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| 2D photonic crystal slab structure with quantum dots |
SEM image of nanocavity and calculated electromagnetic field |
Quantum Dot Laser Using Photonic Crystal Nanocavity
Ultra low threshold lasing was achieved in quantum dots embedded in a photonic crystal nanocavity. Until now, the processing accuracy of compound semiconductors has been lower than that of silicon, and the absorption characteristic had a detrimental effect on the optical confinement of the cavity. We have greatly improved the dry etching process, and designed the structure to suppress the re-absorption effect. As a result, most of the spontaneous emission of the quantum dots couples with the lasing mode, and this leads to ultra low threshold lasing. (Page 43)