@article { Zhong:14, title = {Focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces}, journal = {Optics Express}, volume = {22}, number = {15}, year = {2014}, month = {07/2014}, pages = {18224--18231}, publisher = {OSA}, type = {article}, abstract = {We report on the design and characterization of focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces. With implementation of waveguide dispersion engineered subwavelength structures, an ultra-wide 1-dB bandwidth of over 100 nm (largest reported to date) near 1550 nm is experimentally achieved for transverse-electric polarized light. By tapering the subwavelength structures, back reflection is effectively suppressed and grating coupling efficiency is increased to ?4.7 dB. A compact device footprint of 40 Ám x 20 Ám is realized by curving the gratings in a focusing scheme. }, keywords = {Gratings; Subwavelength structures}, URL = {http://www.opticsexpress.org/abstract.cfm?URI=oe-22-15-18224}, author = { Zhong, Qiuhang and Veerasubramanian, Venkat and Wang, Yun and Shi, Wei and Patel, David and Ghosh, Samir and Samani, Alireza and Chrostowski, Lukas and Bojko, Richard and Plant, David V. } }