We show the real-space observation of fast and slow pulses propagating inside a photonic crystal waveguide by time-resolved near-field scanning optical microscopy. Local phase group velocities modes are measured. For specific frequency we observe localized pattern associated with flat band in dispersion diagram. During at least 3 ps, movement this field is hardly discernible: its velocity would be most c/1000. The huge trapping times without use cavity reveal new perspectives for time...

The negatively charged nitrogen-vacancy (NV-) center in diamond has realized new frontiers quantum technology. Here, the center's optical and spin resonances are observed under hydrostatic pressures up to 60 GPa. Our observations motivate powerful techniques measure pressure image high magnetic electric phenomena. further reveal a fundamental inadequacy of current model provide insight into its electronic structure.

Electrically driven single-photon emitting devices have immediate applications in quantum cryptography, computation and metrology. Mature device fabrication protocols the recent observations of single defect systems with functionalities make silicon carbide an ideal material to build such devices. Here, we demonstrate bright diodes. The electrically emitters display fully polarized output, superior photon statistics (with a count rate >300 kHz) stability both continuous pulsed modes, all at...

Room temperature single-photon emission and quantum characterization is reported for isolated defects in zinc oxide. The are observed thin films of both in-house synthesized commercial oxide nanoparticles. Emission spectra the red infrared, second-order photon correlation functions, lifetime measurements, count rates presented. Both two- three-state emitters identified. Sub-band gap absorption suggest these vacancy. These results identify a new source single photons readily available wide...

We utilize the anomalous dispersion of planar photonic crystals near dielectric band edge to control wavelength-dependent propagation light. typically observe an angular swing up 10/spl deg/ as input wavelength is changed from 1290 nm 1310 nm, which signifies 0.5 degree/nm. Such a strong order required for wavelength-division multiplexing systems. This first demonstration "superprism" effect in configuration with small lattice.

Heterogeneous integration of III-V semiconductor compounds on Silicon Insulator wafers is one the key technology for next generation chip optical interconnects.Within this context use photonic crystals lasers represent a disruptive solution in terms footprint, activation energy and ultrafast response.In work, we propose fabricate very compact laser sources integrated with passive silicon waveguide circuitry, taking advantage efficient emission from crystal nanocavities.Such micro often...

The eigenfield distribution and the band structure of a photonic crystal waveguide have been measured with phase-sensitive near-field scanning optical microscope. Bloch modes, which consist more than one spatial frequency, are visualized in waveguide. In structure, multiple Brillouin zones due to zone folding observed, positive negative dispersion is seen. slopes shown correspond phase velocity but group velocity. lateral mode profile for modes separated by reciprocal lattice vector found be...

We show the first experimental demonstration of multiple heterostructure photonic crystal cavities being coupled together to form a chain resonators with up ten cavities. This system allows us engineer group velocity light over wide range. Devices were fabricated using 193 nm deep UV lithography and standard silicon processing technology. Structures analysed both resonator bandstructure theory, we highlight discrepancies arising from subtle imperfections structure.

We show a marked reduction in the emission from nitrogen-vacancy (NV) color centers single crystal diamond due to exposure of hydrogen plasmas ranging 700{\deg}C 1000{\deg}C. Significant fluorescence was observed beneath exposed surface at least 80mm depth after ~10 minutes, and did not recover post-annealing vacuum for seven hours 1100{\deg}C. attribute formation NVH by plasma induced diffusion hydrogen. These results have important implications quantum applications, inform our...

Abstract The negatively-charged nitrogen vacancy (NV − ) center in diamond is of great interest for quantum information processing and key distribution applications due to its highly desirable long coherence times at room temperature. One the challenges their use these involves requirement further optimize lifetime emission properties centers. Our results demonstrate reduction NV centers hence an increase rate, achieved by modifying refractive index environment surrounding nanodiamond (ND)....

We demonstrate the compression of picosecond pulses using large group velocity dispersion available from planar photonic crystal (PhC) coupled cavity waveguides (CCWs). A maximum pulsewidth reduction 40%, 1.91 to 1.17 ps, is achieved, in transmission through an 8-/spl mu/m-long PhC waveguide. The equivalent value >10/sup 6/ times larger than that standard single-mode fiber, at pulse center wavelength 1536 nm. device performance analyzed with aid both two-dimensional (2-D) eigenmode expansion...

