Plasmonic Absorbance
Plasmonic Absorbance - Related Videos
13:37
Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Cited by 1 •
2013
Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.
07:51
Gas Absorber
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Gas absorbers are used to remove contaminants from gas streams. Multiple designs are used to accomplish this objective1. A packed bed column uses gas and liquid streams running counter to each other in a column packed with loose packing materials, such as ceramics, metals, and plastics, or structured packing1. The packed bed uses surface area created by the packing to...
09:12
Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Cited by 14 •
2016
A protocol for the colloidal synthesis of silver nanocubes and fabrication of plasmonic nanoscale patch antennas with sub-10 nm gaps is presented.
06:58
Surface Plasmon Resonance (SPR)
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2023
Surface plasmon resonance (SPR) is the underlying optical phenomenon behind label-free biosensors to evaluate the molecular affinity, kinetics, specificity, and concentration of biomolecules. In SPR, biomolecular interactions occur on a biosensor made of a thin layer of metal on a prism. Real-time interactions of biomolecules can be monitored by measuring the changes of light reflected off the underside of the metal. This video describes the basic concepts of SPR and how it is used to analyze...
10:54
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Cited by 9 •
2013
We describe methods for the design, fabrication, and experimental characterization of plasmonic photoconductive emitters, which offer two orders of magnitude higher terahertz power levels compared to conventional photoconductive emitters.
FAQs
These variables alter the resonance position and intensity because they change how conduction electrons respond to incident light. The surrounding refractive index is especially important at the interface, while composition, size, and shape determine the nanostructure’s optical behavior. Consequently, comparing spectra from differently prepared particles can reveal how nanoscale structure and local chemical surroundings affect the response.
Incident photons couple to collective electron oscillations in a metallic nanoparticle. This coupling concentrates electromagnetic fields near the particle and converts part of the absorbed optical energy into heat. The two effects make these nanostructures useful for studying nearby molecular interactions while also providing an optical route to investigate energy conversion at metal surfaces.
A change in the surrounding refractive index modifies the resonance position or intensity. Adsorption, molecular binding, and reactions near the metal surface can therefore produce measurable spectral changes without requiring direct observation of the molecules themselves. In chemistry, this links an optical signal to interfacial events occurring at or near the nanostructure.
Researchers first measure the optical response of metallic nanostructures in their initial surrounding medium, then observe how the spectrum changes as adsorption, binding, or a reaction occurs nearby. Changes in resonance position or intensity are compared with the chemical conditions. This approach converts time- or condition-dependent optical behavior into evidence about processes at the metal interface.
Colorimetric sensing uses visible spectral changes associated with metallic nanostructures to indicate changes in their chemical environment. Because composition, size, shape, and surrounding refractive index influence resonance behavior, molecular interactions can alter the observed optical response and potentially the perceived color. The method is therefore useful for translating nanoscale interfacial chemistry into an accessible visual signal.
Absorption by metallic nanostructures couples optical excitation to collective electron motion, enhanced electromagnetic fields, and heat generation. These features provide a basis for investigating photocatalysis and other reactions at metal surfaces. In chemistry research, spectral monitoring can help connect optical energy absorption with changes occurring at interfaces, while the nanostructure’s composition and geometry influence the measured response.