title: Surface-enhanced infrared absorption using individual cross antennas tailored to chemical moieties.
abstract: The development of antenna structures for surface-enhanced infrared absorption spectroscopy (SEIRA) is a topic of intense and growing interest for extending IR spectroscopy to zeptomolar quantities and ultimately to the single-molecule level. Here we show that strong infrared spectroscopic enhancements can be obtained from individual gold nanoantennas using conventional IR spectrometric sources. The antenna structure dimensions can be tuned to enhance the IR modes of specific chemical moieties. Simulations of the electric field intensity in the antenna junction region reveal a maximum SEIRA enhancement factor of more than 12,000. These findings open new opportunities for analyzing IR vibrations of exceptionally small quantities of molecules using widely accessible light sources.
authors: Department of Chemistry, Rice University, Houston, Texas 77005, United States.
authors: Lisa V
authors: LV
authors: Brown
authors: Ke
authors: K
authors: Zhao
authors: Nicholas
authors: N
authors: King
authors: Heidar
authors: H
authors: Sobhani
authors: Peter
authors: P
authors: Nordlander
authors: Naomi J
authors: NJ
authors: Halas
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013499:Surface Properties
chemical_list: D006046:Gold