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

Abstract

Terahertz phonon-polariton generation and real-space imaging with femtosecond optical pulses are demonstrated in a 10-μm-thick film of single-crystalline lithium niobate that was generated through crystal ion slicing. The film dispersion properties were characterized throughout the polariton wavelength range of 5–100μm, revealing substantial slab waveguide behavior at the longer wavelengths.

Enhanced electro-optical lithium niobate photonic crystal wire waveguide on a smart-cut thin film

“…They have verified that the linear and nonlinear properties are identical to bulk material [7]. They have used the films for THz polariton generation [8], electro-optically tunable second-harmonic generation grating in thin films [9] of periodically poled LN [10], and low votage tunable TE/TM converter [11].…”

Phonon-Polariton Excitation in Coupled Ferroelectric Waveguides

“…In contrast, a cylindrically focused "line" source yields THz plane waves. Using this and other controlled excitation geometries, exploration of polariton propagation in waveguides and patterned crystals [4][5][6] has begun. The confinement of polaritons with in sub-wavelength structures allows guidance and in some cases simplification of the THz waveform.…”

Control of Phonon Polariton Propagation in LiNbO3 Single Crystals

“…Among ferroelectric materials, LiNbO 3 is one of the most promising candidates having a high damage threshold, thereby suitable for the wavelength conversion devise for high power light sources. The phonon polariton dynamics of LiNbO 3 in terahertz region has, therefore, long been studied for decades [3][4]. However, most investigations focus on the A-mode phonon polariton, which can be induced via the diagonal element of nonlinear susceptibility.…”