An integrated Micromegas UV-photon detector

TL;DR

This paper presents a novel UV-photon detector integrating a Micromegas-like multiplier with a CsI photocathode using InGrid technology, enabling monolithic light-sensitive imaging with high gain and low ion back flow.

Contribution

It introduces a new integrated UV-photon detector combining Micromegas and CMOS-compatible InGrid technology for improved imaging applications.

Findings

Maximum gain of ~6000 achieved in Ar/CH4.

CsI photocathode does not affect device performance.

Ion back flow fraction is 2%.

Abstract

Preliminary results of a photon detector combining a Micromegas like multiplier coated with a UV-sensitive CsI photocathode are described. The multiplier is made in a CMOS compatible InGrid technology, which allows to post-process it directly on the surface of an imaging IC. This method is aimed at building light-sensitive imaging detectors where all elements are monolithically integrated. We show that the CsI photocathode deposited in the InGrid mesh does not alter the device performance. Maximum gains of ~6000 were reached in a single-grid element operated in Ar/CH4, with a 2% Ion Back Flow fraction returning to the photocathode.