A single‐photon source (SPS) is a light‐emitting diode (LED) with the particular capability of emitting single photons on demand. The photon is the smallest possible light energy, and whereas lasers and traditional LEDs always emit a large number of photons no matter how short an electrical voltage pulse is applied, the SPS takes advantage of the socalled quantum dot technology to limit the number of emitted photons per trigger to one. Our invention is an electrically driven SPS design implementing nanowire technology which allows for a record‐high photon extraction efficiency . The efficiency describes how many photons per trigger reach the target and should be as close to 100 % as possible. Obtaining such a high efficiency is generally a challenge since various loss mechanisms, in particular the light absorption in the metal contacts that are necessary for electrical pumping, result in reduced efficiency. Our SPS design solves this problem by implementing a unique nanowire‐based design in which the influence of the various loss mechanisms is minimized and an efficiency approaching 100 % can be obtained. The design is general and can be adapted to different material systems and emission wavelengths.
|Effective start/end date||01/06/2010 → 30/11/2011|