title: Channel add-drop filter based on dual photonic crystal cavities in push-pull mode.
abstract: We demonstrate an add-drop filter based on a dual photonic crystal nanobeam cavity system that emulates the operation of a traveling wave resonator, and, thus, provides separation of the through and drop port transmission from the input port. The device is on a 3×3  mm chip fabricated in an advanced microelectronics silicon-on-insulator complementary metal-oxide semiconductor (SOI CMOS) process (IBM 45 nm SOI) without any foundry process modifications. The filter shows 1 dB of insertion loss in the drop port with a 3 dB bandwidth of 64 GHz, and 16 dB extinction in the through port. To the best of our knowledge, this is the first implementation of a port-separating, add-drop filter based on standing wave cavities coupled to conventional waveguides, and demonstrates a performance that suggests potential for photonic crystal devices within optical immersion lithography-based advanced CMOS electronics-photonics integration.
authors.forename: Christopher V
authors.initials: CV
authors.lastname: Poulton
authors.forename: Xiaoge
authors.initials: X
authors.lastname: Zeng
authors.forename: Mark T
authors.initials: MT
authors.lastname: Wade
authors.forename: Miloš A
authors.initials: MA
authors.lastname: Popović