Electrically tunable dielectric metasurfaces based on electrochromic perovskites

Displays, based on light-emitting devices, are ubiquitous in our daily life offering visual information, despite their high energy cost and poor colours under sunlight. Devices based on electrochromism provide an alternative approach but are suffering from limited colours.

Perovskites are well-known semiconductors for optoelectronics but have less been explored for electrochromic applications and their high refractive index, suitable for dielectric metasurfaces, has been overlooked for a long time.

In this study, I propose that by introducing perovskites as the electrochromic materials and building metasurfaces based on them, multiple-colour and electrically tunable displays can be achieved.

The proposed perovskite-based metasurface will potentially resolve the long-standing challenge in nano-optics, the absence of tunable metasurfaces in the visible range.

In addition, the optical characterization of electrochromic properties provides an effective approach to understand the ionic-electronic coupling properties in these materials, benefiting associated optoelectronic research.

The study will be carried out as a 3-year research project based on the collaboration between Nanyang Technological University in Singapore and Linkoping University in Sweden.

I believe, the proposed device will be the first electrically tunable visible dielectric metasurface and one of the highest performance electrochromic displays with full colours, holding promise for future commercialization.