Absorption of a weak probe in singly charged n-doped quantum dots in the Voigt geometry
We analyze the absorption of a weak probe field in singly charged n-doped quantum dots in the presence of an external magnetic field in the Voigt geometry. The dots are modeled as double lambda systems. A laser field pumps two of the four active transitions while a probe field is applied along the t...
| Autores: | , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/13237 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/13237 |
| Access Level: | acceso abierto |
| Palabra clave: | 537.8 539.2:620.1 530.14 Atomic coherence effects Coherent population trapping Gain without inversion Electromagnetismo Óptica (Física) Óptica geométrica e instrumental 2202 Electromagnetismo 2209.19 Óptica Física 2209.06 Óptica geométrica |
| Sumario: | We analyze the absorption of a weak probe field in singly charged n-doped quantum dots in the presence of an external magnetic field in the Voigt geometry. The dots are modeled as double lambda systems. A laser field pumps two of the four active transitions while a probe field is applied along the two undriven transitions. It is shown that for both on resonance and out of resonance driving gain (without inversion) is obtained at two sidebands of the dressed QDs. We found that the peak value of gain can be maximized by a proper selection of both the external magnetic field and the Rabi frequency of the pump field for out of resonance driving. We also show that the coherent driving in combination with above-band excitation allows one to turn the absorption peaks into gain (with inversion) in the whole spectral range. |
|---|