Open AccessHigh extinction‐ratio compact polarisation beam splitter on silicon
Author(s) -
Chen Sitao,
Wu Hao,
Dai Daoxin
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.0683
Subject(s) - extinction ratio , optics , silicon , beam splitter , materials science , extinction (optical mineralogy) , beam (structure) , splitter , physics , optoelectronics , wavelength , laser
A novel polarisation beam splitter (PBS) with a high extinction ratio in a broad band has been proposed and realised by cascading a bent directional coupler and a low‐loss transverse‐magnetic (TM)‐pass polariser based on a subwavelength grating. The realised PBS has a footprint as small as 3 × 22.5 μm, a high extinction ratio (>20 dB) and a low excess loss (∼1 dB) are obtained over a broad band of ∼60 nm for both transverse‐electric and TM polarisations.