Daniel Guberman – Università di Siena /INFN terrà un seminario dal titolo:
“Photo-Trap: A photonic crystal light-trap for a large-area, low-noise SiPM pixel”
Many applications in high energy astrophysics, particle physics or medical imaging demand covering a large detection area with fast photosensors. The use of silicon photomultipliers (SiPMs) in such applications is often limited due to their small sensitive area: they are rarely available in sizes larger than 6 mm x 6 mm. A large number of SiPMs are then needed to cover large detection areas, but cost, noise and complexity of the system scale with the number of SiPMs employed. Photo-Trap provides a low-cost, low-noise solution to build large-area SiPM pixels. Photo-Trap employs a custom-designed 1-D photonic crystal and a wavelength-shifter plastic to optically trap the light until it reaches a SiPM. The pixel collects photons over an area that can be 10-100 times larger than that of commercial SiPMs, with the cost and noise of a single SiPM. I will describe the Photo-Trap idea, the proof-of-concept pixel we plan to build and comment (and hopefully get some feedback) on its expected performance and possible applications.