Structured light in metamaterials III
16:40 Invited talk : Controlling Guided Waves in Telecom Waveguides Using One Dimensional Phased Antenna Arrays
Zhaoyi Li, Myoung-Hwan Kim, Nanfang Yu
Columbia University (USA) We theoretically demonstrate a few novel small-footprint and broadband integrated photonic devices based on optical waveguides patterned with phased antenna arrays. These devices include waveguide mode converters, polarization rotators, perfect absorbers, and optical power diode.
17:00 Invited talk : Detection of the extraordinary transverse pressure in optical fields
Konstantin Bliokh (1),A. Y. Bekshaev (2),M. Antognozzi (3),S. Simpson (4),M. R. Dennis (3),R. Harniman (3),J. Senior (3),R. Hayward (3),H. Hoerber (3),F. Nori (1)
(1)Center for Emergent Matter Science - RIKEN (Japan) , (2)I.I. Mechnikov National University (Ukraine) , (3)University of Bristol (United Kingdom) , (4)Institute of Scientific Instruments of the ASCR (Czech Republic) We predict theoretically and measure experimentally extraordinary transverse force, which appears in inhomogeneous optical fields. In contrast to the known radiation-pressure and gradient optical forces, this weak force is orthogonal to both the momentum (wave vector) and intensity gradient in the field. Moreover, this transverse force crucially depends on the spin (circular polarization) of light. We show that the new force can be associated with enigmatic spin momentum introduced by Belinfante in relativistic field theory almost 70 years ago.
17:20 Invited talk : Universal spin-momentum locking of evanescent waves
Todd Mechelen, Zubin Jacob
University of Alberta (Canada) We show the existence of an inherent property of evanescent waves: spin-momentum locking where the direction of momentum fundamentally locks the polarization of the wave. We show that every case of evanescent waves in total internal reflection, surface states and optical fibers/waveguides possesses this intrinsic spin-momentum locking. We trace the ultimate origin of this phenomenon to complex dispersion and causality requirements on evanescent waves.
17:40 Invited talk : Boundary structure shapes the response of metamaterials
University of Technology Sydney (Australia) We review our recent observations and novel results on the role of the structure of a boundary in metamaterials samples, revealing its tremendous importance as compared to conventional materials. With a series of different geometrical examples, we demonstrate that the properties of metamaterials of finite size deviate significantly from the predictions of an effective medium theory. This effect is well pronounced even for a strongly subwavelength structure, and relevant for fairly large metamaterial pieces including over ten thousand elements.