Three-dimensional wavelength-scale confinement in quantum dot microcavity light-emitting diodes

Zinoni, C.; Alloing, B.; Paranthoën, C.; Fiore, A.
September 2004
Applied Physics Letters;9/20/2004, Vol. 85 Issue 12, p2178
Academic Journal
We introduce a microcavity light-emitting diode (LED) structure that uses submicrometer oxide aperture and a quantum dot active region to achieve strong three-dimensional confinement of both the carrier distribution and the optical field. Light—current curves show optical emission for devices as small as 400 nm in diameter. Spectroscopy on electrically pumped LEDs, with apertures ranging from 2.5 down to 0.7 μm, show several spectral lines corresponding to cavity modes. A strong blueshift of the resonant modes for smaller apertures demonstrates the role of the oxide aperture in confining laterally the optical wave in a volume comparable to (λ/n)³. Due to the high quality factors and low mode volumes, the devices could he good candidates for the demonstration of the Purcell effect under electrical pumping.


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