Title: Beyond Traditional Optics: Harnessing Dielectric Metasurfaces for Advanced Light Manipulation

Speaker: Son Tung Ha, IMRE, A-Star, Singapore

Time: 3:00pm, Aug 25(Friday) 2023

Location: 理科楼C109

Abstract:

Rapid advancements in nanophotonics have transformed our ability to control light at the nanoscale, reshaping its interaction with matter [1]. Among the recent breakthroughs, photonic bound states in the continuum (BICs) have emerged, enabling the confinement and enhancement of light within specific electromagnetic spectra ranges and momentum space. These developments offer significant potential in many optoelectronic applications.This presentation delves into leveraging the unique attributes of photonic BICs to forge innovative pathways for robust light-matter interactions and amplification. We will explore the design and realization of nanostructured systems supporting BICs, showcasing our latest experimental findings in this field. The spotlight will be on light amplification through interactions with gain media, revealing prospects for low-threshold lasers [2-5] and strong light-matter interactions down to single photon level [6-7]. By capitalizing on these resonant states, we can pave the way for efficient nanophotonic devices, opening new avenues in light-emitting devices, optical communication, sensing, and quantum technologies.

Biography:

Dr. (Tony) Son Tung Ha is a Principal Investigator and Deputy Head of Advanced Optical Technologies Department at the Institute of Material Research and Engineering, A*STAR, Singapore. He received Ph.D (2018) in Applied Physics from the School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore. He also received Master’s degree in Chemical Engineering from Korea Advanced Institute of Sciences and Technologies (KAIST), South Korea. Dr. Ha currently leads a research team called Novel Light Source (NLS) group, focusing on metamaterials and their applications in LIDAR, light-emitting diodes and nanolasers. His group is also interested in strongly coupled light-matter interactions such as exciton-polariton systems and optical manipulations of single photon emitters for quantum optics. He has published over 40 scientific articles& international patents with a total citation of >4,000 and an H-index of 21. His research has been published and highlighted in top-tier scientific outlets, including Nature Nanotechnology, Nature Photonics,Light Science & Applications, etc. Dr Ha has secured various competitive research grants, including the A*STAR Strategic Fund in 2021 (400k SGD, co-PI), the Singapore Young Individual Research Grant in 2021 (250k SGD, PI) and A*STAR Programmatic Fund in 2022 (10 mil SGD, co-PI).

References

[1] R. P. Domínguez, S. T. Ha, A. I. Kuznetsov, Active and tunable nanophotonics with dielectric nanoantennas, Proceedings of the IEEE, 108, 5, 749-771 (2020).

[2] S. T. Ha, Y. H. Fu, N. K. Emani, Z. Y. Pan, R. M. Bakker, R. P. Domínguez, and A. I. Kuznetsov, Directional lasing in resonant semiconductor nanoantenna arrays, Nature Nanotechnology 13, 1042–1047 (2018).

[3] M. Wu, S. T. Ha, S. Shendre, E. G. Durmusoglu, W. K. Koh, R. P. Domínguez, H. V. Demir, A. I. Kuznetsov, Lasing in Colloidal Nanoplatelets via Dielectric Mie-Resonant Bound States in the Continuum, Nano Letters 20 (8), 6005-6011 (2020).

[4] S. T. Ha, R. P. Domínguez, A. I. Kuznetsov, Room-temperature multi-beam, multi-wavelength bound state in the continuum laser, Advanced Optical Materials 10 (19), 2200753 (2022).

[5] T Do, M. Nonahal, C. Li, V. Valuckas, A. I Kuznetsov, H. S. Nguyen, I. Aharonovich, S. T. Ha, Room-temperature strong coupling in a single photon emitter-dielectric metasurface system, arXiv:2212.06544 (2022).