Mind the Gap Near-field microscopy has benefited from subwavelength near-field plasmonic probes that make use of field-concentrating properties gaps. These achieve maximum enhancement only in tip-substrate gap mode, which can yield large signals, but for a metallic substrate and very small distances. Bao et al. (p. 1317 ) designed probe unites broadband field confinement with bidirectional coupling between far-field electromagnetic energy. Their tips primarily rely on internal modes tip...

The authors present a technique that allows to modify the local characteristics of two-dimensional photonic crystals by controlled microinfiltration liquids. They demonstrate experimentally addressing and infiltrating each pore with simple liquid, e.g., water, it is possible write pixel optical devices any geometry shape. Calculations confirm obtained structures indeed constitute desired resonators waveguide structures.

We report on the observation of Anderson localization near-visible light in two-dimensional systems. Our structures consist planar waveguides which disorder is introduced by randomly placing pores with controlled diameter and density. show how to design can be observed describe both realization materials actual localized modes near-field scanning microscopy.

Abstract Disordered photonic nanostructures have attracted tremendous interest in the past three decades, not only due to fascinating and complex physics of light transport random media, but also for peculiar functionalities a wealth interesting applications. Recently, dielectric disordered systems has received new inputs by exploiting role long‐range correlation within scatterer configurations. Hyperuniform materials, that share features crystals systems, constitute archetype where can be...

Microcavities and nanoresonators are characterized by their quality factors (Q) mode volumes (V ).While Q is unambiguously defined, there still questions on V and, in particular, its complex-valued character, whose imaginary part linked to the non-Hermitian nature of open systems.Helped cavity perturbation theory near-field experimental data, we clarify physics captured show how a mapping spatial distribution both real parts can be directly inferred from measurements.This result shows that...

Photonic and plasmonic devices rely on nanoscale control of the local density optical states (LDOS) in dielectric metallic environments. The tremendous progress designing tailoring electric LDOS nano-resonators requires an investigation tool that is able to access detailed features localized resonant modes with deep-subwavelength spatial resolution. This scenario has motivated development different imaging techniques. Here, we prove a technique involving combination scanning near-field...

Materials featuring anomalous suppression of density fluctuations over large length scales are emerging systems known as disordered hyperuniform. The underlying hidden order renders them appealing for several applications, such light management and topologically protected electronic states. These applications require scalable fabrication, which is hard to achieve with available top-down approaches. Theoretically, it that spinodal decomposition can lead hyperuniform architectures. Spontaneous...

Hyperuniform disordered photonic materials have recently been shown to display large, complete band gaps and isotropic optical properties, are emerging as strong candidates for a plethora of optoelectronic applications, making them competitive with many their periodic quasiperiodic counterparts. In this work, high quality factor cavities in hyperuniform architectures fabricated through semiconductor slabs experimentally addressed by scanning near-field microscopy. The wide range confined...

Spatially resolved photoluminescence spectra of a single quantum well are recorded by near-field spectroscopy. A set over four hundred displaying sharp emission lines from localized excitons is subject to statistical analysis the two-energy autocorrelation function. An accurate comparison with theory exciton center-of-mass motion in two-dimensional spatially correlated disordered potential reveals clear signatures mechanical energy level repulsion, giving spatial and energetic correlations systems.

We experimentally observe a sizable and reversible spectral tuning of the resonances two-dimensional photonic crystal microcavity induced by introduction subwavelength size glass tip. The comparison between experimental near-field data, collected with $\ensuremath{\lambda}∕6$ spatial resolution, results numerical calculations shows that shift tip is proportional to local electric field intensity cavity mode. This observation proves electromagnetic density states in can be directly measured...

We demonstrate the nonresonant magnetic interaction at optical frequencies between a photonic crystal microcavity and metallized near-field microscopy probe. This can be used to map control component of modes. The metal coated tip acts as microscopic conductive ring, which induces response opposite inducing field. resulting shift in resonance frequency measure distribution field intensity structure fine-tune its via components.

The optical behavior of coupled systems, in which the breaking parity and time-reversal symmetry occurs, is drawing increasing attention to address physics exceptional point singularity, i.e., when real imaginary parts normal-mode eigenfrequencies coincide. At this stage, fascinating phenomena are predicted, including electromagnetic-induced transparency phase transitions. To experimentally observe points, near-field coupling waveguide proposed so far was proved work only peculiar cases....

