LED emission enhancement (LEE) using smart metasurfaces

发光二极管（LED）灯泡代表了人工照明市场上一项潜在的颠覆性技术，因为与白炽灯和紧凑型荧光灯（CFL）技术竞争对手相比，它们具有更优越的性能。然而，由于其不完全均匀的频谱和高功率下的效率下降，以及相对较高的初始成本，它们仍然会引起一些不适。

Light-emitting diode (LED) bulbs represent a potentially disruptive technology on the market of artificial lighting, as they possess superior properties compared to their incandescent and compact fluorescent lamp (CFL) technology competitors. However, they still suffer from causing some discomfort due by their imperfectly uniform spectrum and from efficiency decline at high power, in addition to relatively higher initial costs. This project will develop enhancing a universal add-on, cost-effective thin film composed of metamaterials - a metasurface - that will be placed on the top of the LED source to enhance its luminosity. Integrating the luminosity-enhancing metasurfaces with LED lamps form artificial light sources that will solve the main aforementioned issues by enhancing the efficiency of light power extraction, and increasing the radiation directivity of the emitted angular spectrum of the LED light. A multi-fold luminosity enhancement is expected from this technique, which will make LEDs an unbeatable lighting solution for mass markets, with substantial benefits to Canada.