Open AccessSingle-Polarization Waveguiding by Low-Index Strips on the Surface of Chalcogenide Glass Film
Author(s) -
Yanfen Zhai,
Renduo Qi,
Chenzhi Yuan,
Shuai Dong,
Wei Zhang,
Yidong Huang
Publication year - 2016
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2016.2531598
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
In this paper, we propose and demonstrate a simple chalcogenide glass (ChG) waveguide structure, which is composed of a low refractive-index strip on the surface of the planar ChG film. Theoretical analysis shows that it supports single quasi-TE mode transmission at 1.55 μm with high third-order nonlinearity and negligible bending loss if the bending radius is higher than 60 μm. Then, the ChG waveguide is fabricated and measured. For the waveguide sample with a ChG film of 180 nm in thickness, the measured attenuation of the quasi-TE mode is 0.4 dB/cm at 1.55 μm. Meanwhile, the extinction ratio between the two polarization modes in the waveguide sample of 10 mm in length is higher than 25 dB over a region of 80 nm at 1.55 μm. For the waveguide sample with similar length and a smaller ChG film thickness (150 nm), the extinction ratio increases to 35 dB. These results demonstrate its property of low-loss single-polarization transmission. It provides a simple way to realize high-quality ChG waveguides, which have great potential on integrated nonlinear optical devices.