Optically pumped rolled-up InAs/InGaAsP quantum dash lasers at room temperature

Abstract

We have investigated the fabrication and optical performance of free-standing rolled-up InGaAsP tube optical cavities, wherein self-organized InAs quantum dots or dashes are incorporated as the gain media. Such tubular optical cavities are formed when the coherently strained InAs/InGaAsP quantum dot/dash nanomembrane is selectively released from the host substrate. We have achieved lasing from rolled-up InAs/InGaAsP quantum dash microtubes at room temperature under continuous wave optical pumping. The measured threshold is ∼6 μW, and the Purcell factor and the spontaneous emission coupling factor are estimated to be ∼6.54 and ∼0.87, respectively.

Effect of quantum dot size and size distribution on the intersublevel transitions and absorption coefficients of III-V semiconductor quantum dot

“…There is also recent interest in quantum dash or elongated quantum dot 28,29 structures which have longer dimensions (than the QDs) in the range of $100 nm. The curve corresponding to c x ð¼ 5 100 Þ in Figure 4 shows the absorption coefficient for such structures.…”

Nanomembrane-assembled nanophotonics and optoelectronics: from materials to applications

“…Because of the lattice constant mismatch between III-V compounds/Ge and Si substrate, tensile strain in these material layers also decreases the bandgap energy to extend the light response range by lowering the conductionband edge and raising the valence-band maximum [44,45]. In addition, quantum wells (QWs)/ quantum dots (QDs) are also embedded in standard III-V semiconductor nanomembranes to enhance the light absorption as gain media, which can take advantage in photodetection and lasing [11,46,47].…”

“…Evaporation and sputtering are the most widely used PVD process, by which the composition of nanomembrane is mainly determined by targets. Due to the less limitation of target materials, various nanomembranes of semiconductor [70] and metal [47] materials deposited by PVD can be obtained. CVD is also widely used for coating layers and nanomembrane of various materials because of their affordable cost and controllable precursor [71,72].…”

“…As mentioned in the above section, rolled-up microtubular nanomembranes take the advantage of enhancing light-matter interaction, providing a potential probability for lasing [194]. Due to the unique geometric structures, the lasers based on rolled-up microtubular structures are expected to possess good controllability on polarization and emission direction [47].…”

Thermally controlled coupling of a rolled-up microtube integrated with a waveguide on a silicon electronic-photonic integrated circuit

“…With embedded active media such as quantum wells and quantum dots/dashes, microtubes can function as on-chip lasers [6][7][8][9]. Other microtube-based devices, such as photo-transceivers [10], directional couplers [11], and add-drop filters [12] have also been recently realized.…”