Quantum dot photonic crystal lasers

Yoshie, Tomoyuki; Shchekin, O.B.; Chen, H.; Deppe, D.G.; Scherer, Axel

doi:10.1049/el:20020650

Cited by 90 publications

(63 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 of Ref. 4, one then concludes that a SQD with such a linewidth should be able to lase provided the Q exceeds 1000, which is clearly the case here. Studies of lasing with an isolated SQD will be highly interesting, and the conditions here are close to those needed.…”

supporting

confidence: 60%

“…However, here there is a single layer of dots compared with five layers in Ref. 4, so the number of contributing QDs is no more than 16 here. In addition, the lattice temperature here is 10-20 K, compared with room temperature; therefore, the QD linewidth should be narrower than their 7 meV.…”

mentioning

confidence: 96%

“…Studies of lasing with an isolated SQD will be highly interesting, and the conditions here are close to those needed. 4 However, SQD lasing is not claimed here, because the threshold behavior is relatively insensitive to detuning and temperature and does not change when a nanocavity is used that exhibits a strong coupling anti-crossing at low power. Most likely the gain, not from a SQD, but from several QDs in the ensemble mostly situated in the outer reaches of the cavity mode field is responsible for the lasing seen FIG.…”

mentioning

confidence: 99%

“…4 Then a two-dimensional triangular photonic-crystal-lattice with three holes missing to form a cavity spacer is fabricated to provide in-plane light confinement. The GaAs-air interfaces on the top and bottom of the 270-nm-thick slab provide vertical confinement by means of total internal reflection, but light with small inplane wave vectors still leaks out of the cavity.…”

mentioning

confidence: 99%

“…4, it was concluded that about 80 QDs contribute to the lasing. The QDs here are identical to those and have the same density in each layer, and both nanocavities have V Х 3 .…”

mentioning

confidence: 99%

See 4 more Smart Citations

Quantum dot photonic-crystal-slab nanocavities: Quality factors and lasing

et al. 2005

Self Cite

View full text Add to dashboard Cite

Emission linewidths of quantum dot photonic-crystal-slab nanocavities are measured as a function of temperature and fabrication parameters with low-power and high-power, cw and pulsed, nonresonant excitation. The cavity linewidth is dominated by the absorption of the ensemble of quantum dots having a density of Х400/ m 2 ; above the absorption edge, the cavity linewidth broadens considerably compared with the empty cavity linewidth. Gain and lasing are seen for high-power pumping; it is estimated that only a small number of quantum dots contributes to the lasing. DOI: 10.1103/PhysRevB.72.193303 PACS number͑s͒: 42.55.Tv, 42.50.Pq, 42.55.Sa Recently the quality factor Q ͓mode energy divided by full width at half maximum ͑FWHM͒ mode energy linewidth͔ of photonic-crystal-slab cavities has been steadily increased by improved fabrication techniques and designs, while the volume V was kept close to a cubic wavelength in the material. This has made possible not only quantum well 1 and quantum dot 2 lasers but also the observation of strong coupling 3 -vacuum Rabi splitting with a single quantum dot ͑SQD͒. The role of the quantum dots ͑QDs͒ in the lasers is to provide gain, so several layers of high density QDs are often used. In contrast, strong coupling, can best be observed with an isolated SQD, suggesting the use of a single layer of low density QDs. However, to see strong coupling one must search to find two accidental coincidences. The QD must be situated close to an intracavity field maximum. This means it must be within the mode area of 0.15 m 2 , where the intracavity field is strong. It must also have a transition frequency close to a cavity mode; our ensemble QD lowest energy transition has a FWHM of 42.5 meV at 20 K, compared with a maximum dot-nanocavity coupling strength of 0.2 meV. For a reasonable probability for both coincidences, high dot densities ͑300-400/ m 2 ͒ have been used so far. This paper addresses two questions: Is the ensemble QD absorption detrimental to the search for strong coupling? And, if the gain is sufficient for lasing, roughly how many QDs contribute?To fabricate a photonic-crystal-slab nanocavity, a sample is grown by molecular beam epitaxy on a ͑001͒ GaAs substrate starting with a GaAs buffer layer: 800 nm Al 0.94 Ga 0.06 As sacrificial layer, 40 nm GaAs, 20 nm Al 0.1 Ga 0.9 As, single layer of self-assembled InAs QDs ͑den-sity of 300-400 m 2 ͒, and on top of the dots 20 nm Al 0.1 Ga 0.9 As and 40 nm GaAs. 4 Then a two-dimensional triangular photonic-crystal-lattice with three holes missing to form a cavity spacer is fabricated to provide in-plane light confinement. The GaAs-air interfaces on the top and bottom of the 270-nm-thick slab provide vertical confinement by means of total internal reflection, but light with small inplane wave vectors still leaks out of the cavity. As shown by Noda's group using Si, vertical confinement is further enhanced by slightly shifting outward the holes at the ends of the spacer; the Q is increased by confining gently. 5 The quantum dots are e...

show abstract

supporting

confidence: 60%

mentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…4, it was concluded that about 80 QDs contribute to the lasing. The QDs here are identical to those and have the same density in each layer, and both nanocavities have V Х 3 .…”

mentioning

confidence: 99%

See 3 more Smart Citations

Quantum dot photonic-crystal-slab nanocavities: Quality factors and lasing

et al. 2005

Self Cite

View full text Add to dashboard Cite

show abstract

Semiconductor Self‐Assembled Quantum Dots: Present Status and Future Trends

Petroff

2011

Advanced Materials

View full text Add to dashboard Cite

Progress in controlling the size, shape, and composition of quantum dots (QDs) as well as their positioning will be crucial to further advances in the fields of quantum information and device applications. The growth of QDs into lattices using controlled positioning of the QD nucleation centers is a possible method. QD positioning is also much needed for further development of QD microcavities and photonic-crystal based devices that are used for quantum information applications. This article discusses the prospects for progress in these fields that may be realized if a better control over the positioning and self-positioning of quantum dots is achieved.

show abstract

Ultrafast photonic crystal lasers

Englund¹,

Altug

Ellis

et al. 2008

Laser & Photonics Reviews

View full text Add to dashboard Cite

We describe recent progress in photonic crystal nanocavity lasers with an emphasis on our recent results on ultrafast pulse generation. These lasers produce pulses on the picosecond scale, corresponding to only hundreds of optical cycles. We describe laser dynamics in optically pumped single cavities and in coupled cavity arrays, at low and room temperature. Such ultrafast, efficient, and compact lasers show great promise for applications in high-speed communications, information processing, and on-chip optical interconnects.

show abstract

Quantum dot photonic crystal lasers

Cited by 90 publications

References 6 publications

Quantum dot photonic-crystal-slab nanocavities: Quality factors and lasing

Quantum dot photonic-crystal-slab nanocavities: Quality factors and lasing

Semiconductor Self‐Assembled Quantum Dots: Present Status and Future Trends

Ultrafast photonic crystal lasers

Contact Info

Product

Resources

About