Pronounced Purcell enhancement of spontaneous emission in CdTe/ZnTe quantum dots embedded in micropillar cavities

Jakubczyk, Tomasz; Pacuski, W.; Smoleński, T.; Golnik, A.; Florian, Matthias; Jahnke, F.; Kruse, C.; Hommel, D.; Kossacki, P.

doi:10.1063/1.4754078

Cited by 23 publications

(18 citation statements)

References 24 publications

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“…The high level of sophistication achievable using inorganic semiconductor processing techniques has allowed micropillar structures to be realized having very high quality (Q) factors, with recent pillar structures demonstrated having Q‐factors in excess of 250 000 . This strong confinement can be used to engineer enhancements in spontaneous emission rates (the Purcell factor), and thus by placing a single quantum emitter in a micropillar, a device can be created that acts as a source of near indistinguishable single photons . For this reason, micropillar structures and devices are now being explored as practical systems for “single‐photons on demand” in quantum‐cryptography technologies .…”

Section: Introductionmentioning

confidence: 99%

Optical‐Mode Structure of Micropillar Microcavities Containing a Fluorescent Conjugated Polymer

et al. 2019

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The light emission from a series of micropillar microcavities containing a fluorescent, red‐emitting conjugated polymer, is explored. Cavities are fabricated by defining two dielectric mirrors either side of a polymer active region. Focused ion‐beam (FIB) lithography is then used to etch pillar structures into the planar cavity having diameters between 1 and 11 µm. The photoluminescence (PL) emission of the cavities is characterized using real‐space tomographic and Fourier‐space imaging techniques, with emission shown to be quantized into a mode‐structure resulting from both vertical and lateral optical confinement within the pillar. The optical‐confinement effects which result in a blue‐shift of the fundamental mode as the pillar diameter is reduced is demonstrated, with a model applied to describe the energy and distribution of the confined optical modes.

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Section: Introductionmentioning

confidence: 99%

Optical‐Mode Structure of Micropillar Microcavities Containing a Fluorescent Conjugated Polymer

et al. 2019

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“…16,30,31 Both single QD lines and cavity modes were successfully identified in such structures, 32,33 and modes with quality factors of up to 3700 were observed. 34 Recently a Purcell enhancement of emission was demonstrated for a QD at resonance with such a micropillar mode.…”

Section: Resultsmentioning

confidence: 95%

Inhibition and Enhancement of the Spontaneous Emission of Quantum Dots in Micropillar Cavities with Radial-Distributed Bragg Reflectors

et al. 2014

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We present a micropillar cavity where nondesired radial emission is inhibited. The photonic confinement in such a structure is improved by implementation of an additional concentric radial-distributed Bragg reflector. Such a reflector increases the reflectivity in all directions perpendicular to the micropillar axis from a typical value of 15-31% to above 98%. An inhibition of the spontaneous emission of off-resonant excitonic states of quantum dots embedded in the microcavity is revealed by time-resolved experiments. It proves a decreased density of photonic states related to unwanted radial leakage of photons out of the micropillar. For on-resonance conditions, we find that the dot emission rate is increased, evidencing the Purcell enhancement of spontaneous emission. The proposed design can increase the efficiency of single-photon sources and bring to micropillar cavities the functionalities based on lengthened decay times.

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“…We have checked that the markers act as a durable protection of the sample against etching with a beam of gallium ions with standard current and acceleration voltage values. It provides a chance for the preparation of mesa structures like, e. g., micropillars, 26 containing the selected QD using of the markers as protection masks, similar to what was done in Ref. 18.…”

Section: 92425mentioning

confidence: 99%

Single-color, in situ photolithography marking of individual CdTe/ZnTe quantum dots containing a single Mn2+ ion

Sawicki

Malinowski

Gałkowski

et al. 2015

Applied Physics Letters

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A simple, single-color method for permanent marking of the position of individual self-assembled semiconductor Quantum Dots (QDs) at cryogenic temperatures is reported. The method combines in situ photolithography with standard micro-photoluminescence spectroscopy. Its utility is proven by a systematic magnetooptical study of a single CdTe/ZnTe QD containing a Mn 2+ ion, where a magnetic field of up to 10 T in two orthogonal, Faraday and Voigt, configurations is applied to the same QD. The presented approach can be applied to a wide range of solid state nanoemitters.PACS numbers: 75.50. Pp, 75.30.Hx, 78.20.Ls, 71.35.Ji Semiconductor quantum dots (QDs) hold great potential for valuable applications in modern optoelectronics.For instance, they act as optically 1,2 or electrically 3 pumped, highly efficient on-demand singlephoton sources for possible applications in, e.g., quantum information processing schemes.4 As demonstrated recently, 5-9 embedding a magnetic dopant (e.g., a Mn or Co ion) in the QD further enhances its potential for device implementations. Thanks to the s,p-d exchange coupling between a magnetic ion and the carriers confined to the QD, an efficient all-optical manipulation 7-9 and readout 5-9 of the ion's spin projection becomes possible, a milestone in the development of the emerging field of solotronics, that is electronics exploiting quantum properties of individual electrons, ions or defects. 9,10Since QDs are typically randomly distributed in a semiconductor matrix, permanent marking of their position is an indispensable prerequisite for fabrication of any kind of functional device, as well as for any systematic research involving QDs. Several approaches have been utilized so far for high accuracy positioning of individual solid-state nano-emitters, such as QDs or luminescent nanocrystals.11-18 The most efficient ones combined either in situ optical lithography with microphotoluminescence (µ-PL) 13 or, offering even higher spatial resolution, in situ electron beam lithography with cathodoluminescence.18 The optical method (Ref. 13) involved two laser beams of different wavelengths (twocolor method ). The first beam served for determination of the position of the selected QD through µ-PL mapping. Its energy was low enough to avoid exposure of a positive photoresist film deposited on the sample surface. The second laser beam, sharing the same optical path as the first one and of energy high enough to expose the photoresist, was switched on once the QD position was determined. As a result, a mark centered above the selected QD was obtained on the sample surface after the photoresist development. The method has proved its extraordinary efficiency for the production of deterministically coupled (In,Ga)As/GaAs QD -microcavity optical mode devices. 13,19,20 The performance of the method is still limited, however, by the necessity of a precise alignment of the two laser beams and of an overlap of their focused spots on the sample surface. In this letter, we present a scalable method for the pho...

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Pronounced Purcell enhancement of spontaneous emission in CdTe/ZnTe quantum dots embedded in micropillar cavities

Cited by 23 publications

References 24 publications

Optical‐Mode Structure of Micropillar Microcavities Containing a Fluorescent Conjugated Polymer

Optical‐Mode Structure of Micropillar Microcavities Containing a Fluorescent Conjugated Polymer

Inhibition and Enhancement of the Spontaneous Emission of Quantum Dots in Micropillar Cavities with Radial-Distributed Bragg Reflectors

Single-color, in situ photolithography marking of individual CdTe/ZnTe quantum dots containing a single Mn2+ ion

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