title: Optical characterization of ultra-short Bragg grating on lithium niobate ridge waveguide.
abstract: In this Letter, we report a technique to etch giant aspect ratio nanostructures in lithium niobate. An 8 μm long Bragg grating on a Ti:LiNbO3 ridge waveguide was fabricated by combining optical-grade dicing and focused ion beam milling. The reflectivity was evaluated using an optical coherence tomography system: it is measured to be 53% for the TM wave and 47% for the TE wave. We study by 2D-FDTD the modeled behavior of the electromagnetic field when an angle exists between two consecutive sidewalls of the grating in order to understand the difference between ideal Bragg grating and experimental samples. These simulations allow us to optimize the parameters in order to increase the reflection of the grating up to 80%.
authors.forename: Clément
authors.initials: C
authors.lastname: Guyot
authors.forename: Gwenn
authors.initials: G
authors.lastname: Ulliac
authors.forename: Jean
authors.initials: J
authors.lastname: Dahdah
authors.forename: Wentao
authors.initials: W
authors.lastname: Qiu
authors.forename: Maria-Pilar
authors.initials: MP
authors.lastname: Bernal
authors.forename: Fadi
authors.initials: F
authors.lastname: Baida
authors.forename: Nadège
authors.initials: N
authors.lastname: Courjal