? Enhancement of light-matter interactions in slow-wave metasurfaces ?

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Presentation transcript:

? Enhancement of light-matter interactions in slow-wave metasurfaces ? Shiyi Xiao1, Qiong He1, Xueqin Huang2, Shiwei Tang1, and Lei Zhou1* 1.State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai, 200433, China 2. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China Motivations: II. Light–matter Interactions Enhancement by Slow-wave Meta-Surface Light-matter Interactions are typically Weak Due to Short light-matter interaction time Question Find an ultra-thin system to support slow-wave along all directions To enhance light-matter interactions Photon conservation Laser SERS Absorption Nonlinear ? Slow down light velocity Enhance light-matter interactions Compresses wave-packet longitudinally Compresses wave-packet laterally Nowadays Slow-wave Device Ultra-thin Vg Vg PCW Nano-Cavity GHz Experiment of Enhancing Absorption PCW Meta-surface Require a Thick medium I. Slow-wave Meta-surface ? linear Adding low loss material. A strong absorption enhancement at slow wave window. Insensitive to incident angle and polarization. Bulk Effect Surface Effect THz Simulation of Enhancing THG The thinner the device, The longer time the device could trap a photon Composite of 3 layer Thickness << working wavelength Experimental Verification Detail parameters for GHz sample Several orders THG enhancement Mechanism output pulse input pulse Waveguide mode h1 h2 Conclusions: Ultrathin metameterial Supporting slow waves along all directions Enhancing light-matter interactions: absorption and THG Hybridized SPP Slow Wave medium Original SPP Delay time strongly enhanced at 5.5 GHz “effective Vg” reduced by 100 times Simulation fit experiment perfectly Both WG mode and SPP are slow-wave! Hybridization effect the anomalous slow-wave [1] M. Notomi, et al., Phys.Rev.Lett. 87, 253902 (2001). [2] T. Baba, Nat. Photonics 2, 465 (2008). [3] X. Huang, et al., Opt. Express 18, 10377 (2010). [4] S. Xiao, et al., Phys.Rev.B 85, 085125 (2012)