Suppression of background emission for efficient single-photon generation in micropillar cavities

Abstract

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High extraction efficiency source of photon pairs based on a quantum dot embedded in a broadband micropillar cavity

“…The suppression is a result of destructive interference induced for certain ratios of the emitter wavelength and the micropillar lateral size. The existence of this effect was theoretically predicted in [26] for the case of a moderate Q factor micropillar. Our simulations [27] show that the periodic efficiency modulation also occurs in micropillar cavities featuring low Q factor and that the probability of emission via the cavity mode, commonly characterized by β factor [28, 29], can exhibit very high values (shown in Fig.…”

Enhancement of Single‐Photon Purity and Coherence of III‐Nitride Quantum Dot with Polarization‐Controlled Quasi‐Resonant Excitation

“…Furthermore, the single-photon purity can be further improved by exploiting other fabrication techniques, such as nanoscale focus pinspot, [31] metallic masking [29,47] of quantum well emission and mesa-etching. [28,48,49] Moreover, we could attempt to curtail the radiative lifetime of QDs for Fourier-transformlimited emission by integrating QDs with dielectric cavities [50,51] or plasmonic cavities [52,53] for future quantum information technologies.…”

Performance of the nanopost single-photon source: beyond the single-mode model

“…(5c). Instead, Γ B features pronounced peaks exactly at the onset of the guided modes and these peaks lead to dips in β cav and ε g 78 , but with limited effect on F p 17 . These peaks thus consist on the lower diameter side of radiation modes and on the larger diameter side the newly appeared guided mode.…”

“…As the diameter increases, the emission into the fundamental mode decreases due to the decreased confinement and field strength and so does the β factor. Furthermore, more guided modes appear and they appear in pairs where the EH 1,n modes provide a discontinuous increase in the SE rate, quickly peak and then decrease, whereas the SE rate contribution from the HE 1,n+1 modes increase more slowly and then decrease 78 . The emission into radiation modes follows a semi-periodic pattern with peaks and valleys, where the peaks increase in width and decrease in intensity as the diameter increases.…”