Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

Abstract

Photoluminescence and time resolved photoluminescence from single metamorphic InAs/GaAs quantum dots (QDs) emitting at 1.3 μm have been measured by means of a novel fibre-based characterization set-up. We demonstrate that the use of a wavelength tunable Fibre Bragg Grating (FBG) filter increases the light collection efficiency by more than one order of magnitude as compared to a conventional grating monochromator. We identified single charged exciton and neutral biexciton transitions on the framework of a random population model. The QD recombination dynamics under pulsed excitation can be understood under the weak quantum confinement potential limit and the interaction between carriers at the Wetting Layer (WL) and QD states. 68.65.La, 78.47.jd, 42.79.Ci, Introduction: PACS:

Photoelectric properties of the metamorphic InAs/InGaAs quantum dot structure at room temperature

“…However, these are fundamental not only for the design and development of devices such as edge-emitting lasers but also of more innovative devices such as single photon sources. Very recently, it has been proposed [11][12][13][14] that InAs/InGaAs metamorphic QD nanostructures can be reliable active materials for the generation of single photons in the 1.3 lm and, potentially, the 1.55 lm range; this could open the way to the development of single photon devices working at telecom wavelengths.…”

All-Optical Fiber Hanbury Brown & Twiss Interferometer to study 1300 nm single photon emission of a metamorphic InAs Quantum Dot

“…The FBG-filtering stage included in our all-optical fiber photon correlator offers the possibility to measure these bunching and antibunching 2D patterns with an alternative set-up, as FBG filtering produce high collection efficiency, and can be tuned with high frequency/wavelength resolution and high stability. We have previously shown that FBG filtering is suitable to scan single QD transitions16. Here we used a broadband FBG in order to match the FBG FWHM with our QD transition linewidths and maximize the photon collection rate, although FBG FWHM can be reduced down to 0.4–3.5 μeV (at 1300 nm)41.…”

“…1 ). The use of the FBG reduces the complexity and cost of the experimental set-up, avoiding the use of monochromators, free-space optics filters, lenses and collimators, and hence increasing the collection efficiency by more than one order of magnitude 16 . The increase in photon collection efficiency translates into an increment of the SNR when light is detected by means of InGaAs APDs, and thus it will allow the identification of single-photon emission with APDs operated in the conventional Geiger mode.…”

Квантовые точки InAs, выращенные в метаморфной матрице In-=SUB=-0.25-=/SUB=-Ga-=SUB=-0.75-=/SUB=-As методом МОС-гидридной эпитаксии

“…Этот подход позволил создать лазеры, излучающие на длине волны 1.55 мкм (третье окно прозрачности кварцевого волокна) и бо-лее [6][7][8]. Метаморфные КТ также были использованы для создания источников одиночных фотонов [9][10]. Кроме того, InAs КТ также весьма перспективны для улучшения характеристик фотопреобразователей раз-личного спектрального диапазона [11,12].…”