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Reversible light-matter interfaces are crucial elements in quantum optics and quantum information networks. In particular, the coupling of one-dimensional bosonic nanoscale waveguides and cold atoms appears as a promising pathway to build strong light-matter interaction thanks to the tight transverse confinement of light.
Optical frequency combs in space bear the prospect of dramatically improving satellite navigation and they may pave the pathway for various space applications like satellite formation flights, global satellite navigation, earth observation, and satellite-based fundamental tests of physical constants [1]. Here we report on a precision ranging system based on a dual-comb architecture aiming for fast...
Neutral atoms trapped inside an optical cavity provide an ideal platform for the implementation of quantum networks [1]. In such a network, nodes containing multiple atomic qubits are essential for the construction of a quantum repeater as they allow for entanglement swapping and thus the generation of entanglement between qubits over long distances. Here we will show the realisation of such a multi-qubit...
When light propagates in a turbid medium, multiple scattering prevents it from reaching depths much greater than the mean free path. This limited propagation presents a problem for many fields where optical energy delivery through scattering media is critical, such as energy conversion in dye-sensitized solar cells, light-based medical techniques, or white LEDs. In this work we show that wavefront...
Their inherently broadband gain and high value of the third order nonlinearity makes quantum cascade lasers (QCLs) ideal candidates for frequency comb generation in the terahertz (THz) and mid-infrared (midIR) spectral ranges. In recent years, it has been demonstrated that free running QCLs can produce broad comb spectra, even without any special endeavour to induce phase-locking of the lasing modes...
We have realized a hybrid opto-electro-mechanical system [1], consisting of a radiofrequency (rf) resonato: capacitively coupled to a nanomechanical membrane, and read-out at the shot noise level by an optica interferometer. The oscillation of the mechanical resonator can alter the capacitance of the radiofrequency resonator leading to the modulation of transmitted signal. In our setup the rf resonator...
The main limitation of second-order nonlinear optical materials is the requirement of non-centrosymmetry within the electric-dipole approximation. However, higher multipole effects (such as magnetic-dipole and electric-quadrupole) do not suffer from such restriction. Thus, multipole effects can provide an interesting path towards novel second-order materials. Although multipole effects have been already...
Substrate-transferred crystalline coatings represent an entirely new concept in high-performance optical interference coatings. This technology was developed as a solution to the long-standing thermal noise limitation found in ultrastable optical interferometers, impacting cavity-stabilized laser systems for precision spectroscopy and optical atomic clocks, as well as interferometric gravitational-wave...
Multilevel modulations are becoming attractive, not only for metro-core optical communications, but also for the access sector. Designing cost-effective, easy-to-integrate multilevel modulators is mandatory to support high-bandwidth access interconnections, which may also require colorless operation. In this work, we propose a novel colorless multilevel transmitter architecture, based on reflective...
Technology for self-driving vehicles is currently under heavy development. Reliable autonomous driving requires precise information from different sensors, in order to establish a realistic and accurate model of the vehicle's environment. Time-of-Flight (ToF) sensors can contribute valuable information to such a vehicle's sensor network [1]. The influence of weather effects, in particular rain droplets,...
Porous materials are ideally suited for gas sensing, characterized by large effective surface area and allowing for adsorption and capillary condensation of volatile organic chemicals. Porous silicon (PSi) fabrication is easily controlled, leading to highly definable parameters such as porosity and refractive index. In practical cases however, PSi sensors suffer from a lack of selectivity problem...
Promising potential of several novel ternary crystals (TI4YXS3, Y=Sn, Pb; X=S, Te) for applications in infrared (IR) optoelectronics, LEDs (light emitting diodes) and photodetectors operating in the middle and far IR spectral ranges has been demonstrated in the present work. Besides, these materials can be used as thermoelectric materials [1], IR harmonic frequency triggers, modulators, optical memory...
High brightness semiconductor laser sources with modulation capacity are emerging candidates for an increasing number of applications. We have recently presented an integrated three section Master Oscillator Power Amplifier (MOPA) [1] to be used in space-borne Random Modulated Continuous Wave (RM-CW) Integrated Path Differential Absorption (IPDA) lidar systems for atmospheric CO2 detection [2]. The...
Photonic crystals (PhCs) provide light trapping properties that allow people to control the flow of light, and three dimensional PhCs have been proposed as the most efficient light trapping microstructures [1]. The photonic band structure is the most important optical property of a PhC, which describes the dispersion relation for propagating modes within the structure. By measuring the bandstructure...
The chalcogenides represent a unique material platform, capable of providing high-index dielectric, plasmonic, ‘epsilon-near-zero’ (ENZ) or topological insulator properties when the constituent elements are combined in the right proportion. Moreover, they can exhibit reversible, non-volatile structural transitions between solid phases with vastly different electromagnetic properties. We report here...
Induced broadband supercontinua via long pulses in solid-core optical fibres has been the subject of huge research in the recent years, after the evidence presented by Solli et al. that the output spectra contain statistically rare rogue events with large intensities and enhanced redshift [1]. In this work, we report new missing details on the dynamics that proceed the rogue-soliton generation [2]...
Surface states have a fundamental role in many modem technologies as well as in the field-matter interaction exhibited by material surfaces. Their manipulation can be used to functionalise surfaces into devices, enabling or enhancing specific physical mechanism [1]. Many rising technologies, such as photovoltaic metasurfaces, rely on thin-layer semiconductors [2, 3]. Most semiconductor surfaces exhibit...
Thin-film-based LiNbOs components have been experiencing an increasing success over the past decade due to their potentiality to enhance electro-optical (EO) or nonlinear (NL) effects [1, 2]. Therefore, their production at low cost is becoming a major challenge. In [3, 4], we proposed a precise-dicing-based technique for the low-cost production of confined LiNbO3 waveguides with integrated Spot-Size-Converters,...
Transformation optics makes use of coordinate transformations to explore the possibilities offered by artificially structured metamaterials for the manipulation of a wide variety of electromagnetic phenomena. Since a decade, transformation optics has consistently extended its scope. Initially, coordinate transformations were only applied to the transformation of light in the simplest of optical setups,...
We show for the first time that, contrary to common expectations, transition to superconductivity affects plasmonic behaviour of niobium at optical frequencies. This result is unexpected as photon energy is orders of magnitude higher than the binding energy of the Cooper pairs, the superconducting charge carriers.
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