Figure 1

(Color online) (a) 3D schematic and profile of the total displacement induced by a pressing force $F$. (b) Calculated band-gap shift $\Delta E_{\text{g}}$ as a function of the azimuthal distance from the pressing position $\left(\Delta \theta =\theta -{\theta }_P\right)$ for a force strength of $100\mu \text{N}$ (open square) and $200\mu \text{N}$ (open circle). The solid lines are guides to the eye. The inset shows the profile of the band-gap shift in the pressing plane $P3$ [cf. (a)] for the pressing angle ${\theta }_P=0$. The positions of QD1 and QD2 correspond to the example discussed in the theory section.Reuse & Permissions

Figure 2

(Color online) The stars in (a), (b), and (c) indicate the same QD-QD-mode resonance. (a) Calculated transition energies of QD1 and QD2 as a function of applied force $F$. The optical mode energy is presented as a dotted line. Open circles indicate QD-QD resonance. (b) Resonant energies as a function of the pressing angle. Initial transition energies and azimuthal positions of QD1 and QD2 are shown as lines. (c) Force $F_R$ required to bring QD1 and QD2 into resonance at the resonant energies shown in (b). (d) Width of resonant energy range [cf. (b)] as a function of the azimuthal and spectral distance of QD1 and QD2. The dotted line marks the area with $\Delta E_{\text{range}}>\Delta E_{\text{modes}}$ (for detailed explanations, see text).Reuse & Permissions

Figure 3

(Color online) (a) Optical microscopy insight into the cryostat: A rolled up microtube resonator with a glass needle used for in situ pressing. (b) and (c) Schematic of the resonator and the glass needle for top- $\left({\theta }_P\approx 0°\right)$ and side- $\left({\theta }_P\approx 90°\right)$ pressing. (d) and (e) Evolution of the PL from a single QD during pressing for ${\theta }_P\approx 0°$ and ${\theta }_P\approx 90°$. The inset shows a cross-sectional schematic of the deformed tube. The triangle indicates the azimuthal position of the QD.Reuse & Permissions

Figure 4

(Color online) (a) Evolution of PL from two QDs during pressing with ${\theta }_P\approx 0°$. As indicated by the arrow, resonance of QD1 and QD2 occurs at 1.3472 eV. (b) PL of a single QD and a resonator mode. The mode (dotted line) is almost independent of the applied pressing force and is crossed two times by the QD line (QD3, dashed line) which reversibly shifts with the applied force.Reuse & Permissions