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We report on round quantum dots grown on InP (100) substrate, which emit around 1.55 μm. At 10 K the full width at half maximum is as small as 28 meV, attesting a rather uniform size distribution. The carrier lifetimes are almost the same across the whole photoluminescence band, indicating the good isolation of quantum dots. Continuous-wave lasings are observed at room temperature from laser diodes made of these quantum dots.

In this paper, analytic formulations and their results are presented to extend the receptance method to a clamped–free cylindrical shell with a plate attached in the shell at an arbitrary axial position. Prior to the analysis of the combined system, the analysis of the free vibration for the shell without a plate was performed by the Rayleigh–Ritz method with a beam function. The integration of the beam functions was performed symbolically by Mathematica and was incorporated in a solution program that could be run in a personal computer. After getting the eigensolution of the simply supported circular plate, the frequency equation of the combined system was obtained by considering the continuity condition at the shell/plate joint. The numerical results were compared with the results from ANSYS, as well as a free vibration test, to validate the formulation. The comparison showed that the analytic results agreed with those from ANSYS and the test.