Publications de Luciano De Sio

Optofluidic Microstructures Containing Liquid Crystals

Andreas Vasdekis, Marilisa Romito, Luciano De Sio

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) l ...

Taylor & Francis Ltd2013

Electro-switchable polydimethylsiloxane-based optofluidics

Andreas Vasdekis, Marilisa Romito, Luciano De Sio

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 mic ...

Royal Soc Chemistry2012

Realization and Characterization of POLICRYPS-like Structures Including Metallic Subentities

Toralf Scharf, Luciano De Sio

A first characterization of newly realized micro periodic structures including metallic nanoparticles is reported. The original mixture, generally utilized for the realization of polymer-liquid-crystal-polymer-slices gratings (POLICRYPS), has been enriched ...

2012

Optofluidic modulator based on peristaltic nematogen microflows

Demetri Psaltis, Andreas Vasdekis, Julien Cuennet, Luciano De Sio

Nematogens rotate by the application of external fields, thereby enabling optical modulation. This principle has had a profound impact on our daily lives through the plethora of liquid-crystal displays in use around us(1,2). However, the wider use of nemat ...

Nature Publishing Group2011

Silicon oxide deposition for enhanced optical switching in polydimethylsiloxane-liquid crystal hybrids

Demetri Psaltis, Andreas Vasdekis, Julien Cuennet, Luciano De Sio

We report an optical switch based on a diffraction grating by combining PDMS microstructures with a photo-responsive Nematic Liquid Crystal (NLC). The grating was realized via replica molding and was subsequently coated with a thin SiO layer. SiO induced a ...

2011

Light modulation enabled by liquid crystal microflows

Demetri Psaltis, Andreas Vasdekis, Julien Cuennet, Luciano De Sio

In a previous paper, 1 we proposed an optofluidic modulator based on peristaltic flow. A microchannel made of polydimethylsiloxane is filled with nematic liquid crystal molecules that align homeotropically in the steady state. Once we apply a periodic peri ...

2011

Surface optofluidics

Demetri Psaltis, Andreas Vasdekis, Wuzhou Song, Jae-Woo Choi, Julien Cuennet, Luciano De Sio

Surfaces -defined as the interfaces between solids and liquids- have attracted much attention in optics and biology, such as total internal reflection imaging (TIRF) and DNA microarrays. Within the context of optofluidics however, surfaces have received li ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

All-optical switching in an optofluidic polydimethylsiloxane: Liquid crystal grating defined by cast-molding

Demetri Psaltis, Andreas Vasdekis, Julien Cuennet, Luciano De Sio

We report an optofluidic photoswitchable grating, based on a polydimethylsiloxane periodic structure on a glass substrate, separated by a thin liquid crystal film. The polydimethylsiloxane microstructure was realized via high resolution replica molding and ...

2010