title: On-chip optical filters with designable characteristics based on an interferometer with embedded silicon photonic structures.
abstract: We demonstrate chip-scale flat-top filters at near-IR wavelengths using negative index photonic crystal based Mach-Zehnder interferometers. Supported by full three-dimensional numerical simulations, we experimentally demonstrate a new approach for engineering high-pass, low-pass, bandpass, and band-reject filters, based on designing the photonic band diagram both within the bandgap frequency region and away from it. We further show that our approach can be used to design filters that have tunable multilevel response for different sections of the spectrum and for different polarizations. This configuration enables deterministic control of the bandwidth and the rejection ratio of filters for integrated photonic circuits.
authors.affiliation: Optical Nanostructures Laboratory, Columbia University, New York, New York 10027, USA. sk2927@columbia.edu
authors.forename: Serdar
authors.initials: S
authors.lastname: Kocaman
authors.forename: Mehmet S
authors.initials: MS
authors.lastname: Aras
authors.forename: Nicolae C
authors.initials: NC
authors.lastname: Panoiu
authors.forename: Ming
authors.initials: M
authors.lastname: Lu
authors.forename: Chee Wei
authors.initials: CW
authors.lastname: Wong