Zhiping Zhou and Lu Liu    
 
 
Abstract : Subwavelength gratings are periodical structures with pitches small enough to locally synthesize the re-fractive index of photonic waveguides, which allows di-rect control of optical profile as well as easier fabrication process. Several examples of refractive index engineering by subwavelength grating are presented, such as vertical coupling binary blazed grating coupler, polarization beam splitter, and polarization independent directional coupler, which show better performance when compared to their conventional counterparts.
  
 

 

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