title: Metallic membranes with subwavelength complementary patterns: distinct substrates for surface-enhanced Raman scattering.
abstract: We present a detailed comparison of surface-enhanced Raman spectroscopy (SERS) signals from metallic nanoparticle arrays and their complementary hole arrays. Using an analytical model for local field enhancement, we show that the SERS enhancements of the hole arrays are closely related to their transmission spectra. This trend is experimentally confirmed and characterized by a cos(4 )θ dependence of the SERS signal on the excitation polarization angle θ. The particle arrays, on the other hand, exhibit quite different behavior because of the existence of considerable evanescent modes in the near field. Their maximal local field gains appear at wavelengths generally much larger than their localized surface plasmonic resonant wavelengths.
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Qingzhen
authors.initials: Q
authors.lastname: Hao
authors.forename: Yong
authors.initials: Y
authors.lastname: Zeng
authors.forename: Bala Krishna
authors.initials: BK
authors.lastname: Juluri
authors.forename: Xiande
authors.initials: X
authors.lastname: Wang
authors.forename: Brian
authors.initials: B
authors.lastname: Kiraly
authors.forename: I-Kao
authors.initials: IK
authors.lastname: Chiang
authors.forename: Lasse
authors.initials: L
authors.lastname: Jensen
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Werner
authors.forename: Vincent H
authors.initials: VH
authors.lastname: Crespi
authors.forename: Tony Jun
authors.initials: TJ
authors.lastname: Huang