High contrast, ultrafast optically addressed ultraviolet light modulator based upon optical anisotropy in ZnO films grown on R-plane sapphire

M. Wraback, H. Shen, S. Liang, C. R. Gorla, Y. Lu

Research output: Contribution to journalArticlepeer-review

155 Scopus citations

Abstract

An optically addressed ultraviolet light modulator has been demonstrated which exploits the optical anisotropy in a ZnO film epitaxially grown on (0112) sapphire. This device achieves both high contrast and high speed by exploiting the anisotropic bleaching of the anisotropic absorption and concomitant ultrafast polarization rotation near the lowest exciton resonances produced by femtosecond ultraviolet pulses. The resultant modulation is characterized by a contrast ratio of 70:1. corresponding to a dynamic polarization rotation of 12° and it decays to a quasiequilibrium value within 100 ps.

Original languageEnglish (US)
Pages (from-to)507-509
Number of pages3
JournalApplied Physics Letters
Volume74
Issue number4
DOIs
StatePublished - Jan 25 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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