Single-photon sources with a high extraction efficiency are a prerequisite for applications in quantum communication and quantum computation schemes. One promising approach is the fabrication of a quantum dot containing membrane structure in combination with a solid immersion lens and a metal mirror. We have fabricated an 80 nm thin semiconductor membrane with incorporated InP quantum dots in an AlGaInP double hetero barrier via complete substrate removal. In addition, a gold layer was deposited on one side of the membrane acting as a mirror. The optical characterization shows in detail that the unique properties of the quantum dots are preserved in the membrane structure.
Publication: Fabrication and optical characterization of large scale membrane containing InP/ AlGaInP quantum dots
H Niederbracht, F Hargart, M Schwartz, E Koroknay, C A Kessler, M Jetter and P Michler 
Nanotechnology 26 (2015) 235201
Contact person: Dr. M. Jetter