Plasmonic nanoapertures generate strong field gradients enabling efficient optical trapping of nano-objects. However, because the infrared laser used for is also partly absorbed into metal leading to Joule heating, plasmonic nano-optical tweezers face issue local temperature increase. Here, we develop three independent methods based on molecular fluorescence quantify increase induced by a 1064 nm beam focused single and double nanoholes milled in gold films. We show that nanohole can be...

The local environment of Bi and Ti atoms in the lead-free relaxor ferroelectric solid-solution ${({\mathrm{K}}_{x}{\mathrm{Na}}_{1\ensuremath{-}x})}_{0.5}{\mathrm{Bi}}_{0.5}\mathrm{Ti}{\mathrm{O}}_{3}$ has been studied as a function K concentration temperature for $x=0$ end member by x-ray absorption fine structure (XAFS). It is found that much more distorted than determined from conventional diffraction experiments. shortest $\mathrm{Bi}\ensuremath{-}\mathrm{O}$ distances are to be...

Plasmonic nano-tweezers use intense electric field gradients to generate optical forces able trap nano-objects in liquids. However, part of the incident light is absorbed into metal, and a supplementary thermophoretic force acting on nano-object arises from resulting temperature gradient. thus face challenge disentangling intricate contributions forces. Here, we show that commonly added surfactants can unexpectedly impact performance by thermophilic or thermophobic response nano-object....

Single photon sources with high brightness and subnanosecond lifetimes are key components for quantum technologies. Optical nanoantennas can enhance the emission properties of single emitters, but this approach requires accurate nanoscale positioning source at plasmonic hotspot. Here, we use to simultaneously trap colloidal dots their photoluminescence. The nano-optical trapping automatically locates emitter nanoantenna hotspot without further processing. Our dedicated design achieves a...

In this paper, we describe the implementation of leakage radiation microscopy to probe chirality plasmonic nanostructures. We demonstrate experimentally spin-driven directional coupling as well vortex generation surface plasmon polaritons (SPPs) by nanostructures built with T-shaped and Λ-shaped apertures. Using far-field method, quantitative inspections, including directivity extinction ratio measurements, are achieved via polarization analysis in both image Fourier planes. To support our...

We report high-pressure Raman measurements up to 20.2 GPa on the perovskite-type oxide (Na1/2Bi1/2)0.89Ba0.11TiO3 (NBT–BT0.11), which is of interest as a potential lead-free piezoelectric material. Distinct changes spectra with increasing pressure illustrate that NBT–BT0.11 shows at least two phase transitions. First, application low progressively reduces tetragonal signature in and leads around 1.8 spectrum reminiscent rhombohedral NBT. Second, further increase pressure, pressure-dependent...

A cathodoluminescence-based, contactless method for extracting the bulk minority carrier diffusion length and reduced recombination velocity of an individual grain boundary is applied to vapor grown CdTe epitaxial films. The measured was within range 0.4–0.6 μm varied from 500 750 cm/s. technique can be used investigate effect boundaries on photovoltaic performance.

The gold adhesion layer can have a dramatic impact on the thermal response of plasmonic structures, offering new ways to promote or avoid temperature increase in plasmonics.

Metasurfaces exploiting optical spin Hall effects present an efficient means to control light, and suggest new functionalities in integrated optics. The authors show that array of metallic nanoantennas can be used not only tailor the polarization light extracted from a waveguide with direction wave, but also number output directions their polarizations. This general approach extended various frequencies applied other systems like silicon waveguides or photonic platforms, could building block...

Transmission and scanning electron microscopy were used to examine the growth of gallium nitride (GaN) on polycrystalline diamond substrates grown by metalorganic vapour phase epitaxy with a low-temperature aluminium (AlN) nucleation layer. Growth unmasked was in (0001) orientation threading dislocation densities ≈7 × 109 cm−2. An epitaxial layer overgrowth technique reduce further, depositing silicon stripes surface etching regions down substrate. A re-growth then performed exposed side...

We discuss an alternate paradigm: the chiral electromagnetic local density of states (LDOS) in a spiral plasmonic nanostructure. In both classical and quantum regimes, we reveal using near-field scanning optical microscopy (NSOM) combination with spin analysis that cavity possesses spin-dependent modes. expect this work to lead promising directions for future device development, highlighting potentials chirality information processing.

This article reports the dielectric, conductive, and ferroelectric properties of Rb-doped potassium titanyl phosphate (RKTP) crystals, formula type RbxK1-xTiOPO4, where x=0.0065 or 0.013, both which are shown to undergo switching at room temperature with coercive fields varying from 2.3 2.7 kV/mm. The measured spontaneous polarizations 0.18(±0.01) 0.19(±0.01) Cm-2 for RbxK1−xTiOPO4 x=0.013, respectively. dependence conductivity Rb:KTP on electric-field amplitude high leads distorted...

The morphology and reconstructions of clean CdTe(111)A CdTe(111)B surfaces have been studied by scanning tunneling microscopy. (111)A surface is highly ordered has a (2×2) reconstruction with cadmium vacancy structure. shows large amount disorder small domains having c(8×4) reconstruction. This consists chains atoms in two layer structure sitting upon the bulk terminated surface. These extend any ⟨211⟩ directions. A number other structures were observed, but these showed little long-range...

We study theoretically and experimentally coherent imaging of surface plasmon polaritons using either leakage radiation microscopy through a thin metal film or interference thick film. Using rigorous modal formalism based on scalar Whittaker potentials we develop systematic analytical vectorial method adapted to the analysis involving polaritons. The includes geometrical aberrations due index mismatch which played an important role in interpretation recent experiments microscopy. compare our...

A method is reported to experimentally measure the trap stiffness in double nanohole apertures and optimize design parameters maximize plasmonic trapping performance.

This paper reports the low-temperature dielectric, conducting, and ferroelectric properties of potassium titanyl phosphate, ${\mathrm{KTiOPO}}_{4}$ (KTP). The change dielectric relaxation characteristics as well conducting are related to decrease ion hopping frequency with temperature. Between room temperature 100 K, there four changes in behavior KTP: (i) an increase ${\mathrm{K}}^{+}$ activation energy from $0.25\ifmmode\pm\else\textpm\fi{}0.02\mathrm{eV}$...

This Letter reports the use of an inductively coupled plasma technique for fabrication proton-exchanged (PE) LiNbO3 (LN) waveguides. Planar and stripe waveguides have been formed in Y-cut LN which are difficult to obtain with conventional molten acid method due occurrence surface damage. Secondary ion mass spectrometry, scanning electron microscopy, infrared absorption spectrum characterization results revealed that a uniform vertical PE profile single low order crystal phase has directly...

We report on the reciprocal spin Hall effect of light in T-shaped nanoaperture arrays. Specifically, we demonstrate that information tied to surface plasmons trajectories can be encoded into free-space spin-carrying photons. The functionality system act as a circular polarizer is therefore implemented an interference eraser experiment where device used which-path marker. Complementarity between wave-like and particle-like behavior verified, hence, further demonstrating outlook for...

This paper reports the conductive and ferroelectric properties of RTP crystals that are important for fabrication quasi-phase-matched devices. The frequency dependence conductivity is shown to be represented by a Debye-function in lower range ({<}10 kHz) obey power law high range. spontaneous polarization coercive field found 0.198±0.005 C m-2 2.65±0.2 kV mm-1, respectively, measuring switching current under domain reversal. Ferroelectric hysteresis loops obtained which effects previously...