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Top view scanning electron microscopy (SEM) images of quantum dash structures with various nominal amounts of InAs material.
Room temperature PR (solid line) and PL (dashed line) spectra for samples with different nominal thicknesses of deposited InAs material (shown at each spectrum), translating into various QDash sizes. The vertical lines indicate the positions of optical transitions.
PR and PL spectra of sample with measured at . The arrow indicates feature connected with WL optical transition, and the vertical dashed line indicates the optical transition in QDash.
Energies of optical transitions taken from Lorentzian line-shape fits of PR spectra as a function of QDash sizes. The open squares indicate ground state transition, the open circles excited state transition, and the solid triangle transition in barrier layer. The dotted lines are guide to the eye.
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