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(Color online) (a) Band diagram for the first Brillouin zone in a squared lattice lithium niobate photonic crystal. (b) Schematic of the simulated structure that consists of holes arranged in a squared lattice. (c) Numerical simulation of the transmitted intensity through the photonic crystal structure performed by 2D-FDTD method.
(Color online) (a) Scanning electron microscope (SEM) image of the fabricated squared lattice lithium niobate photonic crystal. (b) Picture of the electro-optic tunable photonic crystal device.
(Color online) (a) Measured transmission of the photonic crystal for different applied external voltages (0, 40, and ). Inset: Measured transmission of a different LN substrate with the same geometry, where the central peak has been observed. (b) Wavelength shift measured for a at as a function of external positive and negative voltages. (c) Modulation performance of the photonic crystal. The input is a sinusoidal signal at and . The output transmitted signal presents an extinction ratio of . The measurement has been performed at a wavelength of for which the waveguide presents monomodal behavior.
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