Journal
OPTICS EXPRESS
Volume 23, Issue 8, Pages 9968-9978Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.009968
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Funding
- National Science Foundation [CMMI-1120577]
- Defense Threat Reduction Agency [HDTRA110-1-0106, HDTRA1-07-C-0042]
- National Institute of Health [1R01RR026273-01]
- Air Force Office of Scientific Research [FA9550-12-1-0236]
- DARPA PULSE program from AMRDEC [W31P40-13-1-0018]
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We present a polarization rotation and coupling scheme that rotates a TE0 mode in a silicon waveguide and simultaneously couples the rotated mode to a hybrid plasmonic (HP0) waveguide mode. Such a polarization rotation can be realized with a partially etched asymmetric hybrid plasmonic waveguide consisting of a silicon strip waveguide, a thin oxide spacer, and a metal cap made from copper, gold, silver or aluminum. Two implementations, one with and one without the tapering of the metal cap are presented, and different taper shapes (linear and exponential) are also analyzed. The devices have large 3 dB conversion bandwidths (over 200 nm at near infrared) and short length (<5 mu m), and achieve a maximum coupling factor of similar to 78% with a linearly tapered silver metal cap. (C) 2015 Optical Society of America
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