title: Bloch-mode extraction from near-field data in periodic waveguides.
abstract: We demonstrate that the spatial profiles of both propagating and evanescent Bloch modes in a periodic structure can be extracted from a single measurement of an electric field at the specified optical wavelength. We develop a systematic extraction procedure by extending the concepts of high-resolution spectral methods previously developed for temporal data series to take into account the symmetry properties of Bloch modes simultaneously at all spatial locations. We illustrate the application of our method to a photonic crystal waveguide interface and confirm its robustness in the presence of noise.
authors.affiliation: Centre for Ultra-high Bandwidth Devices for Optical Systems (CUDOS), Nonlinear Physics Centre, Research Schoolof Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
authors.forename: Sangwoo
authors.initials: S
authors.lastname: Ha
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Sukhorukov
authors.forename: Kokou B
authors.initials: KB
authors.lastname: Dossou
authors.forename: Lindsay C
authors.initials: LC
authors.lastname: Botten
authors.forename: C Martijn
authors.initials: CM
authors.lastname: de Sterke
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar