title: Fabrication and characterization of flexible and tunable plasmonic nanostructures.
abstract: We present a novel method to fabricate flexible and tunable plasmonic nanostructures based on combination of soft lithography and nanosphere lithography, and perform a comprehensive structural and optical characterization of these structures. Spherical latex particles are uniformly deposited on glass slides and used as molds for polydimethylsiloxane to obtain nanovoid structures. The diameter and depth of the nanostructures are controlled by the size of the latex particles. These surfaces are coated with a thin Ag layer for fabrication of uniform plasmonic nanostructures. Structural characterization of these surfaces is performed by SEM and AFM. Optical properties of these plasmonic nanostructures are evaluated via UV/Vis absorption spectroscopy, dark field microscopy, and surface-enhanced Raman spectroscopy (SERS). Position of the surface plasmon absorption depends on the diameter and depth of the nanostructures. SERS enhancement factor (measured up to 1.4 × 10⁶) is dependent on the plasmon absorption wavelength and laser wavelength used in these experiments.
authors.affiliation: 1] Center for Biophotonics Science and Technology, University of California Davis, Sacramento, CA, 95817, USA [2] Department of Chemistry, Faculty of Arts and Sciences, University of Gaziantep, 27310 Sehitkamil/Gaziantep, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Kahraman
authors.forename: Pallavi
authors.initials: P
authors.lastname: Daggumati
authors.forename: Ozge
authors.initials: O
authors.lastname: Kurtulus
authors.forename: Erkin
authors.initials: E
authors.lastname: Seker
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wachsmann-Hogiu