We demonstrate the integration of bright, fully polarized single-photon emitters readily created by thermal oxidation cubic silicon carbide (SiC) into microdisk resonators. The resonators are a direct laser beam writing lithography technique that is used to align position resonator preselected single defect. Quality factors as high 1900 measured. show presence whispering gallery modes in emission spectrum defect and an increase detected intensity. experimental work supported numerical...

The integration of two-dimensional III-V InP-based photonic crystal and silicon wire waveguides is achieved through an accurate alignment the two optical levels using mix-and-match deep ultraviolet (DUV)/electron beam lithography. adhesively bonded structures exhibit enhancement light emission at frequencies where low group velocity modes line defect occur. Pulsed laser operation obtained from these room temperature under pumping. coupled out Si waveguide via grating couplers directly to...

We demonstrate a robust templated approach to pattern thin films of chemical vapor deposited nanocrystalline diamond grown from monodispersed nanodiamond (mdND) seeds. The method works on range substrates, and we herein the using silicon, aluminum nitride (AlN), sapphire substrates. Patterns are defined photo- e-beam lithography, which seeded with mdND colloids subsequently introduced into microwave assisted deposition reactor grow patterned films. In this study, investigate various factors...

Imaging of biological matter by using fluorescent nanoparticles (NPs) is becoming a widespread method for in vitro imaging. However, currently there no NP that satisfies all necessary criteria short-term vivo imaging: biocompatibility, biodegradability, photostability, suitable wavelengths absorbance and fluorescence differ from tissue auto-fluorescence, near infrared (NIR) emission. In this paper, we report on the photoluminescent properties magnesium oxide (MgO) NPs meet these criteria....

Summary Statement: A tailored image analysis workflow was applied to quantify cortical organoid health, development, morphology and cellular composition over time. The assessment of viability stem cell-derived models is a complex but essential approach understanding the mechanisms human development disease. Aim: Our study motivated by need for an image-analysis workflow, including high-cell content, high-throughput methods, measure architectural features developing organoids. We assessed...

We have fabricated high-quality planar photonic crystal defect waveguides in InP/InGaAsP material. Using Fourier analysis of the Fabry-Pérot fringes obtained transmission, we derive propagation losses. Values as small 1.8 dB/mm for consisting three rows missing holes (W3) were measured. believe that reduction losses is due to high quality etching carried out using a beam voltage–current ratio regime chemically assisted ion-beam etching.

We report on the continuous-wave operation of a band edge laser at room temperature near 1.55 mum in an InGaAs/InP photonic crystal. A flat dispersion band-edge mode is used for surface normal operation. The crystal slab integrated onto Silicon chip by means Au/In bonding technology, which combines two advantages, efficient heat sinking and broad reflectivity.

Linear and non-linear thermo-optical dynamical regimes were investigated in a photonic crystal cavity. First, we have measured the thermal relaxation time an InP-based nano-cavity with quantum dots presence of optical pumping. The experimental method presented here allows one to obtain dynamics temperature nanocavity based on reflectivity measurements cw probe beam coupled through adiabatically tapered fiber. Characteristic times 1.0+/-0.2 micros 0.9+/-0.2 for heating cooling processes...

We present absolute transmission measurements of coupled cavity waveguides defined within planar photonic crystals. investigate a range types and also vary the spacing between cavities. Modal analysis individual cavities reveals symmetries that determine coupling adjacent Enhanced is demonstrated by modifying crystal lattice. highlight need for correct impedance matching at waveguide input in order to improve transmission.

A method for engineering thin (<100 nm) layers of homoepitaxial diamond containing high quality, spectrally stable, isolated nitrogen-vacancy (NV) centres is reported. The photoluminescence excitation linewidth the engineered NVs are as low 140 MHz, at temperatures below 12 K, while spin properties a level suitable quantum memory and register applications. This methodology NV fabrication an important step toward scalable practical based photonic devices information processing. Detailed facts...

We perform an experimental time-domain mapping of nonlinear pulse propagation through a two-dimensional photonic-crystal waveguide. Our optical gating method allows for the complete reconstruction peculiar behavior in this highly dispersive structure. Temporal soliton formation is accompanied by fast time-scale dynamics within picosecond regime. For high signal powers, photonic waveguide band modified, leading to acceleration propagated pulse.