We investigated the near-field enhancement of a localized surface plasmon resonance
(LSPR) structure based on gold nanograting pairs with a nanosized gap. The results
calculated by finite-difference time-domain and rigorous coupled-wave analysis methods
presented that the nanogap enclosed by two neighboring nanogratings produced significant
confinement and enhancement of electromagnetic fields and allowed a sensitive detection
in sensing of surface binding events. Gold gratings with a narrow gap distance less than 10 …

Interest in biosensing devices has grown enormously over the past decade, with
applications being found in such disparate areas as point-of-care clinical diagnosis,
environmental protection, and food safety [ 1]. Progress in this field has been made with an
aim of realizing high sensitivity, miniaturization, and multichannel and real-time detection.
Among a wide variety of sensing approaches, optical biosensor has secured a very
important place due to its rapid, noninvasive, and real-time monitoring capability [ 2]. More …