Plasmonic Tweezers
Plasmonic Tweezers - Related Videos
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A protocol for the colloidal synthesis of silver nanocubes and fabrication of plasmonic nanoscale patch antennas with sub-10 nm gaps is presented.
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Surface Plasmon Resonance (SPR)
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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...
09:29
Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Plasmonic tweezers and photonic crystal nanostructures are shown to produce useful enhancements in the efficiency and orientation control of optically trapping micro- and nano-particles.
10:54
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07:24
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FAQs
Localized surface plasmon resonance concentrates the electromagnetic field around the illuminated metallic nanostructure. This produces intense near fields whose strength changes sharply over short distances, generating steep optical-force gradients. Nearby nanoscale objects therefore experience attraction toward engineered hotspots, allowing their position to be controlled with greater spatial precision than a broadly distributed optical field.
The key advantage is force concentration at the nanoscale rather than simply increasing incident illumination. Because the metallic structure creates steep gradients in the local field, plasmonic tweezers can manipulate small objects at relatively low incident powers. This extends optical manipulation into size and power regimes where conventional optical tweezers are limited.
Gold and silver nanostructures provide the metallic surfaces where illumination produces localized surface plasmon resonance. Their designed hotspots determine where electromagnetic energy and optical-force gradients become concentrated. By positioning target objects near these regions, researchers can control nanoscale particles and biological components with high spatial precision, rather than relying on an undifferentiated trapping field.
A typical approach brings the nanoscale target into the near field of an illuminated metallic nanostructure, where optical forces draw it toward a hotspot. Researchers can then position or control the object while combining the trapping platform with microfluidics or spectroscopy. This arrangement supports controlled manipulation alongside measurement or transport in compact bioengineering systems.
In bioengineering, the approach can position nanoparticles, proteins, DNA, and cellular components. These targets represent different scales and biological roles, so the same platform can support both material handling and biomolecular investigation. Precise positioning is particularly useful when researchers need to bring individual objects together, isolate them, or examine their behavior under controlled optical forces.
Integration with microfluidics and spectroscopy expands the platform beyond trapping alone. Microfluidic systems provide a setting for handling targets, while spectroscopy can accompany manipulation and single-particle analysis. Together, these capabilities support lab-on-a-chip devices, biomolecular assembly, and experiments that connect nanoscale positioning with chemical or biological measurements.
Plasmonic tweezers can support studies of force-dependent biological processes by applying controlled optical forces to nanoscale biological objects. Positioning proteins, DNA, or cellular components near engineered hotspots allows researchers to examine behavior while manipulating location and interaction conditions. The resulting experiments can connect nanoscale forces with biomolecular assembly and other biological responses.