Electron-beam tunable interference filter spatial light modulator with 10 μs switch time

A. C. Walker, S. D. Smith, R. A. Wilson, R. J. Campbell, J. G H Mathew

Research output: Contribution to journalArticlepeer-review


The electron beam tunable interference filter spatial light modulator (ETIF-SLM), which combines the established technologies of the cathode ray tube with nonlinear interference filters (NLIF), could find applications in cross-bar and other array switching configurations. In this work the NLIF is a ZnSe/ThF4 multilayer thin film structure based on the BEAT device geometry, i.e., with an external absorbing layer. The high thermo-optic coefficient of the ZnSe spacer (dn/dT = 2×10-4K-1) allows the passband of the interference filter to be shifted by the temperature changes induced by the power absorbed from either the optical input or the e-beam. The general concept of this device has been demonstrated previously using a low voltage vidicon tube with large e-beam spot size (500 µm diameter). The author describe the use of a miniature CRT with 25-60 µm spot size, to make an ETIF-SLM with a factor of > 100 faster response and 10 times better spatial resolution.

Original languageEnglish
Pages (from-to)399-401
Number of pages3
JournalProceedings of SPIE - the International Society for Optical Engineering
Publication statusPublished - 1990
Event1990 International Topical Meeting on Optical Computing - Kobe, Jpn
Duration: 8 Apr 199012 Apr 1990


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