Otto Muskens: Materials, design and nanofabrication of devices for controlling the flow of light from visible to far infrared range
Materials, design and nanofabrication of devices for controlling the flow of light from visible to far infrared range
Otto Muskens, Integrated Nanophotonics group, University of Southampton
Nanophotonics brings together a range of fields with the general aim of managing the flow of light using a combination of (i) advanced materials, (ii) state-of-the-art nanofabrication, (iii) sophisticated designs, and (iv) detailed optical studies. In recent years, our group has worked on all of these aspects in a variety of projects and I will provide a few examples of directions of research.
(i) Using state of the art cleanroom facilities in our University, we have developed new materials for volatile (transient) and non-volatile (permanent) optical switching, and transparent conducting oxides for infrared plasmonics and metasurfaces. Infrared applications include radiative cooling of satellites and spacecraft. Switchable and reconfigurable materials find applications in integrated photonic waveguides for telecoms and we have recently shown new routes for programming of functions on a chip for use in programmable photonic devices and AI chips.
(ii) The value of new materials and designs is complemented by capabilities for producing high-quality devices. We have developed capabilities of producing devices at 8-inch wafer scale using a variety of tools including atomic layer deposition, e-beam and deep-UV scanner lithography.
(iii) In order to design devices with particular functionalities, recently developments have been made in using methods from neural networks and deep learning (DL) applied to nanophotonics. In our group, we have applied DL to a variety of challenges in nanophotonics, ranging from fast prediction of nano-optical fields around structures, to design of complex multiple scattering for programmable photonic devices. DL inverse design is complementary to other techniques such as heuristic or adjoint methods.
(iv) Our nanophotonics laboratory consists of home-built equipment for a range of optical microscopy and ultrafast experiments. This set of equipment allows broadband spectroscopy from visible to far-infrared range, spectroscopy of silicon photonic waveguides and laser writing of non-volatile phase change materials on integrated optical circuits.
This colloquium will be hosted by Magnus Borgström.