  The bubble-assisted Liquid Hole-Multiplier (LHM) is a recently-introduced
detection concept for noble-liquid time projection chambers. In this "local
dual-phase" detection element, a gas bubble is supported underneath a
perforated electrode (e.g., Thick Gas Electron Multiplier - THGEM, or Gas
Electron Multiplier - GEM). Electrons drifting through the holes induce large
electroluminescence signals as they pass into the bubble. In this work we
report on recent results of THGEM and GEM electrodes coated with cesium iodide
and immersed in liquid xenon, allowing - for the first time - the detection of
primary VUV scintillation photons in addition to ionization electrons using
LHMs.
