Bright Single Photon Emission from Quantum Dots Embedded in a Broadband Planar Optical Antenna
Sprache des Titels:
Photonic structures capable of enhancing the light?outcoupling efficiency of embedded epitaxial quantum dots (QDs) in a broad spectral range are attractive for the realization of bright sources of single photons and entangled photon pairs. In this work, a planar?multilayer antenna is experimentally demonstrated for GaAs QDs embedded in AlGaAs membranes. The antenna consists of a metal (Au or Ag) reflector and a semi?transparent metal (Ag) director, with a thin oxide layer (hafnium dioxide (HfO2) or aluminium oxide (Al2O3)) between metal and semiconductor layers. Simulations using the 3D finite?difference time?domain (FDTD) method indicate a maximal efficiency of 43% (for collection optics with a numerical aperture (NA) of 0.85), a wavelength?dependent Purcell factor ranging from ?0.7 to ?1.45, strong directional emission characteristics, as well as a broad bandwidth of ?30 nm. In the experiment, we find a Purcell factor compatible with the simulation results, a maximum collection efficiency as high as ?19% and an ultralow multiphoton emission probability of 0.006 ± 0.005. The planar geometry, its compatibility with post?growth tuning methods, facile fabrication, broad spectral bandwidth, and achieved performance make the presented structure competitive for solid?state sources of quantum light.