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Hybridized nanostructures composed by metals and dielectrics, semiconductors or organics offer new opportunities achieving new functionalities in nonlinear optics, plasmonics, sensing [1-4]. In particular GaAs-AlGaAs-GaAs core-shell-supershell nanowires (NWs) fabricated by self-catalyzed growth on Si substrates were partially covered with gold, thus producing a symmetry breaking in the sample geometry...
Nanowaveguides (NWs) are valuable components for building miniaturized optical devices since they have both nanoscale and microscale dimensions. One can further extend the NW application range by exploiting nonlinear optical effects such as second-harmonic (SH) and sum-frequency (SF) generation. Lithium niobate (LiNbO3) NWs and nanopillars are demonstrated to generate and guide SH [1-4] and SF [5]...
A current challenge and trend in optical sciences is to extend the toolbox generated from experiments with single emitters and single photons towards interfacing photons with a well-defined number of quantum emitters. The resulting complex optical network would enable studies of many-body quantum optical phenomena and could lend itself to quantum simulations. However, common light-matter interfaces...
The intrinsic properties of silicon (Si) make it an excellent material for integrated photonics devices with small footprints [1]. To date, most of the reported devices have been based on crystalline silicon (c-Si), but this material suffers from difficult integration with electronic layers due to fabrication constraints. Subsequently, there has been growing interest in alternative forms of Si, such...
Measurements of quantum states of photons are conventionally performed with series of optical elements in bulk setups [1] or optical chips incorporating multiple tunable beam splitters. Here, we suggest and develop experimentally, for the first time to our knowledge, a new concept of quantum-polarization measurements with a single all-dielectric resonant metasurface [2]. The operating principle is...
In recent years, the fabrication, structural modification and characterisation of nanostructured materials have gained a great deal of attention due to their distinctive properties and potential use in technological applications. Glass containing silver (Ag) nanoparticles (NP), or Metal-Glass Nanocomposite (MGN), is routinely used as high-contrast optical polarisers [1], and has been recently shown...
Spectrometers are widely used for scientific experiments in all different fields and for real-time monitoring. In several setups it is necessary to measure a spectrum at different positions over time [1], but with most spectrometers it is only possible to measure one spectrum at a time. For measuring two or more spectra simultaneously, several spectrometers are necessary which increases costs. In...
Lithium niobate (LiNbO3) is a unique crystal that demonstrates a large range of properties such as photo-refractivity, electro-optical effect and piezoelectricity. Besides, the LiNbO3 crystal also possesses strong nonlinear optical properties, which are maintained in subwavelength structures such as nanowires. Thus, LiNbO3 nanowires and microwires are demonstrated to generate and guide the second-harmonic...
Organic dye molecules have been used in great many scientific and technological applications. Among these, the polycyclic aromatic hydrocarbons (PAH) behave very favourably as quantum emitters when embedded in organic crystals at temperatures below 4K. PAHs can serve as solid-state emitters with remarkable optical properties such as near-unity quantum efficiency and high photostability. However, transitions...
The large field enhancement generated at the surface of a resonant plasmonic nanoparticle, or optical antennas, is the key mechanism that eventually led to the development of nonlinear plasmonics [1-2]. While the resonance may boost the nonlinear yield of an adjacent structure or surrounding medium, it was soon realized that optical antennas possess nonlinear coefficients comparable or exceeding those...
Small-scale optical devices, designed and fabricated onto one dielectric substrate create integrated optical chip like their microelectronic analogues, and allow transmission, distribution, modulation, and processing of optical signals in optical communication systems, chemical and biological sensors, and more. The key component of these optical circuits providing both optical processing and photonic...
Metamaterials and metasurfaces are artificial structures whose optical properties go beyond the natural behaviour of light. Their appeal revolves around the possibility to design the optical response by changing the geometry of the structure using essentially the same material constituents [1]. Some classes of metamaterials and metasurfaces can be fabricated over macroscopic areas and have strong...
Recently, the concept of the geometric Pancharatnam-Berry (P-B) phase has been successfully extended to optical metasurfaces operating in the nonlinear regime1–3. It was shown that the nonlinear geometric P-B phase of each meta-atom is determined by the spin of the fundamental wave, the spin of the nonlinear signal, and the order of the nonlinear process1. By manipulating the interferences of SHG...
In optical metasurfaces, disorder, e.g. in the arrangement or shape of its building blocks, is usually associated with a deterioration of the optical properties due to an increase of incoherent scattering. However, more recently, researchers have started recognizing the introduction of controlled disorder as a strategy to diversify engineering options of metasurfaces. For example, the introduction...
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