Title: Nanomechanical Metamaterials and Multifunctional Metalenses
Speakers: 英國 University of Southampton, Prof. Bruce (Jun-Yu) Ou
Date and Time: 114/04/10, 2pm～3:30pm
Venue: R228, Innovation Building, CCU

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Short bio:
Dr Jun-Yu Ou, known as Bruce Ou, is an Associate Professor at the School of Physics and Astronomy, where he leads research on flat optics(metalens) for multifunctional microscopy, AI-enabled nanoimaging, and nanome-chanical metamaterials. His research has led to impacts on the fields of nanophotonics and nanomechanics. He was awarded an EPSRC Doctoral Prize Fellowship in 2014 and the Institute of Physics Doctoral Research Prize in 2015. His research has led to impacts on the fields of nanophotonics and nanomechanics as evi-denced by 80 high-profile journal publications, and 160+ conference papers.
His work has also been internationally recognized by invited presentations at major conferences such as SPIE Photonics and CLEO. Furthermore, his success in the area of nano-optomechanics and metasurfaces has at-tracted global attention from both academic (Nature, Nature Photonics) and commercial news outlets (BBC, Financial Times).
His research interests are in the areas of metamaterials, nano-optomechanics, metalens for imag-ing/metrology, and AI for nanometrology.

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Title: Nanomechanical metamaterials and multifunctional metalenses
We first overview recent advances in plasmonic or dielectric nanomechanical metamaterials fabricated on elastic nanomembranes of silica or silicon nitride. Such metamaterials allow nanometric displacement of their building blocks under external forces and can be reconfigured with external stimuli to achieve optical modula-tion at high frequencies. Mechanical and optical resonances enhance the magnitude of actuation and optical response within these nanostructures, which can be driven by electric signals of only a few volts, microwatt optical or acoustic signals. This approach allows a range of functionalities to be achieved through optical el-ements of sub-micron thickness including sensing, light modulation, and nonlinear effects.
In the second part of the talk, we will showcase a few multifunctional microscopes: A visible compact zoom microscope with three magnifications constructed by two pieces of glasses (metalenses) with on-axis tri-focal planes and no moving parts. A simultaneously chiral and achiral microscope with three independent channels, a high magnification of 53X, and a diffraction-limited resolution. A compact dual-mode microscope working at near-infrared (1550nm) system with a 0.7λ edge-enhancement resolution and 58X magnification using engi-neered metalens. Our results could open new applications in biomedical imaging, machine vision, and semi-conductor inspection.

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Contact Person:
Prof. Guo-En Chang, 機械工程學系
imegec@ccu.edu.tw