Linearly polarized single photon antibunching from a site-controlled InGaN quantum dot

Abstract

We report on the observation of linearly polarized single photon antibunching in the excitonic emission from a site-controlled InGaN quantum dot. The measured second order coherence function exhibits a significant dip at zero time difference, corresponding to g(m)(2) (0) = 0: 90 under continuous laser excitation. This relatively high value of g(m)(2) (0) is well understood by a model as the combination of short exciton life time (320 ps), limited experimental timing resolution and the presence of an uncorrelated broadband background emission from the sample. Our result provides the first rigorous evidence of InGaN quantum dot formation on hexagonal GaN pyramids, and it highlights a great potential in these dots as fast polarized single photon emitters if the background emission can be eliminated.<p>Funding Agencies|Carl Trygger Foundation for Scientific Research; Swedish Research Council (VR); Nano-N consortium - Swedish Foundation for Strategic Research (SSF); Knut and Alice Wallenberg Foundation; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; Font-D, at Linkoping University</p

Polarized single photon emission and photon bunching from an InGaN quantum dot on a GaN micropyramid

“…A high relative signal (ρ ≈ 1) is essential for high quality single photon emission, and our results show that ρ is reduced from 0.92 to 0.83, when the temperature is elevated from 12 K to 80 K. However, as already discussed, the value of g (2) m [0] is also affected by the TCSPS instrument time constant τ i and the histogram bin width τ BW in ratio with the characteristic anti-bunching time τ c [10]. The non-vanishing values obtained for g (2) exp ( indeed fully explained by 4 when including the contributions from the non-zero background emission (ρ) and the limited instrumental time resolution (τ i and τ BW ).…”

“…Finally, for non-zero histogram bin width τ BW , the measured value g (2) m [0] at zero time difference is obtained by integrating g (2) m (τ ) symmetrically around zero [10], Here, square brackets are used to distinguish the value g (2) m [0] obtained by integration over a finite bin width from the corresponding value g (2) m (0) for an infinitesimal bin width.…”

“…A simple elongation of the pyramid base gives control of the polarization direction [8,9]. The photon statistics of these pyramidal QDs have recently been shown to exhibit anti-bunching, but an spectrally overlapping background emission of uncorrelated photons will vanish high-performance single photon characteristics of the * tomje@ifm.liu.se emission [10]. Cathodoluminescence measurements have revealed that the broad background emission mainly originates from the bottom edges near the pyramid base [9].…”

Plasma-based processes for planar and 3D surface patterning of functional nanoparticles

“…2c, d). The arrays of pyramids that have been fabricated by Houssaine Machhadani et al were utilized as localized single-photon emitters (Jemsson et al 2014). The efficiency of the device is expected to enhance with the plasmonic Ag NPs positioned on the tip of the pyramids.…”

Single‐photon emission from a further confined InGaN/GaN quantum disc via reverse‐reaction growth

“…However, as the antibunching decay time is measured to be a fast approximate 530 ps (in good agreement with the independently measured emission lifetime of approximately 630 ps shown in the figure inset), we must take into account the instrument response function of the detection system (which was measured using a pulsed femtosecond laser to have a time constant of approximately 200 ps) in order to accurately determine the real value of g (2) (0). [43][44][45] We therefore fitted the data with a convolution of the second-order correlation function Equation 2 and the instrument response function, [43][44][45] from which we are able to finally extract a g (2) (0) value of 0.11 ± 0.13 (shown as a FIGURE 4 Autocorrelation histogram measured at 8 K from the spectrum shown in Figure 3A. The grey curve shows the fitting curve based on the second-order correlation function, revealing that the measured g (2) (0) value is approximately 0.29.…”