Natural focusing of x rays from ferroelectric lithium niobate wafers

Stephen Durbin, Terrence Jach, Sungwon Kim, Venkatraman Gopalan

Research output: Contribution to journalArticlepeer-review


The interaction of waves with inhomogeneous media leads to the natural focusing of light, the channelling of waves into stable caustics. We have extended natural focusing to x rays, observing caustics in topographs of ferroelectric lithium niobate. Voltage across domains of reversed polarity induces perturbations to the local crystal planes, producing dramatic variations in the images. Ray tracing shows a "catastrophic" discontinuity, causing bright focal lines. Analysis reveals details of boundary strains and local ferroelectric properties. Controlled focusing could be extended to designed domain patterns to probe microstructural properties, and also to a type of voltage-controlled ferroelectric optics for x rays.

Original languageEnglish (US)
Article number142909
JournalApplied Physics Letters
Issue number14
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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