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[BK21 SEMINAR] Prof. Seokhyoung Kim (Michigan State University, USA)_2…

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[BK21 SEMINAR] Prof. Seokhyoung Kim (Michigan State University, USA)_2021.06.17

 

Speaker : Prof. Seokhyoung Kim (Michigan State University, USA)

Date : 2021. 6. 17 (THU), 10:00 AM 

URL: https://zoom.us/j/98271830967?pwd=bHNyb2M5SkdZZnFCRlJkUnFKR290UT09

 

Synthetically-Designed Nanomaterial Superlattices for Efficient Control of Light


 

Efficient control of light waves at the nanoscale – including trapping, guiding, absorbing, and emitting photons through resonant optical states – offers opportunities for the development of advanced light-based technologies such as optical data management, quantum information processing, linear and non-linear light generation, and solar energy conversion. In the past decades, chemical synthesis of high-symmetry nanostructures (e.g., nanoparticles) and lithographic fabrication of photonic crystal slabs using various semiconducting and plasmonic materials have propelled the study of fundamental optical cavity modes at or below the diffraction limit. More complex optical interference effects and unnatural meta-photonic properties may arise from periodically ordered lattices of nanoresonators, which necessitates the development of new synthetic tools to create precisely-tailored nanomaterial superlattices that are impossible to make using existing methods. In this talk, I will present two innovative bottom- up synthetic methods that reliably create nanomaterial superlattices with truly nanoscale precision, and show how rationally-designed superstructures can lead to the emergence of unique meta-photonic properties. The first half of the talk will discuss the synthesis of nanowire geometric superlattices (NW GSLs) with complex morphologies. The occurrence of unique narrowband optical coupling between Mie resonances and bound guided states, and optical bound states in the continuum with infinite photon lifetimes in these NW GSLs will be introduced. The second half will present the synthesis of colloidal crystal habits using the complementarity of DNA base pairs that are immobilized on the surface of plasmonic nanoparticles. In this system, I will discuss unnaturally-high effective refractive indices arising from three-dimensional ‘metacrystals’of gold nanocubes and their manifestation as deep- subwavelength mid-infrared multipolar Mie resonances.

 

 

 

Host : Prof. Moon Jeong Park (T.279-2342)

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