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Based on the concept of spin rotation coupling, we propose and realize a novel nonlinear metasurface with homogeneous linear optical properties but continuously controllable phase of the local effective nonlinear polarizability. The continuous phase control over the nonlinearity is experimentally demonstrated for second and third harmonic generations by using nonlinear metasurfaces consisting of nanoantennas...
3D chirality is shown to be unnecessary for introducing strong circular dichroism for harmonic generations. Specifically, near‐unity circular dichroism for both second‐harmonic generation and third‐harmonic generations is demonstrated on suitably designed ultrathin plasmonic metasurfaces with only 2D planar chirality. The study opens up new routes for designing chip‐type biosensing platform, which...
Two series of quadrupolar diphenylamino‐endcapped oligofluorenes, PhN‐OF(n)‐NPh (n=2–5) and PhN‐OF(n)‐TAZ‐OF(n)‐NPh (n=1–4), which have an electron‐withdrawing 1,2,4‐triazole (TAZ) moiety as central core, with D–π–A–π–D structural motif (D=donor, A=acceptor), have been synthesized by palladium‐catalyzed Suzuki cross‐coupling of 9,9‐dibutyl‐7‐(diphenylamino)‐2‐fluorenylboronic acid and the corresponding...
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