We present a study of the charge state conversion single nitrogen-vacancy (NV) defects hosted in nanodiamonds (NDs). first show that proportion negatively-charged NV$^{-}$ defects, with respect to its neutral counterpart NV$^{0}$, decreases size ND. then propose simple model based on layer electron traps located at ND surface which is good agreement recorded statistics. By using thermal oxidation remove shell amorphous carbon around NDs, we demonstrate significant increase 10-nm NDs. These...

Single KTiOPO4 nanocrystals, isolated from a flux-grown powder, efficiently generate perfectly stable and blinking-free second-harmonic field under non-resonant femtosecond optical excitation (see image). For each individual nanocrystal, size three-dimensional orientation are determined using combined atomic force microscopy techniques.

We show that a dimer made of two gold nanospheres exhibits remarkable efficiency for secondharmonic generation under femtosecond optical excitation.The detectable nonlinear emission the given particle size and excitation wavelength arises when nanoparticles are as close possible to contact, in situ controlled measured using tip an atomic force microscope.The dependence second-harmonic signal supports coupled plasmon resonance origin with radiation from gap.This nanometer-size light source...

Abstract Powered by the mutual developments in instrumentation, materials and theoretical descriptions, sensing imaging capabilities of quantum emitters solids have significantly increased past two decades. Quantum solids, whose properties resemble those atoms ions, provide alternative ways to probing natural artificial nanoscopic systems with minimum disturbance ultimate spatial resolution. Among emerging emitters, nitrogen vacancy (NV) color center diamond is an outstanding example due its...

We investigate native nitrogen vacancy (NV) and silicon (SiV) color centers in a commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. observe single, NV with density of roughly 1 per μm3 moderate coherence time (T2 = 5 μs) embedded an ensemble SiV centers. Using low temperature luminescence as probe, we prove the high crystalline quality diamond especially close to growth surface, consistent reduced dislocation density. ion implantation plasma etching,...

We report an efficient colloidal synthesis of KTiOPO4 (KTP) nanocrystals with excellent crystallinity and the direct observation optical second-harmonic generation (SHG) from discrete KTP in neurons cultured mammalian brain cortex. Direct internalization monitoring these nanoparticles was successfully achieved without limitations cytotoxicity, bleaching blinking emission.

Abstract Energy transfer between fluorescent probes lies at the heart of many applications ranging from bio‐sensing and bio‐imaging to enhanced photodetection light harvesting. In this work, Förster resonance energy (FRET) shallow defects in diamond—nitrogen‐vacancy (NV) centers—and atomically thin, 2D materials—tungsten diselenide (WSe 2 )—is studied. By means fluorescence lifetime imaging, occurrence FRET WSe /NV system is demonstrated. Further, it shown that coupled system, NV centers...

We demonstrate that the intensity of second harmonic (SH) generated in KTiOPO(4) nanoparticles excited with femtosecond laser pulses increases decreasing duration infrared pump pulses. The SH scales, approximately, as inverse pulse ranging between 13 fs and 200 fs. enhancement requires careful compensation high-order spectral phase, being achieved a genetic algorithm. Using ultrashort improves signal-to-noise ratio will allow detection 10-nm size particles. Finally, we spectrum broadband...

We present a comprehensive tensorial characterization of second-harmonic generation from silicon nitride films with varying composition. The samples were fabricated using plasma-enhanced chemical vapor deposition, and the material composition was varied by reactive gas mixture in process. found six-fold enhancement between lowest highest second-order susceptibility, value approximately 5 pm/V most silicon-rich sample. Moreover, optical losses to be sufficiently small (below 6 dB/cm) for...

Abstract Ion beam shaping is a novel and powerful tool to engineer nanocomposites with effective three-dimensional (3D) architectures. In particular, this technique offers the possibility precisely control size, shape 3D orientation of metallic nanoparticles at nanometer scale while keeping particle volume constant. Here, we use swift heavy ions xenon for irradiation in order successfully fabricate consisting anisotropic gold nanoparticle that are oriented embedded silica matrix....

While three-dimensional arrays of metallic nanoparticles in a dielectric matrix are promising candidates for plasmonic optical components and metamaterials, their fabrication remains challenging, the types structures that can be produced by conventional methods limited. The authors overcome these limitations using ion-beam irradiation to produce periodic arrangement prolate symmetric matrix, controlling both particle aspect ratio orientation. Applications aside, such structure is an ideal...

In this manuscript, we outline a reliable procedure to manufacture photonic nanostructures from single-crystal diamond (SCD). Photonic nanostructures, in our case SCD nanopillars on thin (<1 μ m) platforms, are highly relevant for nanoscale sensing. The presented top-down includes electron beam lithography (EBL) as well reactive ion etching (RIE). Our method introduces novel type of inter-layer, namely silicon, that significantly enhances the adhesion hydrogen silsesquioxane (HSQ) resist and...

We investigate bulk second-order nonlinear optical properties of amorphous indium selenide thin films fabricated by thermal evaporation. Such are shown to exhibit strong and photostable second-harmonic generation (SHG). report thickness dependence the signals as characterized Maker-fringe method. The absolute value susceptibility tensor film is addressed analyzing interference SHG from glass substrate. joint non-diagonal component found be 4 pm/V, which comparable that widely used materials.

Energy transfer between fluorescent probes lies at the heart of many applications ranging from bio-sensing and -imaging to enhanced photo-detection light harvesting. In this work, we study F\"orster resonance energy (FRET) shallow defects in diamond --- nitrogen-vacancy (NV) centers atomically-thin, two-dimensional materials tungsten diselenide (WSe$_2$). By means fluorescence lifetime imaging, demonstrate occurrence FRET WSe$_2$/NV system. Further, show that coupled system, NV provide an...

The finding of nonlinear nanometric-sized probes is key importance for the development microscopy in nanosciences and biology. We isolate KTiOPO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> nanocrystals with remarkable photostability second-harmonic generation under femtosecond infrared laser light excitation. Their size distribution determined using dynamic scattering atomic force microscopy. With both polarization analysis defocused...

We investigate the possibilities to realize light extraction from single crystal diamond (SCD) nanopillars. This was achieved by dedicated 519 nm laser-induced spin-state initiation of negatively charged nitrogen vacancies (NV−). focus on naturally-generated chemical vapor deposition (CVD) growth NV−. Applied neither implanted with 14N+, nor CVD synthesized SCD annealed. To possibility utilization NV−’s bright photoluminescence at room temperature and ambient conditions waveguiding effect,...

Chalcogenide glasses are amorphous semiconductors with a number of interesting properties required for photonic devices. Particularly, their optical can be tuned through the change glass composition. We investigate second-order nonlinear chalcogenide (Ge27Se64Sb9) thin films fabricated by thermal evaporation. The strong second-harmonic generation observed samples investigated is analyzed as function incident polarization. Furthermore, role multipole effects in also studied using two beams at...

During the last decade, many efforts have been made to develop techniques integrate nanostructures in functional matrices. This activity, mainly boosted by advances nanofabrication, has enabled development of elegant methods for planar nanodevices. However, design and implementation embedded three-dimensional (3D) nanoarchitectures with tunable spatial orientation remains a challenge. To overcome this difficulty, an alternative is offered technique sculpturing nanoparticles using ion beams...

We use ion irradiation to fabricate anisotropic gold nanorods oriented in three dimensions. Their orientation is subsequently determined by second-harmonic generation microscopy relying on linear and radial polarizations.