Figure 1

(Color online) (a) Schematic view of the sample structure. (b) Scanning electronic microscope image of a mesa showing the lateral contact and the top injection wire. Also indicated is the typical size of the optical excitation and/or detection spot. In the inset a magnified image of the mesa edge reveals the multilayer structure with the cavity in the middle. (c) Current-voltage characteristics measured at 10 and $100\mathrm{K}$. The circles indicate the operating conditions used in the experiments described in this Brief Report. (d) Schematic view of the setup for photocurrent measurements: the sample is excited with a tunable laser controlling both the energy and the angle of incidence of the exciting beam while the induced current is detected. (e) Schematic view of the setup for electroluminescence measurements: a current is injected through the sample and the induced emission is monitored for various detection angles.Reuse & Permissions

Figure 2

(Color online) (a) Photocurrent spectra measured for various detection angles. $T=10\mathrm{K}$ and the applied voltage is $V=1.3\mathrm{V}$ at the limit for reverse polarization. (b) Symbols: energy of the photocurrent peaks as a function of the excitation angle. Lines: calculated energy of the uncoupled cavity mode and exciton line and of the upper and lower polariton branches using a Rabi $\text{splitting}=5\mathrm{meV}$ and $\delta =-1\mathrm{meV}$.Reuse & Permissions

Figure 3

(Color) (a) Photocurrent spectrum measured under normal incidence of the exciting laser beam for $V=1.3\mathrm{V}$, and electroluminescence spectrum measured under normal incidence for $I=1\mathrm{mA}$. (b)–(d) Electroluminescence spectra measured as a function of the detection angle for (b) $I=1\mathrm{mA}$ and $T=10\mathrm{K}$, (c) $I=1\mathrm{mA}$ and $T=100$, and (d) $I=70\mathrm{mA}$ and $T=10\mathrm{K}$. In (b) and (c), the dotted lines correspond to the calculated upper and lower polariton branches using $\Omega =5\mathrm{meV}$ and the intensities are in logscale. In (d), the dotted line corresponds to the cavity mode dispersion.Reuse & Permissions