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Confining light to smaller spatial and temporal scales is always desired for deeper understanding of light-matter interaction. Generally, limited by Uncertainty relations including optical diffraction and loss-confinement tradeoff, optical confinement is difficult to go much beyond a wavelength or a cycle of the light. In this talk, I will introduce our recent efforts in confining a light to the spatial/temporal scale of an atom (i.e., 0.1-nm / 0.1-fs scale). Firstly, relying on coherent polarization of bound electrons around interfaces of a dielectric nano-slit waveguide, we spatially confine a 720-nm-wavelength light down to sub-1-nm level (i.e., deep-sub-wavelength confinement) with a peak-to-background ratio higher than 20 dB. Secondly, based on inverse Compton scattering of relativistic electrons in such a deep-sub-wavelength confined light field, we propose to generate attosecond optical pulses with deep-sub-cycle pulse widths.
Limin Tong is a professor of the College of Optical Science and Engineering at Zhejiang University. His research focuses on nanophotonics and applications, including nanofiber optics, ultra-confined optical fields, light-matter interaction in nanostructures and nanophotonics devices. He is a fellow of Optica, and a New Cornerstone Investigator.
Tencent Meeting link: https://meeting.tencent.com/dm/t8ZsCKkt2BwO Meeting ID: 593 269 848, no password