Luciano De Sio

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Publications associées (10)

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We report an electro-responsive and pressure sensitive device based on conductive polydimethylsiloxane (PDMS) combined with a short pitch Cholesteric Liquid Crystal (CLC). Ion-implantation and surface chemistry in PDMS enable both the induction of conducting properties in this elastomer, as well as a long range organization of the CLC. Sample electro-optical and pressure dependent optical properties are explored by applying a modulated electric field through the conducting PDMS and an uniform pressure on the top cover substrate. We show that both an electric field of few V/µm and an external pressure of up to 128 KPa can tune the reflection band by about 100 nm

2013

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We report our recent efforts on the realization and characterization of a conductive polydimethylsiloxane (PDMS) microstructure containing liquid crystals (LC). The sample has been realized by means of a layer by layer strategy. An indium tin oxide (ITO) layer has been sputtered on PDMS by utilizing thermal evaporation technique; an inter-diffusive scenario, leading to the embedding of the ITO layers within the PDMS matrix, makes the structure conductive and still morphologically homogeneous, even after mechanical stretching and deformation are applied to the sample. Then, the microstructure has been functionalized with an amorphous film of SiOx, infiltrated with an anisotropic and reconfigurable fluid (nematic liquid crystal, NLC) and characterized in terms of morphological, optical and electro-optical properties.

Taylor & Francis Ltd2013

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Electro-switchable polydimethylsiloxane-based optofluidics

Luciano De Sio, Marilisa Romito, Andreas Vasdekis

We report on the fabrication and characterization of a new generation of electro-switchable optofluidic devices based on flexible substrates, combined with the extraordinary properties of reconfigurable soft-materials. A conductive polydimethylsiloxane microstructure has been first sputtered with an Indium Tin Oxide (ITO) layer and then functionalized with an amorphous film of SiOx. Then, the "layer" by "layer" microstructure has been infiltrated with an anisotropic and reconfigurable fluid (Nematic Liquid Crystal, NLC). The sample has been characterized in terms of morphological, optical and electro-optical properties: the soft-conductive microstructure exhibits a uniform and regular morphology, even after testing with mechanical stretching and deformations. Combination of the conductive ITO with the functionalization film (which has been employed for inducing in-plane alignment of NLC molecules) enables us to carry out a series of optical and electro-optical experiments; these confirm excellent properties in terms of a reconfigurable device and a diffractive element as well.

Royal Soc Chemistry2012

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