Development of a UV-transparent Lens Array for Enlarging the Effective Area of Multichannel SiPMs
Abstract
We developed a UV-transparent lens array that can increase the photon detection efficiency of a silicon photomultiplier (SiPM) array comprising of 64 pixels (3×3 mm2 each) and 0.2-mm gaps. Through the plano-convex spherical lens on each 3.2×3.2 mm2 region, we showed that the loss of photon detection efficiency due to the pixel gaps could be recovered as the incident photons get concentrated on the sensitive regions of the SiPM array. By using a prototype lens array, we achieved approximately 10%-30% relative increase in photon detection efficiency in our target angles of incidence of 30-60 deg.
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