Open AccessEfficient arsenic trisulfide vertical grating coupler on lithium niobate for integrated photonic applications
Author(s) -
Msi Khan,
James A. Bain,
Gianluca Piazza
Publication year - 2019
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.44.004558
Subject(s) - lithium niobate , materials science , optics , grating , reflector (photography) , optoelectronics , photonic integrated circuit , photonics , light source , physics
An efficient vertical grating coupler design for arsenic trisulfide (As 2 S 3 ) on silicon dioxide (SiO 2 ) on lithium niobate (LN) is proposed, fabricated, and experimentally verified. We report 4 dB coupling efficiency per grating for vertical fiber coupling at a wavelength of 1550 nm with a 3 dB bandwidth of 40 nm using an aluminum reflector mirror between the LN and SiO 2 interface. This coupler is the first step towards the demonstration of high-performance integrated photonic devices, which would simultaneously benefit from the acousto-optic properties of As 2 S 3 and electro-optic and acoustic properties of LN. This hybrid platform is deemed to impact a broad range of applications such as imaging, ranging, and inertial sensing.