Publications de Julien Cuennet

Integration of liquid crystals molecules in optofluidic devices

It is in the context of miniaturization that arises the microfluidics concept. It is not uncommon in chemical, biological or medical analysis laboratories to manipulate or to mix fluids while measuring the results with filters, spectrometers or all other e ...

EPFL2014

Optofluidic-tunable color filters and spectroscopy based on liquid-crystal microflows

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis

The integration of color filters with microfluidics has attracted substantial attention in recent years, for on-chip absorption, fluorescence, or Raman analysis. We describe such tunable filters based on the micro-flow of liquid crystals. The filter operat ...

Royal Society of Chemistry2013

Light filter and method for using such filter

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis

The invention concerns a light filter comprising a plate defined by a length along a direction x, a width along a direction y and a height along a direction z said plate including at least one chamber containing Liquid Crystals (LC) molecules and which is ...

2012

Optofluidic modulator based on peristaltic nematogen microflows

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis, 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

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis, 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

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis, 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

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

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis, 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