Abstract

We report on the achievement of strong coherent emission from GaAs-based single-walled spiral microtubes, wherein photons are localized in an ultrathin $\left(\sim \lambda /25\right)$ region embedded with self-organized InGaAs quantum dots. The emission spectra measured at 300 K are characterized by a regular sequence of sharp optical modes with a maximum Q factor of $\sim 2500$ and separation of $\sim 7\text{\hspace{0.17em} meV}$. The three-dimensional confinement of photons is made possible by the epitaxially smooth tube surface as well as an engineered surface geometry, achieved using a single photolithography step. The experimental results are analyzed using an equivalent planar dielectric waveguide model.

© 2009 Optical Society of America

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