Premium
A Barium Titanate‐on‐Oxide Insulator Optoelectronics Platform
Author(s) -
Cao Yu,
Tan Siew Li,
Cheung Eric Jun Hao,
Siew Shawn Yohanes,
Li Changjian,
Liu Yan,
Tang Chi Sin,
Lal Manohar,
Chen Guanyu,
Dogheche Karim,
Yang Ping,
Pennycook Steven,
Wee Andrew Thye Shen,
Chua Soojin,
Dogheche Elhadj,
Venkatesan Thirumalai,
Danner Aaron
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202101128
Subject(s) - materials science , barium titanate , optoelectronics , pockels effect , lithium niobate , refractive index , waveguide , wavelength , optics , dielectric , physics , laser
Abstract Electro‐optic modulators are among the most important building blocks in optical communication networks. Lithium niobate, for example, has traditionally been widely used to fabricate high‐speed optical modulators due to its large Pockels effect. Another material, barium titanate, nominally has a 50 times stronger r ‐parameter and would ordinarily be a more attractive material choice for such modulators or other applications. In practice, barium titanate thin films for optical waveguide devices are usually grown on magnesium oxide due to its low refractive index, allowing vertical mode confinement. However, the crystal quality is normally degraded. Here, a group of scandate‐based substrates with small lattice mismatch and low refractive index compared to that of barium titanate is identified, thus concurrently satisfying high crystal quality and vertical optical mode confinement. This work provides a platform for nonlinear on‐chip optoelectronics and can be promising for waveguide‐based optical devices such as Mach–Zehnder modulators, wavelength division multiplexing, and quantum optics‐on‐chip.