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Related Concept Videos

System of Forces and Couples01:16

System of Forces and Couples

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In the analysis of structural systems, it is common to encounter members subjected to various forces and couple moments. Simplifying these systems can make the analysis more manageable and easier to understand. One approach to achieve this simplification is by moving a force to a point O that does not lie on its line of action and adding a couple with a moment equal to the moment of the force about point O.
The principle of transmissibility plays a crucial role in this process. According to...
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Simplification of a Force and Couple System I01:18

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The concept of reducing a system of forces and couple moments to an equivalent system is essential in simplifying the analysis of rigid bodies. This reduction allows for more straightforward computation and understanding of the external effects produced by the system. In particular, systems with an equivalent resultant force and a resultant couple moment having perpendicular lines of action can be further reduced to a single equivalent resultant force acting along a new line of action. There...
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Simplification of a Force and Couple System: II01:23

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In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
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The Electromagnetic Spectrum02:37

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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The Electromagnetic Spectrum01:24

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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Tunable optical pulling force mediated by resonant electromagnetic coupling.

Guangtao Guo, Tianhua Feng, Yi Xu

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    Optical pulling force (OPF) on nanoparticles is tunable in hybrid systems. Near-field coupling enables controlled manipulation, offering new possibilities for optical sorting and transport.

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    Area of Science:

    • Optics
    • Nanotechnology
    • Materials Science

    Background:

    • Optical manipulation typically relies on scattering forces, leading to pushing effects.
    • Optical pulling force (OPF) is a counterintuitive phenomenon defying classical expectations based on momentum conservation.
    • Controlling OPF is crucial for advanced applications in nanotechnology and materials science.

    Purpose of the Study:

    • To investigate the tunable optical pulling force (OPF) on low refractive index nanoparticles (NPs) within a hybrid dimer system.
    • To elucidate the physical mechanism behind OPF, focusing on near-field electromagnetic coupling.
    • To explore the influence of geometrical parameters and illumination conditions (plane wave, Gaussian beam) on OPF.

    Main Methods:

    • Analytical investigation using the coupled dipole approximation method.
    • Numerical simulations employing the finite-difference time-domain (FDTD) method.
    • Evaluation of OPF dependence on system geometry and beam characteristics.

    Main Results:

    • Tunable OPF is demonstrated on low refractive index NPs in a hybrid plasmonic-dielectric dimer system.
    • Near-field electromagnetic coupling between dielectric and plasmonic NPs is identified as the key mechanism.
    • Pure OPF, free from transverse forces, is achieved using a Gaussian beam illumination.

    Conclusions:

    • The study provides a comprehensive understanding of tunable OPF in hybrid nanostructures.
    • Near-field coupling offers a novel pathway for generating and controlling optical forces.
    • The proposed method enhances optical manipulation capabilities for sorting, transport, and trapping of nanoparticles.