We demonstrate efficient anti reflection coatings based on adiabatic index matching obtained via nano-imprint lithography. They exhibit high total transmission, achromaticity (99.5% < T 99.8% from 390 to 900 nm and 99% 99.5% 800 1600 nm) wide angular acceptance (T > up 50 degrees). Our devices show laser-induced damage thresholds in the sub-picosecond (>5 J/cm2 at 1030 nm, 500 fs), nanosecond (>150 1064 12 ns >100 532 ns) regimes, low absorption CW regime (<1.3 ppm 1080 nm), close those of...

Dewetted, SiGe nanoparticles have been successfully exploited for light management in the visible and near-infrared, although their scattering properties so far only qualitatively studied. Here, we demonstrate that Mie resonances sustained by a SiGe-based nanoantenna under tilted illumination, can generate radiation patterns different directions. We introduce novel dark-field microscopy setup exploits movement of objective lens to spectrally isolate contribution total cross-section during...

We report by means of near-field microscopy on the coupling between two adjacent photonic crystal microcavities. Clear-cut experimental evidence spatial delocalization coupled-cavity optical modes is obtained imaging electromagnetic local density states. also demonstrate that it possible to design structures with selective different having orthogonal extensions

We employ a far-field analysis of the angular emission pattern to experimentally assess symmetry localized modes in coupled photonic-crystal cavities. demonstrate that spatial distribution nanocavities may change from bonding an antibonding orbital, feature is unusual quantum mechanical systems. Experimental data are confirmed by numerical calculations and interpreted terms peculiar oscillatory behavior evanescent waves band gaps.

Necklace states arise from the coupling of otherwise confined modes in disordered photonic systems and open high transmission channels strongly scattering media. Despite their potential relevance transport properties systems, necklace state statistical occurrence dimensions higher than one is hard to measure, because lack a decisive signature. In this work we provide an efficient method tell apart single measurement coupled mode localized complex problem, exploiting analogy with...

Two-dimensional near-field images of light transmitted through a disordered dielectric structure have been measured for two probe wavelengths. From these data, the 2D spatial dependence intensity correlation function, C(deltaR-->), has extracted. We observe that C is dominated by rapidly varying feature determined wavelength and average refractive index material, as expected theory. Finally, we deduce absolute value effective fitting theoretical to our experimental results.

We present a spectral tuning mechanism of photonic crystal microcavities based on microfluidics. The microinfiltration with water one or few cavity holes and its subsequent controlled evaporation allow us to tune the resonances in range larger than 20 nm, subnanometer accuracy, we also observe that addition microcavity region improves quality factor Q.

We report on polarization sensitive imaging of two-dimensional photonic crystal microcavity modes. By using a near-field scanning optical microscope with setup, it is possible to selectively map, resolution beyond the diffraction limit, each electric field component in plane sample. In addition, simultaneous analysis photoluminescence maps different channels allowed us obtain important insight microscopy detection mechanism. Finite difference time domain simulations confirm experimental results.

A method to achieve photoinduced tuning of PhC nanocavity modes is discussed and implemented. It based on light induced oxidation in air atmosphere with very low thermal budget which produces a local reduction the GaAs membrane effective thickness large blueshift modes. also shown that green much more efficient inducing micro-oxidation respect near infrared light. The observed behaviour attributed oxide growth promoted by photoenhanced reactivity.

We present experimental evidence for the different mechanisms driving fluctuations of local density states (LDOS) in disordered photonic systems. establish a clear link between microscopic structure material and frequency correlation function LDOS accessed by near-field hyperspectral imaging technique. show, particular, that short- long-range correlations are controlled physical processes (multiple or single scattering processes, respectively) can be—to some extent—manipulated independently....

Many of the most advanced applications semiconductor quantum dots (QDs) in information technology require a fine control QDs' position and confinement potential, which cannot be achieved with conventional growth techniques. Here, novel versatile approach for fabrication site-controlled QDs is presented. Hydrogen incorporation GaAsN results formation N-2H N-2H-H complexes, neutralize all effects N on GaAs, including N-induced large reduction bandgap energy. Starting from fully hydrogenated...