title: Formation of colorimetric fingerprints on nano-patterned deterministic aperiodic surfaces.
abstract: Periodic gratings and photonic bandgap structures have been studied for decades in optical technologies. The translational invariance of periodic gratings gives rise to well-known angular and frequency filtering of the incident radiation resulting in well-defined scattered colors in response to broadband illumination. Here, we demonstrate the formation of highly complex structural color patterns, or colorimetric fingerprints, in two-dimensional (2D) deterministic aperiodic gratings using dark field scattering microscopy. The origin of colorimetric fingerprints is explained by rigorous full-wave numerical simulations based on the generalized Mie theory. We show that unlike periodic gratings, aperiodic nanopatterned surfaces feature a broadband frequency response with wide angular intensity distributions governed by the distinctive Fourier properties of the aperiodic structures. Finally, we will discuss a range of potential applications of colorimetric fingerprints for optical sensing and spectroscopy.
authors.affiliation: Department of Electrical and Computer Engineering & Photonic Center, Boston University, 8 St. Mary's St., Boston, MA 02215, USA.
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Boriskina
authors.forename: Sylvanus Y K
authors.initials: SY
authors.lastname: Lee
authors.forename: Jason J
authors.initials: JJ
authors.lastname: Amsden
authors.forename: Fiorenzo G
authors.initials: FG
authors.lastname: Omenetto
authors.forename: Luca
authors.initials: L
authors.lastname: Dal Negro