Highly Collimated and Polarized Light Emitting Metasurface for AR displays

<b>Major technical challenges must be overcome in order for augmented reality (AR) technologies to fulfill its revolutionizing promises. Current solutions for AR displays suffer from very low efficiencies and large form factors, mostly due to the use of grating-based waveguides and polarizing optical elements. Therefore, there is a growing need for nanophotonics designs that can focus light emission at desirable in-coupling locations for maximum throughput and with a high degree of polarization to avoid the use of bulk polarizers.<br/>Here, we present and characterize a directional and polarized light-emitting metasurface based on a generic GaN LED. We engineered arrays of Mie nanoresonators that preferentially couple to one linear polarization and make use of quasi-guided modes to achieve focused emission. We will discuss the underlying theory for optimal metasurface design and emitter placement as well as present photo and electroluminescence angle-resolved data to confirm a major enhancement in directionality, polarization, and overall efficiency as compared to a commercial LED. This work provides a feasible metasurface design tailored to improve μ-LEDs for next-generation display technologies and represents a significant advancement in the field of light emission control. </b>