title: Resonance wavelength-dependent signal of absorptive particles in surface plasmon resonance-based detection.
abstract: We describe the resonance wavelength-dependent signal of absorptive particles in surface plasmon resonance (SPR)-based detection using both modeling and experimental results. The particles, gold nanocages, have a significant absorption cross-section in the nearinfrared (NIR), resulting in a wavelength-dependent refractive index as measured by SPR. The SPR signal due to the nanocages varies by 4-fold over resonance wavelengths from 650 nm to 950 nm. The greatest SPR signal occurs at the longest resonance wavelengths; its magnitude is due to the inherent increase in sensitivity of SPR on gold with increasing wavelength and the optical absorption properties of the nanocages.
authors.affiliation: Department of Bioengineering, University of Washington, Seattle, WA.
authors.forename: Elain
authors.initials: E
authors.lastname: Fu
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Ramsey
authors.forename: Jingyi
authors.initials: J
authors.lastname: Chen
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Chinowsky
authors.forename: Benjamin
authors.initials: B
authors.lastname: Wiley
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
authors.forename: Paul
authors.initials: P
authors.lastname: Yager