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Terahertz wave generation and propagation in thin-film lithium niobate produced by crystal ion slicing
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) ISRS transient grating excitation and polariton imaging setup. The two excitation beams are derived from the orders of diffraction from a binary phase mask (PM) and are polarized parallel to the crystal optic axis (out of page in figure). Cylindrical lens (CL) orientation is indicated by arrows in the direction of curvature. A diverging lens is used to expand the probe beam to capture polaritons as they propagate across the film. The probe beam makes a small angle with respect to the pump beam to phase match the excitation and probe beams. It is then imaged through a 0.65 numerical aperture microscope objective onto a CCD camera. The sample is imaged slightly out of focus to facilitate phase-to-amplitude conversion.

Image of FIG. 2.
FIG. 2.

Real-space images (raw data) of polaritons with two different wavelengths in a LN film (lower two images) and polariton electric field profiles extending through the film determined through FDTD simulations (upper two images). The electric field is polarized in the direction in both. The spatial periods in the polariton images give the waveguide propagation constant . The simulations illustrate that at wavelengths that exceed the film thickness, the field extends significantly into the air “cladding” above and below the film. Note that the vertical axes in the two pairs of images represent orthogonal sample dimensions. Orientations of the four images with respect to the film are indicated on the right. Optic axis is along .

Image of FIG. 3.
FIG. 3.

(Color online) Dispersion relations for thin film ( thick) and bulk ( thick) LN crystals, determined from experiment (points) and simulations (curves). The increasing deviation between bulk and thin film results as the polariton wavelength increases is due to slab waveguide effects in the film. Only the lowest order slab waveguide mode of the film is reported here.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz wave generation and propagation in thin-film lithium niobate produced by crystal ion slicing