Fig. 4From: Subwavelength silicon photonics for on-chip mode-manipulationa An ultracompact PBS based on an ADC assisted with a TM-type HPWG [88]; b An extremely-small PBS based on an MMI assisted with a TM-type HPWG [89]; c An ultracompact PBS based on an ADC assisted with a TE-type HPWG [90]Back to article page