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Proceedings Paper

2D lithium niobate microstructures: fabrication, characterization, and applications
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Paper Abstract

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.

Paper Details

Date Published: 21 April 2006
PDF: 7 pages
Proc. SPIE 6185, Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration, 61851D (21 April 2006); doi: 10.1117/12.664090
Show Author Affiliations
M. Paturzo, Istituto Nazionale di Ottica Applicata-CNR (Italy)
LENS-European Lab. for Nonlinear Spectroscopy (Italy)
P. Ferraro, Istituto Nazionale di Ottica Applicata-CNR (Italy)
P. De Natale, Istituto Nazionale di Ottica Applicata-CNR (Italy)
A. Finizio, Istituto di Cibernetica-CNR (Italy)
S. Mailis, Univ. of Southampton (United Kingdom)
M. Gioffrè, Istituto per la Microelettronica e Microsistemi-CNR (Italy)
G. Coppola, Istituto per la Microelettronica e Microsistemi-CNR (Italy)
M. Iodice, Istituto per la Microelettronica e Microsistemi-CNR (Italy)


Published in SPIE Proceedings Vol. 6185:
Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration
Hugo Thienpont; Mohammad R. Taghizadeh; Peter Van Daele; Jürgen Mohr, Editor(s)

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