We have synthesized nanodots (NDs) on a dielectric using a glancing angle deposition technique. The NDs were 11 to 22 nm in diameter, which was confirmed by atomic force microscopy image. A green light emission (550 nm) was observed from NDs when excited with a xenon lamp of wavelength 322 nm. The emission was redshifted () when the excitation was changed to 325 nm. The NDs-based detector showed a very low leakage current of () and responded to the green light at 550 nm.