Pressure of electromagnetic radiation on very thin conductors
Abstract
Background.. We use the mechanical action of laser radiation in the optical range for levitation, holding and moving of microparticles. We use that fact that the radiation beam presses on the particle, pulls it into a region of high field intensity and holds it there. We use the effect of strong absorption and scattering of microwave radiation by very thin conductors - metal wires, graphite and semiconductor fibers, to overcome difficulties caused by comparable large focal spot of the beam in the microwave range.
Objectives. To provide an analysis of the possibility of levitation and control of the movement of thin metal targets, which can be metal conductors with a diameter of several micrometers and a length of several millimeters, using microwave radiation without focusing on the target.
Results. We provide a theoretical analysis of the effect of microwave radiation strong pressure on thin conductors. We derive a condition for the maximum of radiation pressure - the relationship between the radiation wavelength, the diameter of wire and its conductivity. Also, we provide results of measurement of forces acting on thin conductors. For such purpose, we have used a torsion bar scales with a wire suspension with a diameter of several micrometers and an optical rotation angle reading. We show the good agreement between the calculation and experimental results.
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References
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