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 ∼9 μm long polarizer (with the period number N=20), the measured extinction ratio is ∼27 dB and the excess loss is ∼0.5 dB at the central wavelength 1550nm. The bandwidth to achieve an extinction ratio of 20dB is about 60nm (from 1520 to 1580nm). When increasing the period number to N=40, the measured extinction ratio is up to 40dB (which is not as high as the expected theoretical value 65dB due to the limit of the measurement system).
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