Speaker: Dragomir Neshev, Australian National University

Time: 20:00 pm, November 4, 2022, GMT+8

Venue: iCANX platform https://www.ican-x.com/talks

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Abstract:

Optical metasurfaces are sub-wavelength patterned surfaces that interact strongly with light. The field has been driven by the key advantages of this technology, including the ultimate miniaturization of optical elements, empowering novel functionalities that process hidden modalities of light, and the opportunity to tune their properties on demand. Several exciting applications have been demonstrated over the past years, including high-efficiency metalenses and holograms. However, many exciting new applications require metasurfaces with dynamically reconfigurable and programable functionalities. Such applications include 3D imaging, holographic displays, and light detection and ranging (LIDAR). This talk will overview the recent advances and challenges in reconfiguring optical metasurfaces. I will discuss metasurface tunability by controlling their surrounding environment and constituent elements. In particular, I will present the development of electrically driven thermo-optical metasurfaces to perform fast amplitude modulation. We demonstrate multi-pixel operation with over 70% transmission modulation. I will also discuss liquid crystal-tunable metasurfaces for full-range phase-only modulation. The presented developments aim to advance the field of tunable optical metasurface for real-world applications of active meta-optics.

Biography:

Dragomir Neshev is the Director of the Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems (TMOS) and a Professor in Physics at the Australian National University (ANU). He received a PhD degree from Sofia University, Bulgaria in 1999. Since then, he has worked in the field of optics at several research centres around the world and joined ANU in 2002. He is the recipient of several awards and honours, including a Highly Cited Researcher (Web of Science, 2021), a Queen Elizabeth II Fellowship (ARC, 2010), and a Marie-Curie Individual Fellowship (European Commission, 2001). His activities span over several branches of optics, including periodic photonic structures, singular optics, plasmonics, and optical metasurfaces.

Source: iCANX