Author: Jark, W.H.
Paper Title Page
TUP097 Fast, Multi-band Photon Detectors based on Quantum Well Devices for Beam-monitoring in New Generation Light Sources 600
 
  • T. Ganbold
    University of Trieste, School of Nanotechnology, Trieste, Italy
  • M. Antonelli, G. Cautero, R. Cucini, D.M. Eichert, W.H. Jark, R.H. Menk
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • G. Biasiol
    IOM-CNR, Trieste, Italy
  
  In order to mon­i­tor the pho­ton-beam po­si­tion for both di­ag­nos­tics and cal­i­bra­tion pur­poses, we have in­ves­ti­gated the pos­si­bil­ity to use In­GaAs/In­AlAs Quan­tum Well (QW) de­vices as po­si­tion-sen­si­tive pho­ton de­tec­tors for Free-Elec­tron Laser (FEL) or Syn­chro­tron Ra­di­a­tion (SR). Owing to their di­rect, low-en­ergy band gap and high elec­tron mo­bil­ity, such QW de­vices may be used also at Room Tem­per­a­ture (RT) as fast multi-band sen­sors for pho­tons rang­ing from vis­i­ble light to hard X-rays. More­over, in­ter­nal charge-am­pli­fi­ca­tion mech­a­nism can be ap­plied for very low sig­nal lev­els, while the high car­rier mo­bil­ity al­lows the de­sign of very fast pho­ton de­tec­tors with sub-nanosec­ond re­sponse times. Seg­mented QW sen­sors have been pre­lim­i­nary tested with 100-fs-wide UV laser pulses and X-ray SR. The re­ported re­sults in­di­cate that these de­vices re­spond with 100-ps rise-times to ul­tra-fast UV laser pulses. Be­sides, X-ray tests have shown that these de­tec­tors are sen­si­tive to beam po­si­tion and ex­hibit a good ef­fi­ciency in the col­lec­tion of photo-gen­er­ated car­ri­ers.