown that ultra-low power deep sustained optogenetic excitation or suppression of electrical activity in human cardiomyocytes can be achieved with the newly discovered ChRmine opsin. The future prospects of optogenetics will also be discussed.

Biography

Professor Sukhdev Roy received the theBSc (Hons) Physics degree from Delhi Univ, in 1986, MSc Physics from DEL in 1988, and PhD from ift Delhi in1993. He joined the DayalbaghEducational Institute in 1993, where he is at present the Head of theDepartment of Physics and ComputerScience. He has been a Visiting Professor at many universities that include, including Harvard (USA) Waterloo(Canada), Würzburgand Regensburg (Germany) Osakajapan) City University, and Queen Mary University of London (UK) TIFF, Mumbai, and Sc Bangalore (india). He has also been an Associate of the international Centre for Theoretical Physics, Trieste, Italy, and is a Member of the Global Panel of MIT Technology Review, Prof. Roy has made significant contributions in Photonics that encompass nano-blo-photonics, silicon and neuro photonics, fiber optics, and optical computing. His experimental and theoretical research on nano-bio-photonic systems that includes low-power and high-frequency optogenetic control of neural spiking, defines a new paradigm of technological convergence and innovation and opens up fascinating prospects for energy-efficient, ultrafast and low cost all-optical information processing sensing energy conversion, and healthcare. He has won a number of awards and fellowships that include, the AICTE Career Award for Young Teachers in 2001, 15PS Invitation Fellowship, japan in 2004, HC Shah Research Endowment Prize by Sardar Patel University in 2006, 1st IETE BB Sen Memorial Award in 2007, IETE-Conference on Emerging Optoelectronic Technologies Award in 2012, IETE-M Rathore Memorial Award in 2016, the Systems Society of India's National Systems Gold Medal in 2016, and the Distinguished Alumni Award by the Dayalbagh Educational Institute in 2021. He also has been awarded seven best paper awards in international and national conferences. He has published 175 research papers in reputed journals and conference proceedings and 11 book chapters. He chaired the 8th World Conference and Expo on Nanoscience and Nanotechnology, Philadelphia, the USA in 2020. He has delivered more than 100 invited talks in India and abroad that include Keynote Addresses and Plenary Talks at International Conferences that include the prestigious international Year of Light.commemorative Keynote Address at the 38th Convocation of the International Council of Academies of Engineering and Technological Sciences (CAETSL in 2015 and at the Annual Meeting of American Physical Society in 2008. He was the Guest Editor of the March 2011 Special issue of ET Circuits. Devices and Systems Journal 10 on Optical Computing. He is an Associate Editor of IEEE Access and is a member of the Editorial Board of Optics and Photonics journal He is also a Senior Member of IEEE (USA) and a Fellow of the Indian National Academy of Engineering, the National Academy of Sciences India, IETE (India), and the Optical Society of India. He is listed in the recent Stanford researchers study of Top 2% in World Ranking of Scientists-2020, in Optoelectronics and Photonics.

Abstract

 Synthesis of Semiconductor Heterostructures for Optoelectronic Devices

Prof. Dr. Govind Gupta1,2

1Sensor Devices & Metrology Group, CSIR - National Physical Laboratory (CSIR-NPL), Dr K. S. Krishnan Road, New Delhi 110012, India 

2Academy of Scientific & Innovative Research, (AcSIR), CSIR-HRDC Campus, Ghaziabad, Uttar Pradesh 201002, India

Heterostructure-based devices have shown great potential in various fields, including electronics, photonics, and sensing. Semiconductor heterostructures were grown by physical & chemical vapor evaporation techniques. A variety of optoelectronic devices have been designed and fabricated with unique morphology exhibiting higher photocurrent generation and significantly enhanced responsiveness optical illumination. The developed device taps the broad wavelength range from Deep UV to the Mid-NIR spectrum. The fabricated device exhibits a substantially low dark current and fast time-correlated transient response and very high photo responsivity in a self-powered mode of operation. These devices demonstrate broadband optical response with state-of-the-art performance parameters in the photovoltaic and photoconductive modes of operation. I’ll discuss some of our recent findings in detail with possible mechanisms.

Biography

Prof. Dr. Govind Gupta is a Senior Principal Scientist & Head Sensor Devices & Metrology Group at CSIR-National Physical Laboratory, A National Measurement Institute of India, New Delhi, India & Professor Academy of Scientific & Innovative Research (AcSIR), India. His core area of expertise is the growth of exotic semiconducting materials, including nitrides, metal oxide & two-dimensional materials. Dr. Govind is developing intelligent and highly responsive optical sensors to detect harmful electromagnetic radiations and gas sensors to detect environmental pollutant gases. He has published more than 295 research articles in high-impact international scientific journals with more than 6200 citations and 9 book/book chapters. He is an elected Fellow of the Royal Society of Chemistry, UK (FRSC), Fellow of the Institute of Physics, UK (FInstP), Fellow of the Institute of Electronics & Telecommunication Engineers, India (FIETE), Fellow of Electron Microscopy Society of India (FEMSI), Senior Member of IEEE, USA (SMIEEE), and Associate Academician of the Asia Pacific Academy of Materials (APAM). Recently, he has been awarded International Exchange Award by one of the most prestigious, the Royal Society, UK, for performing collaborated research at the University of Cambridge, UK. Besides, he has been conferred numerous awards, including the Material Research Society of India (MRSI) medal, the Young Scientist Medal from National Academy of Sciences, India (NASI), BOYSCAST fellowship and Young Scientist Project Award from Ministry of Science & Technology, India, etc. He is also a visiting scientist to prestigious universities worldwide, including the University of Rutgers, New Jersey, USA, and Humboldt University, Berlin, Germany.

