Zero-cell photonic crystal nanocavity laser with quantum dot gain

Abstract

We demonstrate laser oscillation in a hexagonal-lattice photonic crystal nanocavity using an InGaAs quantum dot gain material by optical pumping at 5 K. The cavity comprises a defect created by shifting several air holes in a two-dimensional photonic crystal slab structure without removing any air holes to achieve both small mode volume and a high cavity quality factor. The measured cavity quality factors and estimated mode volume for the nanocavity are ~33,000 and ~0.004 um^3. The laser threshold is compared between the zero-cell and L3-type nanocavity lasers, and the zero-cell nanolasers are found to have small thresholds of about one-third of the L3-type nanolasers. This result suggests that a higher Purcell factor of the zero-cell nanolaser is reflected as a smaller laser threshold.

6 pages, 3 figures

References in corpus (4)

• Quantum nature of a strongly-coupled single quantum dot-cavity system
• Laser oscillation in a strongly coupled single quantum dot-nanocavity system
• Resolution of the mystery of counter-intuitive photon correlations in far off-resonance emission from a quantum dot-cavity system
• Photonic crystal nanocavity laser with a single quantum dot gain