title: Polarization-Tailored Fano Interference in Plasmonic Crystals: A Mueller Matrix Model of Anisotropic Fano Resonance.
abstract: Fano resonance is observed in a wide range of micro- and nano-optical systems and has been a subject of intensive investigations due to its numerous potential applications. Methods that can control or modulate Fano resonance by tuning some experimentally accessible parameters are highly desirable for realistic applications. Here we present a simple yet elegant approach using the Mueller matrix formalism for controlling the Fano interference effect and engineering the resulting asymmetric spectral line shape in an anisotropic optical system. The approach is founded on a generalized model of anisotropic Fano resonance, which relates the spectral asymmetry to physically meaningful and experimentally accessible parameters of interference, namely, the Fano phase shift and the relative amplitudes of the interfering modes. The differences in these parameters between orthogonal linear polarizations in an anisotropic system are exploited to desirably tune the Fano spectral asymmetry using pre- and postselection of optimized polarization states. The concept is demonstrated on waveguided plasmonic crystals using Mueller matrix-based polarization analysis. The approach enabled tailoring of several exotic regimes of Fano resonance in a single device, including the complete reversal of the spectral asymmetry, and shows potential for applications involving control and manipulation of electromagnetic waves at the nanoscale.
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Subir K
authors.initials: SK
authors.lastname: Ray
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Shubham
authors.identifier: 0000-0002-0727-8879
authors.initials: S
authors.lastname: Chandel
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Ankit K
authors.initials: AK
authors.lastname: Singh
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Abhishek
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Arpita
authors.initials: A
authors.lastname: Mandal
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Subhradeep
authors.initials: S
authors.lastname: Misra
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Partha
authors.initials: P
authors.lastname: Mitra
authors.affiliation: Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246, India.
authors.forename: Nirmalya
authors.initials: N
authors.lastname: Ghosh
keywords: Fano resonance; Mueller matrix; plasmonics; polarization; scattering