Abstract
We investigate the role of one subwavelength-size grating of silver as a reflector at different angular positions of InAs-based subwavelength grating (SWG) and non-SWG microring resonators for the application of a femtosecond time delayer. The usage of one silver grate as a reflector basically imposes high loss to the generated peaks of transmitting power in each port of the microrings, but regardless of the amount of the loss, the responses of the SWG and non-SWG microrings are compared, respectively. The achieved results explicitly indicated the different delay lengths between measured peaks at the ports of the microrings as a function of the angular position of one silver grate. Furthermore, the dominant property of the SWG microring to govern the delay length is evident from the observed results.
© 2016 Optical Society of America
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