L’Institut FEMTO-ST accueillera le mercredi 6 mars le professeur Cuong Dang et le professeur Sanghoon Chae de l'Université technologique de Nanyang (NTU), Singapour.
Il animeront à partir de 14h des séminaires dans l'amphithéâtre Jean-Jacques Gagnepain.
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Steve Cuong DANG
Nanyang Assistant Professor, CNRS International NTU THALES Research Alliances (CINTRA), Electrical and Electronic Engineering (EEE), Nanyang Technological University (NTU), Singapore
https://personal.ntu.edu.sg/hcdang
Google Scholar: https://scholar.google.com/citations?hl=fr&user=d4trqHAAAAAJ
Title
Excitons, Charges and Dopants in Colloidal Nanomaterials with for Optoelectronics Applications
Abstract
Colloidal nanomaterials with appealing emission characteristics of nanostructures, stability of inorganic semiconductors and solution processability have found their way from lab curiosities to consumer electronics in shopping centers. Understanding their physics and engineering their light emission properties is both fundamental and applied research with many more applications. In this talk, I will first present our recent research and development with Thales on solution-processed perovskite scintillators in various forms from 3D bulk, 2D to 0D (quantum dots). Then, I will focus on our recent works on manipulating excitons, charges and dopants in colloidal nanomaterials (quantum dots and nanoplatelets) to engineer their physical and optical properties, such as Förster resonance energy transfer (FRET), energy flow, multiexciton emission, amplified spontaneous emission. The strong oscillation strength of colloidal nanoplatelets combined with resonant photonic structures allows us to demonstrate strong light-matter interactions. Some demonstrations of our nanomaterials in LEDs and lasers will also be discussed.
Biography
Dr. (Steve) Cuong Dang is an Associate Professor at the School of Electrical and Electronic Engineering, Nanyang Technological University (NTU). He received Ph.D. in Physics and M.Sc. in Electrical and Computer Engineering from Brown University, Rhode Island, USA. His bachelor's degree is in Physics from Hanoi University of Science, Vietnam National University. Dr. Dang's research focuses on nanomaterials, nanophotonics, their physics and their applications in sensors, photovoltaics, light-emitting diodes and lasers. He is also interested in manipulating and exploiting light through complex media. Advanced signal processing techniques and optical physics knowledge are combined to demonstrate applications in biomedical imaging, non-invasive imaging or focusing through scattering media. His research has been published and highlighted in top international journals, including Nature Nanotechnology, Nature Photonics, Nature Communications, Science Advances, Optica and Advanced Materials.
His research and development with QD Vision Inc., Lexington, MA, USA were recognized with the first quantum dot product for solid-state lighting: “Quantum LightTM Optic”. Then it has been further developed as "Color IQ", the world’s first high-volume Quantum Dot product for LCD Televisions. Sony’s BRAVIA 4K 65-inch Televisions that use QD Vision's Color IQ were named Best of Show Product at Consumer Electronics Show (CES) 2013 with their color enhancement.
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Sanghoon Chae
Nanyang Assistant Professor, CNRS International NTU THALES Research Alliances (CINTRA), Electrical and Electronic Engineering (EEE), Materials Science and Engineering (MSE), Nanyang Technological University (NTU), Singapore
https://sites.google.com/view/sanghoonchae/home?pli=1
Google Scholar : https://scholar.google.com/citations?user=FuozHM0AAAAJ&hl=fr&oi=ao*
Title
2D materials integrated SiN waveguides for new chip-based photonic platform
Abstract
By using optical platforms instead of metallic interconnects, photonic devices can achieve both high speed and low power consumption suitable for next generation information processing. Although the state-of-the-art silicon (Si) photonic chips are outstanding optical platforms for light propagation, it requires external active optical components such as light sources and photodetectors. A potential solution comes in the form of atomically thin two-dimensional (2D) materials. Their remarkable optoelectronic properties are widely tunable by doping, strain, and external fields, owing to their atomic thickness and unique characteristics. Moreover, their 2D planar structure is suitable for integration into a photonic platform.
In this talk, I will discuss my current endeavors of novel photonics and optoelectronics functions using 2D materials integrated Si photonic, including light generation, detection, and phase modulations. I will discuss the challenges and opportunities of integrating 2D materials with Si photonic devices, and present experimental results that demonstrate their potential for enhancing device performance. The synergistic combination of 2D materials and Si waveguides results in improved light-matter interactions, enabling applications in high-speed optical communications, sensing, and quantum computing.
Biography
Dr. Chae received his B.S (2010) and Ph.D (2014) in Sungkyunkwan University (SKKU), Korea. Then he worked in Columbia University from 2016 to 2021 as a Postdoctoral Research Scientist. In September 2021, he appointed as a Nanyang Assistant Professor at the School of Electrical and Electronic Engineering (EEE) and the School of Materials Science and Engineering (MSE) at Nanyang Technological University (NTU). Dr. Chae’s research primarily focuses on understanding novel optoelectronic phenomena in atomically thin 2D materials systems, exploring their application as a new class of optoelectronic devices, and integrating their optical functions into Si photonics for information processing.
