Optical amplification in nematics doped with carbon nanotubes

Wei Lee*, Sheng Long Yeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


We present results on the orientational photorefractive effect in a mesogenic nematic doped with multiwalled carbon nanotubes. Efficient coherent-beam amplification of a signal beam by energy exchange with a pump beam was observed in homogeneous cells of the doped liquid crystal E7 at electric fields of ∼0.5 V/μm. Photorefractive gains as high as 103 cm-1 are achieved in the Raman-Nath regime. It is found that the gain coefficient depends strongly on the externally applied dc voltage, the pump/probe intensity ratio and the total input intensity.

Original languageEnglish
Pages (from-to)4488-4490
Number of pages3
JournalApplied Physics Letters
Issue number27
StatePublished - 31 Dec 2001

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