Second Harmonic Light Manipulation with Vertical Split Ring Resonators. Issue 7 (14th December 2018) - Tsai, Wei‐Yi
Abstract: The second harmonic generation (SHG) of vertical and planar split‐ring resonators (SRRs) that are broken centro‐symmetry configurations at the interface of metal surface and air is investigated. Strong interactions, better electromagnetic field confinements, and less leakage into the substrate for vertical SRRs are found. Experimental results show a 2.6‐fold enhancement of SHG nonlinearity, which is in good agreement with simulations and calculations. Demonstrations of 3D metastructures and vertical SRRs with strong SHG nonlinearity majorly result from magnetic dipole and electric quadrupole clearly provides potential applications for photonics and sensing. Abstract : A 3D‐structured, vertical split ring resonator (VSRR), not only establishes stronger field enhancement to boost the nonlinear efficiency but also can produce six different second harmonic generation (SHG) signals generated from a single VSRR. These demonstrations provide an additional dimension to improve the SHG efficiency and also to simplify the sophisticated predesign for nonlinear signal manipulation.