title: Enhanced extraordinary optical transmission (EOT) through arrays of bridged nanohole pairs and their sensing applications.
abstract: Extraordinary optical transmission (EOT) through arrays of gold nanoholes was studied with light across the visible to the near-infrared spectrum. The EOT effect was found to be improved by bridging pairs of nanoholes due to the concentration of the electromagnetic field in the slit between the holes. The geometrical shape and separation of the holes in these pairs of nanoholes affected the intensity of the transmission and the wavelength of resonance. Changing the geometrical shapes of these nanohole pairs from triangles to circles to squares leads to increased transmission intensity as well as red-shifting resonance wavelengths. The performance of bridged nanohole pairs as a plasmonic sensor was investigated. The bridged nanohole pairs were able to distinguish methanol, olive oil and microscope immersion oil for the different surface plasmon resonance in transmission spectra. Numerical simulation results were in agreement with experimental observations.
authors.affiliation: Advanced Nanofabrication Core Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia. xixiang.zhang@kaust.edu.sa.
authors.forename: Weisheng
authors.initials: W
authors.lastname: Yue
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Wang
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Jingqi
authors.initials: J
authors.lastname: Li
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Longqing
authors.initials: L
authors.lastname: Chen
authors.forename: Boon
authors.initials: B
authors.lastname: Ooi
authors.forename: Xianbin
authors.initials: X
authors.lastname: Wang
authors.forename: Xi-xiang
authors.initials: XX
authors.lastname: Zhang