Development of high resolution position sensitive UV detector based on highly oriented polycrystalline diamond

UV position-sensitive sensor using a polycrystalline highly-oriented diamond film with a sensitive area of 2 × 4.5 mm2 developed, and a proof-of-concept study was conducted. The charge division method was employed to establish the position when the light hits the sensitive area. A fifth higher harmonic of a Nd:YAG laser with pulse width of 100 ps was used as a light source. The position resolution was 0.25 mm, and there was good position linearity throughout the sensitive area. Considering the possibility of light-spot broadening due to diffraction by the slit, the sensor may have a better resolution than that indicated by the result. But the electric-field strength of some parts of the crystal was insufficient, the response time was relatively slow, approximately 0.5 ms.