We are now working on building a real machine of optical quantum computers based on quantum teleportation technology. The main ingredients are 10THz-bandwidth waveguide optical parametric amplifiers, 100GHz-bandwidth 5G/6G technologies and Wavelength Division Multiplexing(WDM), and nonlinear feedforward. By using these ingredients, we will build 100GHz-clock 100-multicore super quantum computers.

This presentation summarizes recent work at the Laser Thermal Laboratory on the laser-aided processing and functionalization of two-dimensional (2D) layered materials and the laser chemical processing of semiconductors.

In the fields of quantum computing and atomic clocks different technologies are competing to provide the best performances in terms of gate fidelity, coherence, and number of qubits. In this landscape, three-dimensional fabrication technologies bring an added value allowing more complex but precise electrode arrangements ideal for ion trapping. In this research, we present two 3D monolithic Paul traps produced in fused silica with femtosecond selective laser etching techniques, combined with metal coating. Monolithic design ensures intrinsic alignment of the trap electrodes down to the micron, being all produced in a single fabrication step. Precise alignment, combined with three-dimensional electrode arrangement, creates a disruptive advantage for quantum devices’ architecture. We will showcase the performance benchmarks of our traps, including the heating rate and trap harmonicity, using laser-cooled chains of Calcium ions.

Continuous monitoring of human health and activity using wearable devices will be a key technology in the sensor network society for years to come. Recent advances in the development of the miniaturized optoelectronics components with low energy consumption have opened a new perspective for the implementation of non-invasive wearable health monitoring sensors for personalised medicine. In this paper we will review our recent development of wearable sensors based on Laser Doppler flowmetry and Fluorescence spectroscopy and demonstrate potential applications for such devices.

The use of light for material processing involves the parallelism of optics to process 2 dimensional surfaces as well as precisely shaping 3 dimensional volumes in additive manufacturing. The available technology to shape light is typically 2-dimensional (2D), thus there is an unavoidable need to take 2D to 3D transformations into account to create three dimensional objects. We will show how the reverse, i.e 3D-2D transformations are relevant for the creation of three dimensional objects at the nanoscale and macroscale. This high-level comparison across different, yet related fields yield a useful perspective for 3D printing using light.

Additively manufactured electronics (AMEs), also known as printed electronics, are becoming increasingly important for the anticipated Internet of Things (IoT). Current techniques rely on ink-based printing technologies such as inkjet and aerosol jet printers, which highly suffer from contamination, expensive formulation procedures, and limited materials sources, making it challenging to print pure and multimaterial devices. Here, a multimaterial additive nanomanufacturing (M-ANM) technique utilizing directed laser deposition at the nano and microscale is demonstrated, allowing the printing of lateral and vertical hybrid structures and devices. This M-ANM technique involves pulsed laser ablation of solid targets placed on a target carousel inside the printer head for in-situ generation of contamination-free nanoparticles, which are then directed toward the nozzle and laser-sintered in real-time to form desired patterns and structures layer-by-layer. Different materials, such as Ag, Cu, ZnO, TiO2, BTO, Al2O3, etc, are printed in a single-step process. The quality and versatility of our M-ANM technique offer a potential manufacturing option for emerging IoT.

A novel 3D electromagnetic metamaterial design for Electromagnetically Induced Transparency in THz frequencies is reported. Simulations were done using finite elements method in order to optimize the geometry of the metamaterial. The structure was fabricated using Multiphoton Lithography on high resistivity Silicon substrate and further processed with Electroless Silver Plating to get the highly conductive metallic metamaterial.

