Light-Sharing Interface for dMiCE Detectors Using Sub-Surface Laser Engraving

William C J Hunter, Robert S Miyaoka, Lawrence MacDonald, Wendy McDougald, Thomas K Lewellen

Research output: Contribution to journalArticlepeer-review


We have previously reported on dMiCE, a method of resolving depth or interaction (DOI) in a pair of discrete crystals by encoding light sharing properties as a function of depth in the interface of a crystal-element pair. A challenge for this method is the cost and repeatability of interface treatment for each crystal pair. In this work, we report our preliminary results on using sub-surface laser engraving (SSLE) as a means of forming this depth-dependent interface in a dMiCE detector. A surplus first-generation SSLE system was used to create a partially reflective layer 100-microns thick at the boundary between two halves of a 1.4-by-2.9-by-20 mm3 LYSO crystal. The boundary of these paired crystal elements was positioned between two 3-mm wide Silicon photomultiplier arrays. The responses of these two photodetectors were acquired for an ensemble of 511-keV photons collimated to interact at a fixed depth in just one crystal element. Interaction position was then varied to measure detector response as a function of depth, which was then used to maximum-likelihood positions. Despite use of sub-optimal SSLE processing we found an average DOI resolution of 3.4 mm for front-sided readout and 3.9 mm for back-sided readout while obtaining energy resolutions on the order of 10%. We expect DOI resolution can be improved significantly by optimizing the SSLE process and pattern.

Original languageEnglish
Pages (from-to)27-35
Number of pages9
JournalIEEE Transactions on Nuclear Science
Issue number1
Publication statusPublished - 6 Feb 2015


Dive into the research topics of 'Light-Sharing Interface for dMiCE Detectors Using Sub-Surface Laser Engraving'. Together they form a unique fingerprint.

Cite this