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The possible targeting functionality and low immunogenicity of exosomes and exosome‐like nanovesicles make them promising as drug‐delivery carriers. To tap into this potential, accurate non‐destructive methods to load them and characterize their contents are of utmost importance. However, the small size, polydispersity, and aggregation of nanovesicles in solution make quantitative characterizations...
Lithium niobate (LiNbO3, LN) is widely used for photonic applications, thanks to its wide transparency range, electro-optic and nonlinear optical properties [1]. Recently available lithium-niobate-on-insulator (LNOI) substrates afford high index contrast and thus tight field confinement in LN photonic devices such as optical modulators and microring resonators [2, 3]. However, similar to other (e...
The efficiency and engineering capabilities afforded by parametric processes in second-order [χ(2)] nonlinear media have tremendously benefitted from periodic poling technologies in ferroelectric materials such as LiNbO3, nowadays routinely exploited in optical parametric generators, amplifiers and oscillators, as well as high brightness sources of entangled photons [1, 2]. Nonlinear photonic crystals...
Thanks to its nonlinear-, electro- and acousto-optical and piezo-response properties [1], lithium niobate (LiNbOs, LN) is widely used for many photonic applications. The high refractive index contrast offered by recently available thin film lithium-niobate-on-insulator (LNOI) platforms, provides new possibilities for miniaturizing LN-based integrated optics structures such as submicron waveguides...
The talk will briefly introduce the technology and design principles for quadratic nonlinear photonic crystals and provide a few examples of optical functionalities affordable on this platform, with a particular focus on recent developments concerning frequency down-conversion and their implications for the engineering of novel parametric light sources for classical and quantum optics applications.
We investigate experimentally the spectral and angular degrees of freedom of multi-resonant optical parametric generation in hexagonally poled LiTaO3 and demonstrate access to twin-beam output for either signal or idler waves by pump angle tuning.
Recent advances in the growth of ferroelectric crystals with low optical losses and good structural consistency in particular KTiOPO4 and stoichiomethic Mg:LiTaO3 allowed a vast extension of applicability of quasi-phase-matched frequency converters. In this paper we overview recent advances in structuring these materials enabling high-energy pulse generation, extremely broadband parametric gain, and...
We demonstrate twin-beam parametric generation arising from the coherent locking of two resonances of a purely nonlinear lattice, implemented with hexagonally poled LiTaO3. The experiments provide a first example for the novel engineering capabilities affordable in frequency-downconversion with quadratic photonic crystals, to be exploited for novel parametric sources in classical and quantum optics.
We experimentally investigate parametric downconversion approaching zero group velocity dispersion in Mg-doped stoichiometric LiTaO3. Pumping in the 820-842 nm range yields a 14 THz gain bandwidth with signal (idler) wavelengths around 1.23 μm (2.66 μm).
We propose and experimentally demonstrate error-free OTDM to WDM format conversion based on cSHG/DFG within a 30 mm-long PPLN waveguide and a time-to-frequency domain conversion approach, which relies upon switching a linearly chirped pulse.
We report on the first observation of spatial solitons in a 2D nonlinear photonic crystal. The experiments were performed in an hexagonally poled LiNbO3 waveguide designed for second harmonic generation from ~1.55 ??m.
Incoherent broad-bandwidth cw-pumped singly resonant optical parametric oscillator (OPO), in the quasi-phase-matched non-degenerate configuration, may efficiently generate ultra-coherent signal output by the convection-induced phase-locking mechanism in which the incoherence of the pump is absorbed by the idler wave allowing the signal to become highly coherent. In actual nonlinear quadratic waveguide...
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