Figure 2
From: Reconfigurable metasurfaces that enable light polarization control by light
Nonlinear tuning over polarization effects of the plasmonic metasurfaces. (a) Green light (532 nm) is used as a control beam to switch the polarization effects of the nanostructure. The signal and control beams were combined together by a dichroic mirror. A long pass filter (F) with cut-on wavelength at 550 nm was applied to isolate the green light in the transmitted light. (b) Under irradiation of green light, each ethyl-red molecule isomerizes from the trans state to the cis state and then recovers to the original trans state through thermally relaxation in dark. (c) Under green light (4 mW) excitation, both ϕ and χ (solid dots: measured data, dashed lines: simulation results) undergo an obvious blue shift compared with the results without the control beam (circles: measured data, solid lines: simulation results). (d) Measured nonlinear changes in the polarization parameters for various control light powers relative to results without the control beam. Vertical dashed lines indicate the wavelengths at which the power dependences of Δϕ and Δχ are shown in (e).
