Abstract
An ultracompact and low-loss TM-pass polarizer on silicon is proposed and demonstrated experimentally with a subwavelength-grating (SWG) waveguide. The SWG waveguide is designed to support Bloch mode for TM polarization so that the incident TM-polarized light goes through the SWG waveguide with very low excess loss. On the other hand, for TE polarization, the SWG waveguide works as a Bragg reflector, and consequently the incident TE-polarized light is reflected. For a fabricated long polarizer (with the period number ), the measured extinction ratio is and the excess loss is at the central wavelength 1550 nm. The bandwidth to achieve an extinction ratio of 20 dB is about 60 nm (from 1520 to 1580 nm). When increasing the period number to , the measured extinction ratio is up to 40 dB (which is not as high as the expected theoretical value 65 dB due to the limit of the measurement system).
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
Bin Ni and Jinbiao Xiao
Opt. Express 26(26) 33942-33955 (2018)
Dong Wook Kim, Moon Hyeok Lee, Yudeuk Kim, and Kyong Hon Kim
Opt. Express 24(19) 21560-21565 (2016)
Miguel Barona-Ruiz, Carlos Pérez-Armenta, Alejandro Ortega-Moñux, Gonzalo Wangüemert-Pérez, íñigo Molina-Fernández, Pavel Cheben, and Robert Halir
Opt. Express 30(21) 38930-38937 (2022)