Designs for high-efficiency electrically pumped photonic nanowire single-photon sources

Abstract

Abstract:We propose and analyze three electrically-pumped nanowire single-photon source structures, which achieve output efficiencies of more than 80%. These structures are based on a quantum dot embedded in a photonic nanowire with carefully tailored ends and optimized contact electrodes. Contrary to conventional cavity-based sources, this non-resonant approach provides broadband spontaneous emission control and features an improved fabrication tolerance towards surface roughness and imperfections. Using an element-splitting approach, we analyze the various building blocks of the designs with respect to realistic variations of the experimental fabrication parameters. Savona, and A. Imamoğlu, "Explanation of photon correlations in the far-off-resonance optical emission from a quantum-dot-cavity system," Phys. ©2010 Optical Society of America

Linearly Polarized, Single-Mode Spontaneous Emission in a Photonic Nanowire

“…A nanocavity could be defined by the integration of a bottom and a top mirror [27] and a high can be obtained for both QD and QW gain medium. Finally, a trumpetlike tapering of the upper end of the wire provides a directive far-field emission [28] and introduces a large top facet that is also convenient to implement a high reflectivity mirror.…”

The photonic nanowire: an emerging platform for highly efficient single-photon sources for quantum information applications

“…The realization of an on-demand, ultra bright single-photon source represents a first implementation of this approach. Regarding advanced quantum light sources, the circular top facet is very convenient to implement a top electrode, [10], [18] which is desirable to provide an electrical charge injection in the QD, [26] or to tune its fine spectral properties with an electric field. [27] We thus anticipate photonic trumpets will constitute a robust and generic platform for a wide range of solid-state quantum optics applications.…”

“…The combination of a top conical tapering [15] and a metal mirror [16] allows for control of the farfield radiation pattern. This has lead to the proposal of optically [17] and electrically [18] pumped designs with predicted efficiencies of ~ 0.9 and to the experimental demonstration of an optically pumped device fabricated using a top-down approach with a measured efficiency ε of 0.72. [19] Furthermore, for a given dot density, the smaller area of the nanowire QD layer compared to that of the micropillar means that fewer dots are present, and very pure photon emission with a measured g (2) (τ=0) as low as 0.008 [19] has been obtained.…”

Bright single-photon source based on an InAs quantum dot in a silver-embedded nanocone structure

“…[1][2][3] Among these systems, single quantum dots (QDs) are potential candidates owing to their discrete levels, which offer high emission rates, narrow spectral line widths, and wide tunability of emission wavelengths. [4][5][6][7][8][9] Significant progress has been made to achieve efficient single-photon sources. One of the key issues is to enhance photon-extraction efficiency, which is defined as the collection efficiency of photons emitted from a QD into the first lens in an experimental optical setup.…”

“…One of the key issues is to enhance photon-extraction efficiency, which is defined as the collection efficiency of photons emitted from a QD into the first lens in an experimental optical setup. Efficient single-photon emission has been demonstrated from single QDs in distributed Bragg reflector (DBR) microcavities with pillar structures 4,5 and inner lateral confinement, 6 photonic nanowires, 7,8 trumpet structures, 9 horn structures, 10 and so on. Coupling of photon emission from QDs to metallic nanoantennas, 11 confined plasmon modes, 12 as well as photonic waveguides 13 was also proposed.…”