MCI seminar: 21 April
Nanophotonics for optoelectronic device applications in novel materials platforms
by Christian Frydendahl, SDU Nano Optics
Metasurfaces for passive and active devices in THz and visible frequencies
by Zhengli Han, SDU Nano Optics
Abstracts
Nanophotonics for optoelectronic device applications in novel materials platforms
Christian Frydendahl
Light’s interaction with matter gives rise to a large variety of useful technological applications, e.g., photovoltaics, photodetectors, lasers, etc. Fundamentally, light and matter’s interaction is driven by excited electronic states in the absorbing/emitting material. This is also what forms the basis of the field of optoelectronics – that a material’s optical properties can be controlled via electronics, and vice versa. A huge variety of 2D materials have emerged since the successful isolation of monolayer graphene in 2004, and they have displayed both remarkable electrical and optical properties. This makes them of great interest to be studied for potential optoelectronic device applications. In the talk I will cover recent results on several optoelectronic devices (chiefly photodetectors) in a variety of 2D material platforms, and how these can be combined with engineered photonic nanostructures to enhance their performance.
Metasurfaces for passive and active devices in THz and visible frequencies
Zhengli Han
Optical metasurfaces are engineered two-dimensional arrays with sub-wavelength periodicity. They allow for complete control of phase, amplitude, and polarization of transmitted/reflected optical fields based on the design of the metasurface. They have been the target of intense study in the past decades due to their immediately apparent practical applications for making smaller, thinner, and cheap mass-produced optical components. They are of particular interest in the THz community due to the lack of many conventional optical components in this domain. In the talk it will be shown how combining multiple metasurface layers together vertically enables new novel interactions, giving rise to for example phase singularities that could have applications in sensing. Another advantage of metasurfaces are how they can greatly simplify fabrication and reduce the number of materials needed to achieve different optical effects, promising potentially more sustainable/recyclable photonics in the future. Recent results will also be shown in the talk on how optical metasurfaces can be combined with MEMS cantilevers to make the basic components of a sustainable high-speed optical display.
Date, time, place & Zoom link
21 April , 1-2 pm, room M402 at campus Sønderborg and online via Zoom
Zoom link: https://syddanskuni.zoom.us/j/63802406697
Host: Horst-Günter Rubahn
To protect the environment, we only provide an online version of the abstract. Should you need to print it, you can contact Sabina Petersen to get a pdf version.