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Authors: G.F Feutmba, A. Hermans, J. George, H. Rijckaert, I. Ansari, D. Van Thourhout, J. Beeckman
Title: Reversable and tunable second-order onlinear optical susceptibility in PZT thin films for integrated optics
Format: International Journal
Publication date: 5/2021
Journal/Conference/Book: Advanced Optical Materials
Volume(Issue): p.2100149
DOI: 10.1002/adom.202100149
Citations: 9 ( - last update: 14/4/2024)
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Second-order nonlinear optical processes enable a wide range of applications used in research and industry. The majority of available second-order nonlinear devices however relies on bulk nonlinear crystals with low second-order nonlinearity. By exploiting the advancements made in integrated optics, materials with large second-order nonlinearity can enable efficient and small-sized on-chip nonlinear devices at low cost. Unfortunately, silicon and silicon nitride, mostly used for photonics integrated circuits exhibit negligible second-order nonlinearity (χ(2)) and alternate materials have to be investigated. Lead zirconate titanate (PZT) thin films with high second-order nonlinearity stand as a good candidate for on-chip nonlinearity. An electric-field induced tuning of χ(2) is demonstrated here in PZT thin films grown on glass substrates with a tuning efficiency of 3.35 pm V−2. Strong second-harmonic generation is recorded and a very high dominant tensor component 𝜒(2)𝑧𝑧𝑧 of 128 pm V−1 is reported. The χ(2) of the PZT thin films can be reversed by poling with a DC electric field at room temperature. This opens avenues for highly efficient and tunable on-chip nonlinear devices.

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