Abstract

Photonic optical co-packaging can increase the interconnecting bandwidth density and energy efficiency for quantum computing, 5G, and AI applications, and datacenter interconnections. One of the main challenges to making such advanced packages is to develop a high-yielding and scalable assembly process for cost-effective high-volume manufacturing. In this presentation, we will investigate a selected Intel co-packaged photonic assembly, and its various components and discuss several assembly challenges and their solutions. Specifically, dispense, chip attach, and Laurentide coupler attach strategies will be presented to manage 3D stacking warpage and product reliability.

Biography

Jonas G. Croissant completed his PhD in chemistry, materials science and engineering from the Ecole Nationale Superieure de Chimie in Montpellier (France) in 2014 and then conducted joint post-doctoral studies at King Abdullah University of Science and Technology (KAUST, Saudi Arabia) and the University of California, Los Angeles (UCLA, USA, CA). From 2017 to 2019, he was a professor of chemical engineering at the University of New Mexico (UNM, USA, NM). Since 2019, he joined Intel Corporation’s technology development organization and now focuses on the prototype-to-HVM innovation of photonic optical co-packaging assembly for next-generation products. He holds five Intel packaging patents, his silica hybrid nanomaterials and films research yielded 50 peer-reviewed publications, 3 book chapters, and 2 patents, and has served as an expert reviewer for European funding agencies and top global peer-reviewed publishing groups (e.g. Nature Publishing Group).

Abstract

                                               Uniting Distant Atoms: Exploring Shared Radiant Modes in Nanophotonic Waveguides

Hamidreza Siampour 

Centre for Quantum Materials and Technologies, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK 

In this abstract, we highlight recent advancements in the field of nanophotonic waveguides for quantum optical devices and their potential for quantum communication and sensing.

In the first part, I discuss the development of integrated quantum photonic circuits based on dielectric-loaded plasmonic waveguides with accurately positioned nanodiamonds containing single vacancy centers [1-4]. By combining resonant and plasmonic enhancement, we significantly increase the spontaneous emission rate of single photons.

Moving on to the second part, I present a chiral nanophotonic waveguide platform with embedded quantum dots that enables both Purcell-enhanced emission and strong chiral coupling. We observe record-high Purcell factors for quantum dots emitting in the slow-light spectral region, and demonstrate chiral routing of spin-carrying photons with exceptional Purcell factors [5].

These advancements, combining plasmonic and photonic crystal waveguide modes, enable strong bonding through radiation coupling in a shared mode. They pave the way for nanoscale functional quantum devices and scalable quantum optical networks.                                                                                                                                 

Biography

H. Siampour is currently a Lecturer at Queen's University Belfast, where his research primarily revolves around investigating the interplay between nanophotonics and quantum optics. Before his current role, he held the position of Research Associate at the University of Cambridge, working on the development of a quantum simulation platform using interacting spins in diamond. Prior to that, he was a Postdoc at the University of Sheffield, working on the development of a semiconductor nanophotonic platform for directional spin-photon coupling. He obtained his PhD degree in Nano-optics from the University of Southern Denmark, with his thesis titled "A Nanophotonic Platform for Quantum Optical Integrated Circuits"

Abstract

Zinc Oxide is still an important substance in macroscale and nanoscale due to the huge properties under different pressures and temperatures, because of its chemical bonds are between covalent and ionic. In this work we are analyzed the behaviour of zinc oxide rocksalt and wurtzite behavior under the range of pressure 0-100GPa and the range of temperature 300-3000K. We are investigated Molecular Dynamics and DL_POLY on Raven Supercomputer of Cardiff Universityin  UK to compare between these bonds under previous conditions. We are used 9a x 9b x 9c as a dimension of our simulation box; we used 5832 atoms of rocksalt and 2916 atoms of wurtzite. Our results are in the vicinity of available data; this information is very important in many industrial fields.

Biography

Yahia CHERGUI is an assistant Professor in Electrical & Electronics Engineering Institute, Boumerdes Algeria. He has completed his PhD from Badji Mokhtar University in Annaba, Algeria. He did all his PhD work in Cardiff University in UK. His research field is Physics(condensed matter, and soft matter simulation by molecular dynamics). He has many published articles and international conferences. He has been serving as a referee with condensed matter journal (IOP), Energy journal (Elsevier), and American Journal of Modern Physics.