Surface plasmon resonance

About: Surface plasmon resonance is a research topic. Over the lifetime, 24909 publications have been published within this topic receiving 810976 citations. The topic is also known as: Surface plasmon resonance & SPR (technology).

Surface plasmon resonant interference nanolithography technique

Abstract: We demonstrate a promising nanofabrication method, used to fabricate fine patterns beyond the diffraction limit, by employing surface plasmon polariton (SPP) resonance. Sub-100 nm lines were patterned photolithographically using surface plasmon polaritonic interference in the optical near field excited by a wavelength of 436 nm. The unperforated metallic mask approach which has corrugated surfaces on both sides is proposed for arbitrary patterning. The corrugated surface of the metallic mask on the illuminated side collects light through SPP coupling, and SPP on the exit side of metallic mask redistributes the light into nanoscale spatial distribution, which can be used to fabricate nanostructures. Preliminary numerical simulations support the experimental results.

Surface plasmon resonance enhanced light absorption and photothermal therapy in the second near-infrared window.

Abstract: Enhanced near-field at noble metal nanoparticle surfaces due to localized surface plasmon resonance (LSPR) has been researched in fields ranging from biomedical to photoelectrical applications. However, it is rarely explored on nonmetallic nanomaterials discovered in recent years, which can also support LSPR by doping-induced free charge carriers, let alone the investigation of an intricate system involving both. Here we construct a dual plasmonic hybrid nanosystem Au–Cu9S5 with well controlled interfaces to study the coupling effect of LSPR originating from the collective electron and hole oscillations. Cu9S5 LSPR is enhanced by 50% in the presence of Au, and the simulation results confirm the coupling effect and the enhanced local field as well as the optical power absorption on Cu9S5 surface. This enhanced optical absorption cross section, high photothermal transduction efficiency (37%), large light penetration depth at 1064 nm, excellent X-ray attenuation ability, and low cytotoxicity enable Au–Cu9S5 ...

Nanosphere Lithography: Effect of the External Dielectric Medium on the Surface Plasmon Resonance Spectrum of a Periodic Array of Silver Nanoparticles

Abstract: In this paper we examine the effect of solvent on the optical extinction spectrum of periodic arrays of surface-confined silver nanoparticles fabricated by nanosphere lithography (NSL). By use of NSL, it is possible to systematically vary the out-of-plane height of the nanoparticles, and by thermal annealing, we can control the nanoparticle shape. We have studied four separate samples of nanoparticle arrays; three samples have nanoparticles that are truncated tetrahedral in shape but that differ in out-of-plane height and one sample has nanoparticles that are oblate ellipsoidal in shape. By performing UV−vis extinction spectroscopy measurements at 12 μm spatial resolution, we show that the defect sites that occur as a byproduct of the NSL fabrication process play a negligible role in the macroscale extinction spectrum. We find that the extinction spectrum of the nanoparticles that are oblate ellipsoidal in shape is least sensitive to the surrounding dielectric medium, and the extinction spectrum of the na...

Synthesis and Optical Properties of ``Branched'' Gold Nanocrystals

Abstract: We report the synthesis of new “branched” gold nanocrystals in high yield (over 90%) via a wet-chemical route. The branched nanocrystals exhibit a shape-dependent plasmon resonance that is red-shifted by 130−180 nm from the spherical particle wavelength. Discrete dipole approximation (DDA) calculations qualitatively replicate the observed optical extinction spectra of the nanocrystals, indicating that the surface plasmon resonance is mainly determined by in-plane dipole excitation associated with the sharp tips.

Principles of biosensing with an extended coupling matrix and surface plasmon resonance

Abstract: Surface plasmon resonance is one of the surface-oriented biosensing techniques that can be used to monitor biomolecular interactions. It is utilized in instrumentation for real-time biospecific interaction analysis capable of determining not only the concentrations of biomolecules but also kinetic constants, binding specificity, etc. In this contribution biosensing with surface plasmon resonance is reviewed. Special attention is given to an extended interaction matrix on the sensing surface, which enables the covalent binding of, e.g., antigens or antibodies. The surface plasmon resonance angle shifts are calculated as a function of the amount of organic material in the matrix. The influence of physical parameters, such as matrix thickness and wavelength of the light, on the expected performance is considered. Finally, a few illustrative experimental results obtained with a recently introduced commercial instrument are given.