Plasmonic Grating
Plasmonic Grating - Related Videos
08:48
Writing Bragg Gratings in Multicore Fibers
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Cited by 3 •
2016
We describe a technique for inscribing identical fiber Bragg gratings into each core of a multicore fiber. This is achieved by introducing an additional surface into the optical path to mitigate lensing by the curved surface of the fiber cladding.
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.
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Cited by 10 •
2016
The measurement protocol and data analysis procedure are given for obtaining transverse coherence of a synchrotron radiation X-ray source along four directions simultaneously using a single 2-D checkerboard phase grating. This simple technique can be applied for complete transverse coherence characterization of X-ray sources and X-ray optics.
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
The grating period supplies an additional momentum component that incident light lacks when it interacts with a surface plasmon polariton. When the resulting momentum matches the plasmon mode, coupling becomes possible at the metal-dielectric interface. Changing the periodic spacing therefore changes the matching condition, allowing the structure to select or tune the optical response.
Resonance is controlled by both wavelength and incidence angle because these variables change the momentum available to the incoming light. A plasmonic grating can consequently show different diffraction, transmission, or reflection behavior under different illumination conditions. This dependence is useful when tuning an optical component or interpreting measurements from a grating-based experiment.
Coupling can concentrate electromagnetic energy into enhanced near fields close to the metal-dielectric interface. Those localized fields make the optical response sensitive to changes occurring at the surface, while the resonance position provides a measurable indicator. In refractive-index sensing, a change near the interface can shift the plasmon resonance, linking a nanoscale surface event to an optical measurement.
A conceptual workflow begins by selecting the periodic metallic geometry and its surrounding dielectric environment, then examining how incident light couples to the available plasmon mode. The resulting wavelength-, angle-, diffraction-, transmission-, or reflection-dependent response is compared as conditions change. This approach connects structural design with the specific optical behavior required for a nanophotonic device.
Researchers apply plasmonic gratings to compact optical components, spectroscopy, and refractive-index sensing. In spectroscopy, the grating's resonant optical response can support analysis of light-matter interactions; in sensing, resonance shifts report changes at the surface. Their tunability also makes these structures relevant to imaging and other nanophotonic systems where controlling light in a small platform is important.
Within physics, the key outcome is controlled interaction between light and a surface-bound electromagnetic mode. The grating links free-space illumination to a mode confined at a metal-dielectric interface, while its periodicity governs momentum matching. Studying this relationship helps connect diffraction, resonant transmission and reflection, near-field enhancement, and light-matter interaction in nanostructured optical systems.