title: Improving the performance of gold nanohole array biosensors by controlling the optical collimation conditions.
abstract: An experimental investigation on how the bulk and surface sensitivities of gold nanohole arrays fabricated by interference lithography affect the degree of white light beam collimation is presented. The optical transmission response of nanohole arrays has been recorded by focused and collimated beam transmission spectra. The results show that both the bulk and surface sensitivities for the collimated case are much larger than for the focused case. In particular, the shape of the spectra was dependent on the degree of beam collimation. The results showed that improved sensing performance (around 3.5 times) and higher figure of merit (around 4.4 times) can be obtained by simply adjusting the incident/collection experimental conditions in transmission measurements.
authors.forename: Jacson
authors.initials: J
authors.lastname: Weber de Menezes
authors.forename: Anderson
authors.initials: A
authors.lastname: Thesing
authors.forename: Chiara
authors.initials: C
authors.lastname: Valsecchi
authors.forename: Luis E G
authors.initials: LE
authors.lastname: Armas
authors.forename: Alexandre G
authors.initials: AG
authors.lastname: Brolo
mesh_terms: D015374:Biosensing Techniques; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D007368:Interferometry / Q000295:instrumentation / Q000379:methods; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D049329:Nanostructures; D036103:Nanotechnology / Q000379:methods*; D055096:Optical Devices; D055095:Optics and Photonics; D013053:Spectrophotometry / Q000379:methods; D019809:Streptavidin / Q000737:chemistry; D020349:Surface Plasmon Resonance / Q000379:methods*; D013499:Surface Properties
chemical_list: D006046:Gold; D019809:Streptavidin