Light-induced torque at multipolar plasmon resonance
Author(s)Lee, Yoon Kyung (Yoon Kyung Eunnie)
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Nicholas X. Fang.
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Light-matter interaction provides a powerful means to control mechanical excitation in the nanoscale. The efficiency of this interaction reaches maximum at optical resonance. By understanding and designing the electromagnetic resonance of nanostructures, we can manipulate the electromagnetic field distribution as desired, with the benefits of enhancing the field strength and squeezing the field spot to be tighter than the diffraction limit. This thesis focuses on the enhanced mechanical effects arising at multipolar plasmon resonance of a subwavelength plasmonic resonator. We perform Finite Difference Time Domain (FDTD) simulation and show that the discrete rotational symmetry of the resonator determines the possible output modes in angular momentum conversion at non-dipolar plasmon resonance. Next, we analyze the efficiency of this conversion for a single, subwavelength nanoparticle in free space. Finally, we calculate the mechanical effects and report that scattering-induced transfer of torque can be unusually enhanced at non-dipolar resonance due to the effects of angular momentum conversion.
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.Cataloged from PDF version of thesis.Includes bibliographical references (pages 89-93).
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering.
Massachusetts Institute of Technology