Optical Forces and Manipulation of Momentum in Metamaterials and Plasmonics II
14:00 Invited talk : Enhanced optical forces in plasmonic and metamaterial nanostructures
Xiang Zhang (1),Xiaodong Yang (2)
(1)University of California (USA) , (2)Missouri University of Science and Technology (USA) Optical forces generated from the gradient of light field have been extensively employed to realize exciting applications for light-matter interactions, such as optical trapping and transport, optomechanical energy conversion, and sensors. We will discuss our recent progress in achieving significantly enhanced optical forces using several new types of plasmonic and metamaterial nanostructures, including asymmetric plasmonic antennas for Brownian ratchet, giant forces in hybrid plasmonic waveguides and hyperbolic metamaterial slot waveguides, and zero forces in slot waveguides of epsilon-near-zero metamaterials.
14:20 Invited talk : Towards a Precise Measurement of Surface Plasmon Optical Forces by Use of a Calibrated Evanescent Wave
Lulu Liu (1),Alexander Woolf (1),A. Rodriguez (2),Simon Kheifets (1),Federico Capasso (1)
(1)Harvard University (USA) , (2)Princeton University (USA) Tracking the Brownian Motion of a trapped microsphere can enable precise measurement of sub-piconewton surface forces. This technique, however, is severely undermined by the nearby presence of a metal, which distorts optical fields used to trap and track the colloid. In order to make the first precise measurement of the interaction forces between a colloid and a propagating surface plasmon, we introduce a novel metallic antireflection coating and a calibration technique for absolute position particle tracking.
14:40 Invited talk : Optical Force in Plasmonic and Metamaterial Systems
Shubo Wang (1),Kun Ding (1),Jack Ng (2),C. T. Chan (1)
(1)Hong Kong University of Science and Technology (Hong Kong) , (2)Hong Kong Baptist University (Hong Kong) We present analytical formula for the optical force acting on a chiral particle. The behavior of chiral particles is qualitatively different from achiral particles due to chirality dependent terms which couple mechanical linear momentum and optical spin angular momentum. We show that such chirality induced coupling can serve as a mechanism to achieve optical pulling force. In addition, it can induce a sideway force that can laterally push particles with opposite chirality to the opposing side of an interface.
15:00 Invited talk : High Efficiency Metasurface Holography
Thomas Zentgraf (1),Holger Muhlenbernd (1),Guoxing Zheng (2),Mitchell Kenney (2),Guixin Li (3),Shuang Zhang (2)
(1)University of Paderborn (Germany) , (2)University of Birmingham (United Kingdom) , (3)Hong Kong Baptist University (Hong Kong) Plasmonic metasurfaces combine strong light-matter-interaction with high design flexibility and functionality. Here, we demonstrate the potential of ultrathin metasurfaces for use with high efficiency, high resolution holography and beam shaping. The concept is based on a topological phase change of light passing through the metasurfaces. In such a way broadband phase masks with efficiencies surpassing 80 percent in the visible range can be obtained.
15:20 Invited talk : Optical Forces in Plasmonic and Dielectric Metamaterials
Eric Plum, Jun-Yu Ou, Artemios Karvounis, Weiping Wu, Kevin F. MacDonald, Nikolay I. Zheludev
University of Southampton (United Kingdom) We demonstrate that nanoscale deformation of reconfigurable metamaterials with light leads to giant optical nonlinearities in plasmonic and dielectric metamaterials. While effective optical nonlinearities already many orders of magnitude greater than in natural media are experimentally observed in plasmonic nanomechanical structures, modelling suggests that the underlying optical forces can be even larger within dielectric metamaterials, promising phenomena such as optomechanical bistability and strongly directionally asymmetric transmission.
15:40 Invited talk : Nonlinear effects in torsional metamaterials
Australian National University (Australia) Recently, we introduced a new generation of nonlinear metamaterials called magnetoelastic metamaterials. Here we focus on torsional type of magnetoelastic metamaterials, that have extremely strong nonlinearity, and we demonstrate a number of prominent nonlinear effects, including self-oscillations, chaos and spontaneous symmetry breaking.