title: Enhanced transmission with tunable Fano-like profile in magnetic nanofluids.
abstract: We observe a Fano-like resonance in a magnetically polarizable nanofluid. Under an external magnetic field, the transmittance spectrum of a ferrofluid emulsion containing droplet size of ~220 nm shows an enhanced peak with a Fano-like profile, which is attributed to a localized waveguide resonance from random array of tubes with charged inner surface that are formed by the alignment of the droplets. Furthermore, by varying the magnetic field, the Fano profile is tuned and an opaque emulsion is turned into a transparent one. This finding may have interesting applications in tunable photonic devices.
authors.affiliation: SMARTS, Metallurgy and Materials Group Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India.
authors.forename: Junaid M
authors.initials: JM
authors.lastname: Laskar
authors.forename: Baldev
authors.initials: B
authors.lastname: Raj
authors.forename: John
authors.initials: J
authors.lastname: Philip