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[(a)–(c)] Characteristic cross-section TEM images of a test sample with SML QD insertion, taken at different regions of the sample. (d) Plan-view TEM image. The arrows in (c) and (d) indicate the diffraction vector. Submonolayer deposition is performed in 0.8 ML InAs cycles. The characteristic feature size is , the QD surface density is .
(Color online) Light-current-voltage characteristics of a aperture SML QD-VCSEL for 20 and .
Measured and fitted small signal modulation response at . The single-mode emission spectrum is shown in the inset.
(Color online) Modulation bandwidth and extracted resonance frequency as a function of the square root of the current above threshold. The modulation current efficiency factor for the aperture device is , and the maximum resonance frequency is .
(Color online) Damping rate vs squared resonance frequency. The maximum intrinsic bandwidth, resulting from a factor of , is .
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