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Schematic diagram of flexible photonic crystal structure controlled by a pair of NEMS/MEMS actuators. The flexible photonic crystal is composed of pillars (white cylinders) embedded in a flexible polymer film. The actuators are made of metal or silicon.
(a) Schematic diagram of triangular PC structure of pillars (dark circles) in a PDMS film (light background). (b) Dispersion curves of perfectly triangular (outer curve), 5% stretched (middle curve), and 10% stretched (inner curve) PCs calculated for a normalized frequency of 0.39. The hexagon is the first Brillouin zone boundary.
(a) Refraction angles calculated from the dispersion curves in Fig. 2(b). Angles are measured from the direction, as indicated in Fig. 2(a). (b) FDTD simulations showing the refraction of a Gaussian beam incident on the perfectly triangular PC (upper panel) and 10% stretched PC (lower panel). The incident beam was launched from the bottom and the flexible PC structures were placed in the upper region of the computational domain with the same orientation shown in Fig. 2(a). The incident angle was for both cases.
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