2D lithium niobate microstructures: Fabrication, characterization, and applications

M. Paturzo, P. Ferraro, P. De Natale, A. Finizio, S. Mailis, M. Gioffrè, G. Coppola, M. Iodice

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


This work concerns the fabrication, optical characterization and potential applications of two types of microstructures manufactured in congruent lithium niobate. The first type consists of a simple 2D hexagonal lattice of inverted ferroelectric domains fabricated by standard electric field poling at room temperature. The second structure is the chemically etched version of the first one. Long etching in hot HF acid results in differential etching of opposite ferroelectric domain faces. In this way obtain a 3D structure is obtained in which the hexagonal domain array becomes an array of truncated pyramids. Both these structures are characterized through a digital interferometric analysis. The samples are inserted in the arm of a Mach-Zenhder interferometer and the digital holograms acquired are used to numerically reconstruct both the amplitude and the phase of the wavefront transmitted by the sample. Finally, we report on the possible applications of the fabricated structures. The hexagonally poled structure can be used as a variable binary phase array. In fact both sides of the poled sample are covered with a thin conductive layer (ITO), which acts as transparent electrode. By applying an external electric field it is possible to change the difference between the two phase levels, via the linear electro-optic effect, and, consequently, the distribution of light intensity in the diffracted orders. On the other hand, the 3D structured etched sample can be used as an micrometer size integral imaging system.

Original languageEnglish
Title of host publicationMicro-Optics, VCSELs, and Photonic Interconnects II
Subtitle of host publicationFabrication, Packaging, and Integration
Publication statusPublished - 2006
Externally publishedYes
EventMicro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration - Strasbourg, France
Duration: 3 Apr 20065 Apr 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceMicro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration


  • Interferometric holography
  • Lithium niobate
  • Micro-optics
  • Phase array


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