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A very smooth lasing transition in photonic crystal nanocavities with embedded quantum dots is observed and compared to the theory. Decay rate measurements reveal that only a few quantum dots are feeding the cavity.
A microscopic theory for optical properties of self‐assembled quantum‐dot systems is presented. For nitride‐based material systems, the single‐particle states are determined from atomistic tight‐binding (TB) calculations. This includes not only localized quantum‐dot states but also delocalized wetting‐layer states, since both contribute to the optical properties and are coupled via interaction processes...
Photonic crystal nanolasers have attracted great interest both for fundamental research and applications in the past decade. In photonic crystal cavities, the leakage to optical modes is strongly reduced, which increases the spontaneous emission coupling factor, β. This is a crucial parameter for the threshold characteristics of lasers. With increasing β, the well-known step-like threshold behavior...
NanoLEDs and nanolasers are light emitting devices with characteristic length scales comparable to the wavelength of the emitted light. They are expected to operate at significantly lower powers and higher speeds than their conventional counterparts, which makes them interesting candidates for light emitters in ultrahigh speed optical communication. This is mainly due to the Purcell effect, which...
We show that avoided resonance crossings can be used to achieve unidirectional light emission from high-quality modes and explain the scarring phenomenon in optical microcavities. Moreover, we introduce a semiconductor theory based on a many-body Hamiltonian to describe the photon statistics of quantum-dot microcavity lasers.
Central ingredients for a theoretical description of optical gain spectra for self-assembled quantum dots are presented. The importance of a quantum kinetic treatment of carrier-carrier Coulomb interaction and carrier-phonon interaction is discussed.
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