title: Direction-dependent optical modes in nanoscale silicon waveguides.
abstract: We show that in high-index-contrast nanoscale waveguides counter propagating waves can posses distinct spatial near-field profiles. Using transmission-based near-field scanning optical microscopy (TraNSOM), we identify and map the unique near-field intensity distributions of these counter-propagating modes in a single-mode silicon waveguide. Based on this phenomenon, we design and simulate an integrated device 45 µm in length that selectively attenuates reflected light with an insertion loss of -3.6 dB and an extinction of greater than -20 dB.
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Jacob T
authors.initials: JT
authors.lastname: Robinson
authors.forename: Michal
authors.initials: M
authors.lastname: Lipson