Chiral meta-atoms rotated by light
Mingkai Liu, David A. Powell, and Ilya V. Shadrivov,
Appl. Phys. Lett. 101, 031105-4 (2012).
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Abstract: We study the opto-mechanical properties of coupled chiral meta-atoms based on a pair of twisted split-ring resonators. By using a simple analytical model in conjunction with the Maxwell stress tensor, we capture insight into the mechanism and find that this structure can be used as a general prototype of subwavelength light-driven actuators over a wide range of frequencies. This coupled structure can provide a strong and tunable torque, and can support different opto-mechanical modes, including uniform rotation, periodically variable rotation and damped oscillations. Our results suggest that chiral meta-atoms are good candidates for creating sub-wavelength motors or wrenches controlled by light.
Keywords: atom optics; chirality; optical resonators
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