Study on Formation of Small Polarization Domain Inversion for High-Efficiency Quasi-Phase-Matched Second-Harmonic Generation Device

Cross-Polarized Photon Pair Source using Type-II Quasi-Phase Matched Parametric Down-Conversion

“…Instead, we aimed to fabricate a device having a poling period 5A1=8.95 ,um, which correspond to the fifth-order QPM condition. We fabricated the periodic poling (PP) structure using voltage application with the full-cover electrode (FCE) method, which makes it able to freely control the contrast of periodic electric field intensity [3]. Figure 2 shows the PP structure observed after chemical etching.…”

Very-Deep Nanometer-Size Domain Inversion in LiNbO3: Proposal for Circular Form Full Cover Electrodes

“…In FCE method, electrodes are formed over a periodic resist patterned to the whole surface of the crystal and inversion voltage is applied to the whole surface where the periodic resist pattern is formed. 12) We reported the calculation of electric field distribution for the rectangular electrode FCE method and domain inversion experiments were performed based on the calculated results. 12) Since the two maximum electric fields exist directly under electrode extreme from electric field calculation in the conventional FCE [ Fig.…”

“…12) We reported the calculation of electric field distribution for the rectangular electrode FCE method and domain inversion experiments were performed based on the calculated results. 12) Since the two maximum electric fields exist directly under electrode extreme from electric field calculation in the conventional FCE [ Fig. 1(a)], it generates nucleation near electrode extreme.…”

“…Thus, domain inversion region spreads more than electrode width, production of small periodic domain inversion is difficult. 12) Detailed electric field calculation, considering both normal and tangential components, for conventional FCE can be found in ref. 13.…”

Depolarization field mitigated domain engineering in nickel diffused lithium tentalate

“…22 Such distorted field line can extend beyond the electrode contact window and cause domain broadening. 23 In this work, we demonstrate a ferroelectric poling scheme on congruent-grown LiTaO 3 that can be immune to the aforementioned shortcomings. It is based upon Landauer's nucleation theory in which bound charges, arising from the divergence of P s at the domain boundary, can constitute a nucleation barrier to prohibit the nucleation of inverted domain and its forward growth.…”