Multi-photon lithography empowers additive manufacturing of free-form 3D structures. Currently it is being established for production of miniature optical elements including stacked compound components: diffractive, refractive, guiding, filtering, polarizing, and many other optical functions can be merged into monolith devices with super-wavelength and sub-wavelength features. Still such optics are limited to polymers which are low grade in context of optical materials. We present improvements in their transparency and increasing their laser induced damage threshold (LIDT). This is made by covering the micro-optics with anti-reflective coating employing atomic layer deposition (ALD) method. In contrast to previous reports, the employed material is hybrid organic-inorganic SZ2080TM substance, which be calcinated and turn the objects into glass-ceramics. The transparency after ALD is improved for a single, doublet, and triplet micro-lenses at 633 nm. The calcination increases LIDT for the micro-lenses by several times validated by S-on-1 tests. The research work opens additive manufacturing of transparent and durable 3D micro-optical components by combining ALD and calcination.

Into the linear optical regime, optical nanostructures and materials behave as linear transfer functions. In this work, we are interested in the full understanding of the spectral and time response in terms of the singularities of the transfer function in the complex frequency plane. The singular expansion method demonstrates that the linear transfer function can be fully and exactly retrieved thanks to the complex singularities, both in the harmonic and time domains. This method applies to optical materials and permits to get accurate analytic expressions of the dielectric permittivity, for which analytical expressions must comply with the properties of complex analysis. We compare the two approaches and show that the Debye Drude Lorentz method agrees with the singularity expansion method if the Lorentz term contains an imaginary term in its numerator. We carefully study the accuracy of this novel expression of the dielectric permittivity abiding the mathematical properties of the SEM and show its excellent performances for a wide range of materials.

The presentation will overview our on-going activities on the development of novel artificial materials (metamaterials), which are expected to improve current state-of-the-art label-free optical biosensing. The focus will be given to topologically dark metamaterials, which can provide the phenomenon of darkness (TD). Such a phenomenon consists in exactly zero light reflection/transmission from a dedicated optical system, which is topologically protected by spectral properties of optical constants of materials and the positioning of the zero reflection/transmission surface, and survives any structural imperfections. One of interesting effects, accompanying TD, consists in the generation of extreme singularities of phase of light reflected from a sensor transducer. When used as a sensing parameter to control biomolecular interactions, phase singularities can provide a breakthrough in sensitivity, which promises a major upgrade in the label-free detection .

We demonstrate broadband, tunable wavelength lasing emission using spherical CdS/CdSe/CdS quantum shells (QS) incorporated into distributed feedback (DFB) nanopillar Si cavities. Such QSs have recently attracted considerable attention as they exhibit strongly suppressed Auger recombination, ultralong biexciton (BX) lifetimes and broad gain bandwidth. Using only one QSs size (i.e., confinement), we demonstrate emission coupling and low threshold, narrowband lasing across wide spectral range, from single exciton (X~640 nm) to biexciton (BX~625 nm) to multiple exciton (MX~615-565 nm) transitions. The ensemble-averaged gain threshold of < N>~1.4 electron-hole pairs per QS particle and lowest pump fluence of ~ 4 uJ/cm2 result from almost completely impeded Auger recombination and low optical losses in the nanopillar cavity. These results represent a significant advance towards the development of future electrically pumped, colloidal nanocrystal lasers

This work aimed to further miniaturize pantographic metamaterials, transferring their exceptional characteristics to extremely small-length scales. To achieve this, pantographic blocks — 3D metamaterials constructed by extending 2D pantographic unit cells into the third dimension — with dimensions on the order of a few microns were fabricated using two-photon polymerization (2PP) [5]. The mechanical properties of these miniaturized structures were analyzed under relatively large deformations and cyclic loading using nanoindentation tests conducted in situ within a field emission scanning electron microscope. Subsequently, the structural failure of the compressed specimens was examined in detail using helium ion microscopy.

In this work, carbonaceous structures composed of graphitic nanocrystals, namely electrically conductive turbostratic graphite or fluorescent graphene quantum dots (GQDs), were patterned on polydimethylsiloxane (PDMS) by laser-induced graphitization. By exploiting the electrical conductivity of the turbostratic graphite and the elasticity of PDMS, a small and sensitive piezoresistive pressure sensor was realized. On the other hand, by exploiting the fluorescence of GQDs and the transparency of PDMS, an anticounterfeiting security tag containing hidden information was realized. This work indicates the implications of using laser-induced graphitization towards the fabrication of novel polymer-based electrical and optical devices.

