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 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%.
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
Shawn Yohanes Siew, Eric Jun Hao Cheung, Haidong Liang, Andrew Bettiol, Noriaki Toyoda, Bandar Alshehri, Elhadj Dogheche, and Aaron J. Danner
Opt. Express 26(4) 4421-4430 (2018)
Ryo Takigawa, Eiji Higurashi, Tetsuya Kawanishi, and Tanemasa Asano
Opt. Express 22(22) 27733-27738 (2014)
Martin F. Volk, Sergiy Suntsov, Christian E. Rüter, and Detlef Kip
Opt. Express 24(2) 1386-1391 (2016)