Figure 2 | Gradient nonlinear Pancharatnam-Berry LC devices. (IMAGE)
Caption
Figure 2 | Gradient nonlinear Pancharatnam-Berry LC devices. a, Scheme of linear and nonlinear optical modulation based on the fabricated FNLC device with a splay angle of π. b, Polarizing optical microscope images of defect-free gradient polarity patterns of ion-doped FNLCs during the thermal annealing process. Iso: isotropic phase; N: nematic phase; Nx: mesophase; Scale bar: 250 μm. c-e, Polarizing optical microscope characterizations of the polar LC arrangement in the device. These images include (c) an enlarged texture, (d) an image under the cross-polarizing optical microscope with a full wave plate insertion, (e) two images of rotating the analyzer in opposite directions with the included angles of 75° and 105° between the polarizer and analyzer. f, Polarizing optical microscope textures under an in-plane triangular-wave electric field (1 Hz, AC voltage 0.06 V/μm). The red and blue unidirectional arrows indicate the direction of the electric field. Scale bar: 100 μm. (g, h) Extracted intensity profiles from the textures in (e) and (f). Red and blue sets of arrows in (h) denote the corresponding orientations of polar LC directors.
Credit
Hui-Feng Chen et al.
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