F. Simoni
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Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals Open
Higher-order reflections from a cholesteric liquid crystal have been investigated for a long time after early observations of an oblique incidence of light. Even with the restriction of the required oblique geometry, wavelength tuning woul…
View article: Up to 200% of the excitation frequency in compressive FLIM: a constraint-free pile-up correction methodology for advanced biomedical imaging
Up to 200% of the excitation frequency in compressive FLIM: a constraint-free pile-up correction methodology for advanced biomedical imaging Open
Time-correlated single-photon counting (TCSPC) stands at the forefront of low-intensity light detection techniques, providing unparalleled sensitivity and timing precision in the reconstruction of faint and rapid optical signals. The growi…
Optical properties of Heliconical Cholesterics: effects of losses and photonic density of states Open
The investigation of both linear and nonlinear optical properties of Heliconical Cholesteric has been triggered by the easy tuning of the Bragg resonance that can be achieved either by low-frequency electric field or by light waves. Howeve…
View article: Optofluidic flow cytometer with in-plane spherical mirror for signals enhancement
Optofluidic flow cytometer with in-plane spherical mirror for signals enhancement Open
Statistical analysis of properties of single microparticles, such as cells, bacteria or plastic slivers, has attracted increasing interest in recent years. In this field flow cytometry is considered the gold standard technique, but commerc…
View article: Optofluidic Flow Cytometer with In-Plane Spherical Mirror for Signal Enhancement
Optofluidic Flow Cytometer with In-Plane Spherical Mirror for Signal Enhancement Open
Statistical analysis of the properties of single microparticles, such as cells, bacteria or plastic slivers, has attracted increasing interest in recent years. In this regard, field flow cytometry is considered the gold standard technique,…
Light-Induced Self-Oscillations and Spoiling of the Bragg Resonance Due to Nonlinear Optical Propagation in Heliconical Cholesteric Liquid Crystals Open
In a recent paper, we have reported the results of a study of the nonlinear light propagation of a beam traveling along the helix direction of a heliconical cholesteric liquid crystal, showing that optical reorientation leads to instabilit…
Optical control of light polarization in heliconical cholesteric liquid crystals Open
We show here that light polarization of a beam propagating through a heliconical cholesteric cell can be controlled by tuning the Bragg resonance of the structure. We demonstrate that this control is achieved by varying either the low-freq…
Onset of Optical Instabilities in the Nonlinear Optical Transmission of Heliconical Cholesteric Liquid Crystals Open
We report the result of an accurate calculation of optical transmission of a light beam traveling along the helix direction of a heliconical cholesteric liquid crystal when the light intensity is affecting the director orientation by an ef…
Heliconical Cholesterics: new opportunities for optofluidics? Open
In this presentation the novelty represented by the heliconical cholesteric liquid crystals (Ch-OH) for easy electric and optical control of optical properties are highlighted. After a quick summary of their electro-optical properties, an …
Photo-Responsivity Improvement of Photo-Mobile Polymers Actuators Based on a Novel LCs/Azobenzene Copolymer and ZnO Nanoparticles Network Open
The efficiency of photomobile polymers (PMP) in the conversion of light into mechanical work plays a fundamental role in achieving cutting-edge innovation in the development of novel applications ranging from energy harvesting to sensor ap…
View article: Optofluidic Platform Based on Liquid Crystals in X-Cut Lithium Niobate: Thresholdless All-Optical Response
Optofluidic Platform Based on Liquid Crystals in X-Cut Lithium Niobate: Thresholdless All-Optical Response Open
In this study, we present a new configuration of the recently reported optofluidic platform exploiting liquid crystals reorientation in lithium niobate channels. In order to avoid the threshold behaviour observed in the optical control of …
Shape-driven optofluidic rotational actuation Open
In the present work, we report light-induced rotation of millimeter-sized objects driven by their non-symmetric shape. The light-induced torque is originated by the thermal gradient on different sides of the teeth of star-shaped objects fl…
Plasmonic Photomobile Polymer Films Open
In this work, we introduce the approaches currently followed to realize photomobile polymer films and remark on the main features of the system based on a biphasic structure recently proposed. We describe a method of making a plasmonic nan…
Pitch tuning induced by optical torque in heliconical cholesteric liquid crystals Open
Heliconical cholesteric liquid crystals are expected to be more sensitive to torque induced by light field since their structure allows both bend and twist in molecular orientations, differently from the conventional cholesterics in which …
Pitch tuning induced by optical torque in heliconical cholesteric liquid crystals Open
Heliconical cholesteric liquid crystals are expected to be more sensitive to torque induced by light field since their structure allows both bend and twist in molecular orientations, differently from the conventional cholesterics in which …
Light-actuated contactless macro motors exploiting Bénard–Marangoni convection Open
Near-infrared light is commonly used to move small objects floating on water by exploiting the Bénard-Marangoni convection. This is because infrared light is absorbed well by water and the induced thermal gradients are responsible for the …
Giant optical nonlinearity in DNA lyotropic liquid crystals Open
We report the experimental evidence of nonlinear optical response in DNA lyotropic nematic liquid crystals. Pump-probe experiments indicate that the non-linearity is remarkably large. Quantitative assessment of the non-linear optical coeff…
Optofluidic Microlasers based on Femtosecond Micromachining Technology Open
We present the different optofluidic lasers which have been realized using the Femtosecond Micromachining technique to fabricate the monolithic optofluidic structures in glass chips. We show how the great flexibility of this 3D technique a…
Low threshold Fabry-Perot optofluidic resonator fabricated by femtosecond laser micromachining Open
We report the realization and characterization of an optofluidic microlaser based on a Fabry-Perot resonator fabricated by exploiting two direct writing fabrication techniques: the femtosecond laser micromachining and the inkjet printing t…
Liquid crystal cells based on photovoltaic substrates Open
Liquid crystal cells with LiNbO3:Fe crystals as substrates, are described. The photovoltaic field generated by the substrates is able to reorient the liquid crystal director thus giving rise to a phase shift on the light propagating throug…