Title: Collective resonances in metasurfaces

Prof. Jaime Gómez Rivas

报告地址：激光楼116

时间：11月10日11:00

Abstract:

Small nanoparticles behave as dipolar resonators with a resonant frequency determined by their size. When these resonators are placed in a periodic array forming a metasurface, they can couple with diffraction orders forming collective resonances, which are called surface lattice resonances (SLRs). SLRs lead to considerable field enhancements over extended areas. If two resonators that are detuned in frequency are placed in the same array, their SLRs will interfere, leading to a Fano resonance. The linewidth of the resonance decreases as the detuning between the two resonators is reduced. This line width should vanish when the resonators become equal in size. In this situation, the resonance becomes a bound state in the continuum (BIC). BICs cannot couple to far-field radiation and are characterized by infinite lifetimes. This makes them extremely interesting for applications in communication technology, sensing, andnonlinear optics, as well as for enhancing light-matter interaction. In this presentation, I will discuss nanoparticle arrays supporting SLRs and BICs for solid-state lighting applications, where directional enhanced photoluminescence and electroluminescence can be achieved. The large-field enhancement of SLRs can also lead to strong light-matter coupling and exciton-polariton condensation, resulting in a laser-like emission. Polariton lasers have low thresholds, which can be further reduced by controlling the losses with low-loss cavities formed by BICs.

Short CV:

Jaime Gómez Rivas received his PhD in 2002 at the University of Amsterdam (The Netherlands) for his work on light transport in disordered media. From 2002 until 2005, Gómez Rivas worked as a postdoctoral researcher at the RWTH Aachen (Germany) on THz spectroscopy, initiating the field of THz plasmonics. In 2005, he became a project leader at the FOM Institute for Atomic and Molecular Physics (AMOLF) in Amsterdam, leading the group Surface Photonics. This group was located at Philips Research in Eindhoven (The Netherlands) to bring blue-sky research into applications. Gómez Rivas group pioneered the work of plasmonics for solid-state lighting. In 2010 Gómez Rivas became a part-time professor at the Eindhoven University of Technology (TU/e) and group leader at AMOLF. After 10 years of fruitful collaboration with Philips, the group of Gómez Rivas moved in 2015 to the TU/e and the Dutch Institute for Fundamental Energy Research (DIFFER) and in 2018 fully to the TU/e, where it works on strong light-matter coupling, polaritonic devices, and THz metasurfaces. Gómez Rivas is co-founder of the start-up TeraNova B.V. dedicated to the development and commercialization of instruments for optical metrology. He is co-author of more than 190 peer-reviewed articles and co-inventor of more than 25 patents.