title: Sensitive label-free biosensing using critical modes in aperiodic photonic structures.
abstract: In this paper, we introduce a novel approach for optical sensing based on the excitation of critically localized modes in two-dimensional deterministic aperiodic structures generated by a Rudin-Shapiro (RS) sequence. Based on a rigorous computational analysis, we demonstrate that RS photonic structures provide a large number of resonant modes better suited for sensing applications compared to traditional band-edge and defect-localized modes in periodic photonic structures. Finally, we show that enhanced sensitivity to refractive index variations as low as (delta)n=0.002 in RS structures results from the extended nature of critical modes and can enable the fabrication of novel label-free optical biosensors.
authors: Department of Electrical and Computer Engineering, Boston University, Boston, MA 20036, USA. sboriskina@gmail.com
authors: Svetlana V
authors: SV
authors: Boriskina
authors: Luca
authors: L
authors: Dal Negro
mesh_terms: D001704:Biopolymers / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation*; D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D017785:Photons; D012542:Scattering, Radiation; D013194:Staining and Labeling
chemical_list: D001704:Biopolymers