  We demonstrate Anderson localisation of visible light on a chip and report
quality factors exceeding highly engineered two-dimensional cavities. Our
results reverse the trend, observed so far, of the quality of disorder-induced
light confinement being orders of magnitude lower than engineered devices.
Furthermore, by implementing a sensitive imaging technique, we directly
visualise the localised modes, determine their position on the device and
measure their spatial extension. Our findings prove the potential of
disorder-induced localised light for scalable, room temperature, optical
devices, operating in the visible range of wavelengths.
