Picosecond spectroscopy of optical nonlinearities in amorphous silicon-carbon alloys

A. K. Darzi, U. Eicker, B. S. Wherrett, J. I B Wilson

Research output: Contribution to journalArticle

Abstract

We have studied nonlinear refraction and absorption of band-gap tuned hydrogenated amorphous silicon-carbon alloys using 532-nm picosecond degenerate four-wave-mixing, transient grating and excite/probe techniques. The highest induced absorption cross sections are obtained for low band-gap samples. By comparison, grating diffraction efficiencies increase with band gap, indicating stronger refractive index contributions. The results from the four-wave-mixing and excite/probe experiments are combined to calculate refractive index cross sections sn and to derive the nonlinear coefficients n 2 and ?(3); these suggest useful strong optical nonlinearities in these amorphous alloys.

Original languageEnglish
Pages (from-to)443-447
Number of pages5
JournalJournal of Applied Physics
Volume67
Issue number1
DOIs
Publication statusPublished - 1990

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