Controlling the stacking and conversion in bilayer crystals and heterostructures by non-equilibrium synthesis and processing is very important to construct 2D moiré quantum materials. Here we will show how to introduce isotopes, laser thinning, and Raman spectroscopy to understand the bilayer growth mechanism in two-step chemical vapor deposition. Then we will describe a feedback approach to reveal and control the transformation pathways in bilayer 2D materials by pulsed laser deposition (PLD). We will focus on the transformation kinetics of bilayer WS2 crystals into Janus WSSe/WS2 and WSe2/WS2 heterostructures by hyperthermal implantation of laser-vaporized Se clusters. In situ ICCD imaging, ion probe, and spectroscopy diagnostics characterize the PLD plasma and are used to precisely control the kinetic energies of the Se species arriving at the substrate. In situ Raman spectroscopy is used to characterize the conversion kinetics and capture the metastable phases during transformation. DFT calculations, XPS, and atomic-resolution HAADF STEM are used to identify the compositions, vibrational modes, and structures for revealing the conversion mechanism of the bilayer crystals.

Laser engineering of biomimetic surfaces for specific application-based properties such as, drag reduction, omnidirectional diffraction and anti-reflection.

In this paper, we report on the “Laser Induced Transfer- LIT” method, as a digital and solvent-free approach for the single step integration of three 2D materials: Graphene, MoS2, and Bi2Se3-xSx. LIT offers digital control over the size (<10 μm resolution) and the shape of the printed of pixels. The quality and structural integrity of the transfers has been confirmed using Scanning Electron Microscopy, Atomic Force Microscopy and Raman spectroscopy. Moreover, Ab initio Molecular Dynamics Simulations have been employed to shed light on the key atomic-scale details of the Laser Transfer process.

This study reports the effects of substrate temperature and laser ablation wavelength on the structural and bioactivity properties of hydroxyapatite (HAP) coatings. The coatings were obtained using a pulsed laser deposition technique on Ti6Al4V and Si(100) substrates. Different substrate temperatures were used ranging from 25°C to 800°C. Three wavelengths of Nd:YAG pulsed laser (1064 nm, 532 nm, and 355 nm) were employed to study the ablation mechanisms and their effects on film morphology. Surface morphology was investigated by SEM with EDX Analysis and AFM. All coatings were confirmed to be grown in a granular system and it was observed that 355 nm and 532 nm produce smoother coatings. The XRD measurements showed the transition from amorphous to crystalline HAP beyond 500°C. The adhesion strength of the coatings to the substrates was analyzed by pull-out tests. Although as substrate temperature increased, adhesion also got better, further increase of temperature to 800 °C resulted in a significant decrease in bonding. Finally, the bioactivity of the coatings was assessed on multiple levels such as protein adsorption, dissolution in simulated body fluid, and cell proliferation.

The utilization of 3D printing has brought forth a plethora of opportunities in the creation of micron-scale structures using diverse nanomaterials, revolutionizing various fields. This study introduces a solution evaporation-assisted 3D printing technique for the fabrication of heterogeneous microstructures embedded with colloidal quantum dots (QDs), aiming to enhance their utility and applicability. Through this innovative approach, we achieved the successful integration of QDs within a variety of microstructural configurations, encompassing microlenses, microwires, and multi-component architectures. Systematic optical characterization of these hybrid structures revealed distinctive properties, emphasizing their potential for a wide range of practical optical applications. Our research underscores the practicality and high versatility of solution evaporation-based 3D printing in realizing complex microstructures integrated with quantum dots, offering enhanced functionality and broadened scope for future applications.