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Structured light in metamaterials I

11:00 Invited talk : Spinning the Light in Meta-world

Jingbo Sun, Mikhail Shalaev, Jinwei Zeng, Natalia Litchinitser

The State University of New York at Buffalo (USA)

Recent developments in the field of metamaterials opened unparalleled opportunities for tailoring and manipulating light beams giving rise to the new branch of modern optics that relies on the synergy between structured light and structured matter. In this talk, we discuss our recent studies of light-matter interactions in rationally designed metamaterials enabling novel linear and nonlinear phenomena as well as potential applications of structured light on the nanoscale, including metamaterials-based, ultra-compact, integrated structured light sources and converters.
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11:20 Invited talk : Geometric Phase and Interface State in One-Dimensional Parity-Time Symmetric Optical Structures

Han Zhao, Liang Feng

The State University of New York at Buffalo (USA)

We investigated the geometric phase accumulated in one-dimensional (1D) parity-time (PT) symmetric optical structures (also called the Zak phase in 1D systems). Similarly to the Hermitian system, the Zak phase remains either 0 or Pi in the PT symmetric phase, while in the PT broken phase it varies continuously regarding the imaginary index modulation, showing different topological properties associated with different PT phases. The Zak phase difference therefore forms a novel interface state between two PT symmetric optical structures.
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11:40 Invited talk : Engineering knotted optical vortices for interaction with structured matter

Mark R. Dennis, Benjamin Bode, Danica Sugic, David Foster, Alexander Taylor

University of Bristol (United Kingdom)

We describe the theoretical and numerical construction of optical beams with knotted optical vortices with shortened aspect ratios. These have potential for interaction with a variety of different types of structured matter, especially in nematic liquid crystals and cold atomic gases.
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12:00 Invited talk : Exploring Chiral Hotspots in Photonic Metamaterials: Chiroptical Response, Harmonic Generation, and Chiral-Selective Emission Control

Wenshan Cai

Georgia Institute of Technology (USA)

Metamaterials can be designed to exhibit extraordinarily strong chiral responses. We present a chiral metamaterial that produces both distinguishable linear and nonlinear features in the visible to near-infrared range. In additional to the gigantic chiral effects in the linear regime, the metamaterial demonstrates a pronounced contrast between second harmonic responses from the two circular polarizations. Linear and nonlinear images probed with circularly polarized lights show strongly defined contrast. The metamaterial is further exploited for chiral-selective two-photon luminescence from quantum emitters.
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12:20 Invited talk : Optical vortices form chiral nanostructures

Takashige Omatsu

Chiba University (Japan)

Chiral nanostructures (chiral metal nanoneedles and the chiral azo-polymeric reliefs) fabrication by irradiation of the optical vortices is presented. These chiral nanostructures will enable us to pioneer a new generation of materials science, such as metamaterials, chiral selective nanoscale imaging systems, and chiral chemical reactors.
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