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.
Integrated photonics represents a fast-growing market targeting an increasing number of stakeholders and application fields. With its fabrication platform for advanced integrated photonic components in glass, FEMTOprint can produce high-precision optical and opto-mechanical connectors monolithically aligned with micro-optical elements within a single fabrication process. Therefore, no extra alignment is required and all optical elements can be positioned with sub-micron precision. We will present examples of the most common building blocks used for Integrated Photonics Circuits, i.e. fiber inlets for passive alignment, optical 3D waveguides as well as micro-optical elements for beam shaping such as micro-lenses and micro-mirrors.
Integrated photonics represents a fast-growing market targeting an increasing number of stakeholders and application fields. With its fabrication platform for advanced integrated photonic components in glass, FEMTOprint can produce high-precision optical and opto-mechanical connectors monolithically aligned with micro-optical elements within a single fabrication process. Therefore, no extra alignment is required and all optical elements can be positioned with sub-micron precision. We will present examples of the most common building blocks used for Integrated Photonics Circuits, i.e. fiber inlets for passive alignment, optical 3D waveguides as well as micro-optical elements for beam shaping such as micro-lenses and micro-mirrors.
In this study, we investigate multiple etchants and laser parameters. Interestingly, we show that there is an optimal energy dose one order of magnitude smaller than the currently used ones, and notably, at a regime where nanogratings are not yet formed. This energy dose yields higher process efficiency and lower processing time, and this, with unprecedented aspect ratio levels. We further demonstrate that for low dose exposure is the formation of laser-induced bond matrix defects in the glass matrix and not the presence of nanogratings that drives the etching selectivity.
Not only are waveguides fundamental as a light carrier, yet they are also key elements for countless optical components such as couplers, modulators and oscillators to name a few. Modulating waveguides is usually performed using electro-optics or acousto-optics principles involving, among others, specific crystals such as Lithium-Niobate or glass thermal poling to introduce second order non-linearity.
In this work, we investigate a waveguide phase-modulation based on optomechanics and in particular photoelasticity. Specifically, a fused silica suspended 3D waveguide suitable for a broad visible and near-infrared spectrum and able to carry a large single mode is implemented in the form of a double-clamped suspended beam. This optomechanical device oscillates up to kHz frequencies thanks to the use of dielectrophoresis excitation, resulting from a varying non-linear electric field. The suspended waveguide seats in a V-shape groove providing the electrostatic field. The full device is manufactured out of a single piece of silica through femtosecond laser exposure combined with chemical etching. In addition, a CO2-laser polishing step is added to achieve high surface quality and prevent scattering losses. The dynamic response of this optomechanical device can be further tuned - using the same femtosecond laser - to shift from a non-linear hardening frequency response to a linear one or to a softening mode.
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