Plasmonic band gap structures for surface-enhanced Raman scattering

Kocabas, Askin
Ertaş, Gülay
Senlik, S. Seckin
Aydinli, Atilla
Surface-enhanced Raman Scattering (SERS) of rhodamine 6G (R6G) adsorbed on biharmonic metallic grating structures was studied. Biharmonic metallic gratings include two different grating components, one acting as a coupler to excite surface plasmon polaritons (SPP), and the other forming a plasmonic band gap for the propagating SPPs. In the vicinity of the band edges, localized surface plasmons are formed. These localized plasmons strongly enhance the scattering efficiency of the Raman signal emitted on the metallic grating surfaces. It was shown that reproducible Raman scattering enhancement factors of over 105 can be achieved by fabricating biharmonic SERS templates using soft nano-imprint technique. We have shown that the SERS activities from these templates are tunable as a function of plasmonic resonance conditions. Similar enhancement factors were also measured for directional emission of photoluminescence. At the wavelengths of the plasmonic absorption peak, directional enhancement by a factor of 30 was deduced for photoluminescence measurements. (c) 2008 Optical Society of America.


Erkoç, Şakir (Springer Science and Business Media LLC, 1991-01-01)
The structural stability and energetics of carbon, silicon, and germanium microclusters containing 3-7 atoms have been investigated by using a recently developed empirical many-body potential energy function (PEF), which comprises two- and three-body atomic interactions. The PEF satisfies both bulk cohesive energy per atom and bulk stability exactly. It has been found that the most stable C3-4 microclusters are linear with D-infinity-h symmetry but C5-7 microclusters are planar with D(nh) symmetry. Silic...
Dispersive optical constants of Tl2InGaSe4 single crystals
Qasrawi, A. F.; Hasanlı, Nızamı (IOP Publishing, 2007-09-01)
The structural and optical properties of Bridgman method grown Tl2InGaSe4 crystals have been investigated by means of room temperature x-ray diffraction, and transmittance and reflectance spectral analysis, respectively. The x-ray diffraction technique has shown that Tl2InGaSe4 is a single phase crystal of a monoclinic unit cell that exhibits the lattice parameters of a = 0.77244 nm, b = 0.64945 nm, c = 0.92205 nm and beta = 95.03 degrees . The optical data have revealed an indirect allowed transition band ...
Tunable surface plasmon resonance on an elastomeric substrate
Olcum, Selim; Kocabas, Askin; Ertaş, Gülay; Atalar, Abdullah; Aydinli, Atilla (The Optical Society, 2009-05-11)
In this study, we demonstrate that periods of metallic gratings on elastomeric substrates can be tuned with external strain and hence are found to control the resonance condition of surface plasmon polaritons. We have excited the plasmon resonance on the elastomeric grating coated with gold and silver. The grating period is increased up to 25% by applying an external mechanical strain. The tunability of the elastomeric substrate provides the opportunity to use such gratings as efficient surface enhanced Ram...
Ground-state properties, vortices, and collective excitations in a two-dimensional Bose-Einstein condensate with gravitylike interatornic attraction
Keleş, Ahmet; Tanatar, B. (American Physical Society (APS), 2008-05-01)
We study the ground-state properties of a Bose-Einstein condensate with short-range repulsion and gravitylike 1 /r interatomic attraction in two-dimensions (2D). Using the variational approach we obtain the ground-state energy and analyze the stability of the condensate for a range of interaction strengths in 2D. We also determine the collective excitations at zero temperature using the time-dependent variational method. We analyze the properties of the Thomas-Fermi-gravity and gravity regimes, and we exami...
Quantum chemical treatment of Li/Li+ doped defected carbon nanocapsules
Pekoez, Rengin; Erkoç, Şakir (Elsevier BV, 2008-06-01)
Structural and electronic properties of and () doped mono-vacancy defected carbon nanocapsule (CNC) systems have been investigated theoretically by performing semi-empirical self-consistent-field (SCF) molecular orbital (MO) and density functional theory (DFT) methods. Semi-empirical SCF MO method at PM3 level has been considered to optimize fully the geometry of the CNCs in their ground states. The total energies of these structures were calculated using B3LYP exchange-correlation functional in DFT metho...
Citation Formats
A. Kocabas, G. Ertaş, S. S. Senlik, and A. Aydinli, “Plasmonic band gap structures for surface-enhanced Raman scattering,” OPTICS EXPRESS, pp. 12469–12477, 2008, Accessed: 00, 2020. [Online]. Available: