Abstract
The attractive plasmonic force between two metallic walls due to electromagnetic wave in the slit has been studied earlier for parallel plates and normal incidence. In present paper the effects of imperfectly adjusted plates and laser beam are analyzed. The change of force for non-parallel plates is shown to be of the first order in angle when the wedge is oriented along wave propagation and of the second order for the transverse case. Beam inclination decreases the force due to an antisymmetric mode excited in the slit.
Highlights
Since the 1980s, Micro-Electro-Mechanical Systems (MEMS) have rapidly developed and become an essential part of the technology for micro-devises [1,2,3]
The attractive plasmon force between two metallic walls when the electromagnetic wave propagates through a narrow slit has been studied earlier for parallel plates and normal incidence
The change of force for non-parallel plates is shown to be of the first order in inclination angle when the wedge is along wave propagation and of the second order for transverse case
Summary
Since the 1980s, Micro-Electro-Mechanical Systems (MEMS) have rapidly developed and become an essential part of the technology for micro-devises [1,2,3]. The forces, with collective plasmon resonances excited by the laser field, are studied experimentally for the dielectric sphere near a conducting plate [7] and theoretically between two close metallic nanospheres [8]. They are challenging for optical trapping and laser tweezers [9, 10]. In particular case of slit between plane-parallel metallic plates the attractive plasmon force has been predicted [11, 12] with properties determined by the geometry, conductivity, and the light polarization Magnitude of this force for gold walls and normal incidence is of the order of nanonewtons, it becomes an important experimental issue.
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