Fabrication of genuine single-quantum-dot light-emitting diodes

Schmidt, Ralf; Scholz, Uwe; Vitzethum, M.; Fix, R.; Metzner, Claus; Kailuweit, P.; Reuter, D.; Wieck, A. D.; Hübner, Matthias; Stufler, S.; Zrenner, A.; Malzer, S.; Döhler, G. H.

doi:10.1063/1.2188057

Cited by 37 publications

(26 citation statements)

References 14 publications

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“…As mentioned above, the electrical bandwidth appears limited in the present device by trapped charge states which may be reduced by improved material growth and processing [26,27]. The bandwidth is additionally limited by the contact's RC time constant, which, however, could be as low as 10 ps [28]. Meanwhile, the optical bandwidth is limited by the response time of the coupled QD-cavity system.…”

Section: Qd-controlled Cavity Transmissionmentioning

confidence: 91%

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An optical modulator based on a single strongly coupled quantum dot - cavity system in a p-i-n junction

Englund¹,

Faraon²,

Majumdar³

et al. 2009

Opt. Express

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Abstract:We demonstrate an optical modulator based on a single quantum dot strongly coupled to a photonic crystal cavity. A vertical p-i-n junction is used to tune the quantum dot and thereby modulate the cavity transmission, with a measured instrument-limited response time of 13 ns. A modulator based on a single quantum dot promises operation at high bandwidth and low power. 013,904 (2005). 17. Y. Akahane, T. Asano, B.-S. Song, and S. Noda, "High-Q photonic nanocavity in a two-dimensional photonic crystal," Nature 425, 944-947 (2003). 18. M. Toishi, D. Englund, A. Faraon, and J. Vučković, "High-brightness single photon source from a quantum dot in a directional-emission nanocavity," Opt.

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Section: Qd-controlled Cavity Transmissionmentioning

confidence: 91%

“…This power could be reduced very substantially if the p-i-n region were defined at submicron length scale around the quantum dot, which should lower the capacitance below 1 fF [28]. The quantum dot could be shifted through the cavity with a voltage below 100 mV [20].…”

Section: Qd-controlled Cavity Transmissionmentioning

confidence: 99%

An optical modulator based on a single strongly coupled quantum dot - cavity system in a p-i-n junction

Englund¹,

Faraon²,

Majumdar³

et al. 2009

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Emissions from 0D-exciton complexes localized in semiconductor quantum dots (QDs) are one of the most promising candidates for single-photon and/or entangled-photon pair sources [2,3,4,5,6,7,8,9,10,11,12]. Recently, research on semiconductor QD embedded in epitaxially grown nanowire (NW) structures has been a subject of interest in practical nano-scale device applications, such as photon sources, single-electron storage, and quantum logic circuit.…”

Section: Related Contentmentioning

confidence: 99%

Exciton coherence in clean single InP/InAsP/InP nanowire quantum dots emitting in infra-red measured by Fourier spectroscopy

Sasakura

Kumano

Suemune

et al. 2009

J. Phys.: Conf. Ser.

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Abstract. We report optical properties of InP/InAsP/InP nanowire quantum dots and single-photon Fourier spectroscopy of an exciton in a single InAsP quantum dot embedded in an InP nanowire. The coherent length of the time-averaged emission originating from the single InAsP QD was measured by a Mach-Zehnder interferometer inserted in the photoluminescence path. Effects of fluctuations in surrounding excess charges trapped in the InP nanowire were investigated by excitation power and energy dependencies.

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“…For high-speed electrical modulation, the RC time constants of the lasers have to be small enough, where C and R are the capacitance and resistance of the laser. We believe that very fast electrical pumping of nanocavity lasers is possible, as a recent experiment achieved time constants below 10 ps using micron-scale contacts with sub-fF capacitance 27 . In addition, photonic crystal nanocavity lasers do not require highly resistive Bragg mirror layers, which also limit electrical modulation speeds in fast vertical cavity surface-emitting lasers.…”

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confidence: 99%

Ultrafast photonic crystal nanocavity laser

2006

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Spontaneous emission is not inherent to an emitter, but rather depends on its electromagnetic environment. In a microcavity, the spontaneous emission rate can be greatly enhanced compared with that in free space. This T he spontaneous emission (SE) rate in a microcavity is enhanced by the Purcell factor 1 (F), proportional to the ratio of the cavity quality factor (Q) to mode volume (V mode ). Until now, the advantages of large SE rate enhancement have not been fully explored in lasers because of their large mode volumes. Thus, their SE properties have been dictated by the intrinsic radiative lifetime of the bulk material. With the recent advances in semiconductor fabrication and crystal growth, it has become possible to produce high-quality photonic crystals. These are structures of alternating refractive index 2,3 that provide unprecedented control over the electromagnetic environment. Cavities introduced into the photonic crystal can have extremely high Q/V mode ratios, and therefore can enable large Purcell factors. So far, such nanocavities have been used for cavity quantum electrodynamic (QED) experiments 4-12 such as SE rate enhancement 4,5,9-11 and suppression 4 , and also for single-photon sources 4,12 and lower-threshold lasers [13][14][15][16][17] . Here, we demonstrate extremely fast photonic crystal nanocavity lasers with response times below the 2 ps detection limit of our measurement apparatus. The turn-on delay times are measured as near 1 ps, more than an order of magnitude faster than previous measurements 18,19 .There are two important laser modulation schemes: smalland large-signal modulation. We analyse the laser dynamics by solving the laser rate equations 20 for photon and carrier densities. Communication systems use both small-and largesignal modulation [20][21][22] . In the small-signal regime, the laser is driven with an above-threshold d.c. pump power L in,0 and modulated with a small time-varying (a.c.) signal L in . The carrier and photon densities follow the pump with d.c. and a.c. components N 0 + N and P 0 + P, respectively. The modulation response is given by P/ N. At low d.c. driving power above threshold, the bandwidth of the laser is limited by the relaxation oscillation frequency:

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Fabrication of genuine single-quantum-dot light-emitting diodes

Cited by 37 publications

References 14 publications

An optical modulator based on a single strongly coupled quantum dot - cavity system in a p-i-n junction

An optical modulator based on a single strongly coupled quantum dot - cavity system in a p-i-n junction

Exciton coherence in clean single InP/InAsP/InP nanowire quantum dots emitting in infra-red measured by Fourier spectroscopy

Ultrafast photonic crystal nanocavity laser

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