A5061490538- Near-Field Optical Microscopy
- Integrated Circuits and Semiconductor Failure Analysis
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Laser Material Processing Techniques
- Supramolecular Chemistry and Complexes
- Porphyrin and Phthalocyanine Chemistry
- Atomic and Subatomic Physics Research
- Photoreceptor and optogenetics research
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Advanced optical system design
- Mechanical and Optical Resonators
- Orbital Angular Momentum in Optics
- Cultural Insights and Digital Impacts
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Vascular anomalies and interventions
- Laser Applications in Dentistry and Medicine
- Plasmonic and Surface Plasmon Research
- Molecular Junctions and Nanostructures
- Electrowetting and Microfluidic Technologies
- Diamond and Carbon-based Materials Research
Université de Strasbourg
2017-2023
Centre National de la Recherche Scientifique
2017-2023
Institut de Physique et Chimie des Matériaux de Strasbourg
2017-2023
Laboratoire des Sciences de l'Ingénieur, de l'Informatique et de l'Imagerie
2017-2020
Abstract The rational engineering of photoresponsive materials, e.g., light-driven molecular motors, is a challenging task. Here, we use structure-related design rules to prepare prototype rotary motor capable completing an entire revolution using, exclusively, the sequential absorption two photons; i.e., photon-only two-stroke motor. mechanism rotation then characterised using combination non-adiabatic dynamics simulations and transient spectroscopy measurements. results show that rotor...
A novel oxindole-based light-driven molecular motor with pronounced push–pull character was investigated. The rotary mechanism stands in between the precessional motion of fluorene-based motors and axial biomimetic photoswitches.
The experimental investigation of the unidirectional motion characterizing photoisomerization single-molecule rotary motors requires accessible lab prototypes featuring an electronic circular dichroism (ECD) signal that is sensitive to geometrical and changes occurring during ultrafast reactive process. Here we report a combined experimental/computational study candidate obtained via asymmetrization light-driven biomimetic molecular switch. We show achieved motor has ECD band remarkably...
Microsphere-assisted microscopy is a sub-diffraction-limited imaging technique, which uses dielectric microspheres to collect the near-field information of an object. In this work, bulk classical microsphere-based system reduced by simple introduction ball lens. The miniaturized has been designed and vertically assembled. Performance proposed dual-sphere quantified through numerical simulations experiments. A theoretical impulse response with full width at half maximum smaller than...
We demonstrate the key role of laser injection into a multimode fiber to obtain photonic jet (PJ). PJ, high concentrated propagating beam with full width at half maximum smaller than diffraction limit, is here generated shaped optical tip using pulsed source (1064~nm, 100~ns, 35~kHz). Three systems light are compared. For similar etched marks on silicon diameters around 1~$\mu$m, we show that required ablation energy minimum when injected close fundamental mode diameter fiber. Thus, confirm...
The photonic nanojet (PNJ) generated by a shaped optical fiber tip is an attractive technology for laser micro-machining. working distance has the same order of size as core diameter; therefore, multimode (MM) fibers are generally preferred. However, PNJ due to fundamental mode and, energy coupled on high-order modes does not contribute process. We demonstrate benefit large-mode-area (LMA) in generation PNJ. A homemade 40 μm field diameter LMA compared with 100/140 MM-shaped tip. Similar...
Compact wide-angle lenses with adjustable focus have a broad range of applications in emerging technologies. The standard approach to designing variable focal length is move group along the optical axis. These systems are often bulky due need for displacements few millimeters or centimeters. To create compact wide angle lens length, we propose system including Alvarez and aspherical lenses. complete 18mm long, has cutoff frequency over 223 lp/mm considering three wavelengths visible range:...
A photonic nanojet is a highly concentrated laser beam observed in the vicinity of dielectric micro-objects such as glass micro-spheres. Thanks to concentration beyond diffraction limit, giving spot with width smaller than half-wavelength, incident power density can be multiplied by factor larger 200. Photonic jet obtained microspheres has been applied successfully material ablation. It demonstrated that ablation on metal or have half-wavelength using common infrared nanosecond pulse laser....
Photonic jet allows light to be focused beyond the diffraction limite using dieletrc microspheres or optical fiber shaped tips. We demonstrate possibility perform sub-micrometer laser etching on semiconductor with this technique
The photonic nanojet (PNJ) was first reported by Chen et al.in 2004 through finite-difference time domain modeling of cylindrical structures under plan wave illumination. PNJ is a propagative beam with full width at half maximum (FWHM) slightly smaller than wavelength. power density can be more 200 times higher the one incident wave. This concentration achieved using transparent dielectric microcylinder wavelength-scale radius. Gustav Mie obtained exact solution Maxwell's equations for...