Abstract
The preparation of single-and entangled photon pairs (EPPs) is a critical component in the field of quantum information networks. Quantum Dots (QDs)
embedded in micro-cavities are a promising realization of such non-classical light However, in most implementations of coupled QD-cavities, the spontaneous emission is only enhanced within a small bandwidth, which compromises the efficient extraction of photon pairs. Here, we discuss the fabrication and functionality of a photonic Bier-Glas cavity. By design, this device architecture combines the Purcell enhancement of a photonic micropillar structure with broadband photonic mode shaping of a vertical, tapered waveguide [1]: The low Q-factor microcavity supports broadband optical resonances, and therefore has the potential to can support the efficient extraction of entangled photon pairs. The cavity, which is characterized by a small mode volume, also promises significant spontaneous emission enhancement of the quantum dots due to the Purcell effect. The combination of the tapered waveguide puts extraction efficiencies larger than ε = 0,70 within reach. Our device is based on a MBE grown GaAs/AlGaAs heterostructure containing a low density layer of InAs QDs grown with the partial capping and annealing technique. Careful optimization of the subsequent reactive ion etching step allows us to implement its characteristic Bier-Glas shape. Initial optical characterization verifies the presence of optical resonances, as well as pronounced, bright QD emission signals.
embedded in micro-cavities are a promising realization of such non-classical light However, in most implementations of coupled QD-cavities, the spontaneous emission is only enhanced within a small bandwidth, which compromises the efficient extraction of photon pairs. Here, we discuss the fabrication and functionality of a photonic Bier-Glas cavity. By design, this device architecture combines the Purcell enhancement of a photonic micropillar structure with broadband photonic mode shaping of a vertical, tapered waveguide [1]: The low Q-factor microcavity supports broadband optical resonances, and therefore has the potential to can support the efficient extraction of entangled photon pairs. The cavity, which is characterized by a small mode volume, also promises significant spontaneous emission enhancement of the quantum dots due to the Purcell effect. The combination of the tapered waveguide puts extraction efficiencies larger than ε = 0,70 within reach. Our device is based on a MBE grown GaAs/AlGaAs heterostructure containing a low density layer of InAs QDs grown with the partial capping and annealing technique. Careful optimization of the subsequent reactive ion etching step allows us to implement its characteristic Bier-Glas shape. Initial optical characterization verifies the presence of optical resonances, as well as pronounced, bright QD emission signals.
| Original language | English |
|---|---|
| Publication date | 2020 |
| Number of pages | 1 |
| Publication status | Published - 2020 |
| Event | 11th International Conference on Quantum Dots - Leonardo Royal Hotel Munich, Munich, Germany Duration: 7 Dec 2020 → 11 Dec 2020 https://www.qd2020.de/ |
Conference
| Conference | 11th International Conference on Quantum Dots |
|---|---|
| Location | Leonardo Royal Hotel Munich |
| Country/Territory | Germany |
| City | Munich |
| Period | 07/12/2020 → 11/12/2020 |
| Internet address |