Attempts to grow optically coupled Fibonacci-spaced InGaAs/GaAs quantum wells result in surface gratings

B. C. Richards, J. Hendrickson, J. Sweet, G. Khitrova, D. Litvinov, D. Gerthsen, B. Myer, S. Pau, D. Sarid, M. Wegener, E. L. Ivchenko, A. N. Poddubny, H. M. Gibbs

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Abstract

An instability in the growth of nonperiodic InGaAs/GaAs multiple quantum well samples, ordinarily of high-quality when grown with equal periods of order of half the wavelength of light in the material, leads to a dramatic microscopic, self-organized surface grating. This effect was discovered while growing quantum wells with two unequal barrier lengths arranged in a Fibonacci sequence to form an optical quasicrystal. A laser beam incident normal to the surface of the sample is diffracted into a propeller-shaped pattern. The sample surface has a distinctly cloudy appearance when viewed along one crystal axis but is mirror-like when the sample is rotated 90°. The instability results in a five-fold increase in the absorption linewidth of the heavy-hole exciton transition. Atomic force microscopy, transmission electron microscopy, and scanning electron microscopy were used to study the samples.

Original languageEnglish (US)
Pages (from-to)21512-21521
Number of pages10
JournalOptics Express
Volume16
Issue number26
DOIs
StatePublished - Dec 22 2008

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Richards, B. C., Hendrickson, J., Sweet, J., Khitrova, G., Litvinov, D., Gerthsen, D., Myer, B., Pau, S., Sarid, D., Wegener, M., Ivchenko, E. L., Poddubny, A. N., & Gibbs, H. M. (2008). Attempts to grow optically coupled Fibonacci-spaced InGaAs/GaAs quantum wells result in surface gratings. Optics Express, 16(26), 21512-21521. https://doi.org/10.1364/OE.16.021512