Low power optical bistability from quantum dots in a nanobeam photonic crystal cavity

We demonstrate a low power thermally induced optical bistability at telecom wavelengths and room temperature using nanobeam photonic crystal cavity embedded with an ensemble of quantum dots. The is transfer-printed onto the edge carrier chip for thermal isolation efficient coupling between waveguide setup. Reflectivity measurements performed tunable laser reveal thermo-optic nature nonlinearity. A threshold as 23 μW on/off response contrast 6.02 dB are achieved from moderately quality factor 2830. Our device provides levels order magnitude lower than previous quantum-dot-based devices.