@article { Wang2015, title = {Apodized Focusing Fully Etched Sub-wavelength Grating Couplers}, journal = {Photonics Journal, IEEE}, year = {2015}, month = {04/2015}, abstract = {We experimentally demonstrate apodized focusing sub-wavelength grating couplers for both the fundamental transverse electric (TE00) mode and the fundamental transverse magnetic (TM00) mode. A measured insertion loss of 3.2 dB with a 1-dB bandwidth of 36 nm has been obtained for the TE00 mode and a measured insertion loss of 3.3 dB with a 1-dB bandwidth of 37 nm has been obtained for the TM00. Back reflections of -24 dB and -21 dB have been obtained for the TE00 and TM00 modes, respectively.}, URL = {http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7097646}, author = {Yun Wang and Han Yun and Zeqin Lu and Richard Bojko and Wei Shi and Xu Wang and Jonas Flueckiger and Fan Zhang and Michael Caverley and Nicolas A. F. Jaeger and Lukas Chrostowski} }