metamaterials

Waves Functional Materials - 2019-09-15

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B9 L2 H1 R2322

Wave functional materials are artificial materials that can control wave propagation as wished. In this talk, I will give a brief review of the progress of wave functional materials and reveal the secret behind the engineering of these materials to achieve desired properties.

Light management in non-Hermitian media

Dr. Waqas Ahmed, Electrical Engineering, King Abdullah University of Science and Technology

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KAUST

Structured media provide the momentum compensation for the scattering of waves. It is well-known that nano-scale modulations of the refractive index may lead to a temporal and spatial control over light propagation. Yet, also engineering the gain and loss profile uncovers analogous shaping effects. However, only the interplay between both the refractive index and gain and loss modulations introduces unidirectionality in light management. Thus, non-Hermitian optics has become one of the most fertile grounds in optics. A generalized Hilbert transform allows tailoring the two quadratures of the complex permittivity to design periodic or disordered non-Hermitian media, holding either global or local unidirectionality following arbitrary vector fields to tailor the flow of light. The method allows restricting the permittivity within realistic values rendering it suitable for applications.

Ying Wu awarded Phononics Young Investigator 2017

1 min read ·
Prof. Ying Wu received the 2017 Phononics Young Investigator Award as the Phononics community gathered in Changsha, China, for the 4th International Conference on Phononic Crystal/Metamaterials, Phonon Transport/Coupling, and Topological Phononics, on June 4-9 2017.

Dark materials squeeze green fuel from sunlight

1 min read ·
Metallic nanostructures that slow down light dramatically can triple the efficiency of solar-based hydrogen fuel generation.

Zeguo Chen

Master, Nanjing University 2014 Bachelor, Nanjing University 2011 Research Interests Wave propagation in Metamaterials and Phononic Crystals.

Ying Wu

Professor Wu works on theoretical modeling and numerical simulations of classical wave propagation in complex media, including metamaterials, metasurfaces, topological materials and random systems. She is recognized by effective medium theory, perturbation theory for periodic structures with resonances.

Xiujuan Zhang

Dr. Xiujuan Zhang is an Associate Professor at School of Engineering and Applied Sciences, Department of Materials Science and Engineering, Nanjing University. Her research focuses on acoustic metamaterials and topological physics.

Mohamed D. Farhat

Research Scientist, Waves in Complex Media
Mohamed Farhat is currently a Research Scientist at King Abdullah University of Science and technology (KAUST), Thuwal, Saudi Arabia.