Subwavelength spinning of particles in vector cosine-Gaussian field with radial polarization

A new type of radially polarized (RP) cosine-Gaussian (CG) field is proposed. Through the analytical model, it is found that such RP CG beam exhibits completely different focusing properties from the reported RP plane waves. More importantly, a stable three-dimensional trap of Rayleigh particle accompanied by a subwavelength spin motion can...

Nonlinearity-modulated single molecule trapping and Raman scattering analysis

Single molecule detection and analysis play important roles in many current biomedical researches. The deep-nanoscale hotspots, being excited and confined in a plasmonic nanocavity, make it possible to simultaneously enhance the nonlinear light-matter interactions and molecular Raman scattering for label-free detections. Here, we...

Dual Coaxial Longitudinal Polarization Vortex Structures

Carrying orbital angular momentum per photon, the optical vortex has elicited widespread interest. Here, we demonstrate that dual coaxial longitudinal polarization vortices can appear upon a nonparaxial propagation of a tightly focused Pancharatnam-Berry tailored Laguerre-Gaussian beam. Most importantly, it is capable of accessing arbitrary...

Pancharatnam–Berry phase shaping for control of the transverse enhancement of focusing

We show that elongating a tightly focused field in the direction perpendicular to the optical axis is possible. We demonstrate our approach by specially shaping the Pancharatnam–Berry (PB) phase. Moreover, the analytical formulae required to calculate the strength vectors and energy flux of the three-dimensional electromagnetic fields near...

Fully controlled photonic spin in highly confined optical field

As an intrinsic attribute of light, the spin angular momentum (SAM) of photons has aroused considerable attention because of the fascinating properties emerging from light–matter interactions. We show that a diffraction-limited focal field with a steerable photonic spin structure in three dimensions can be produced under a 4π microscopic...

Angular momentum properties of hybrid cylindrical vector vortex beams in tightly focused optical systems

Optical angular momenta (AM) have attracted tremendous research interest in recent years. In this paper we theoretically investigate the electromagnetic field and angular momentum properties of tightly focused arbitrary cylindrical vortex vector (CVV) input beams. An absorptive particle is placed in focused CVV fields to analyze the optical...

A plasmonic spanner for metal particle manipulation

Typically, metal particles are difficult to manipulate with conventional optical vortex (OV) tweezers, because of their strong absorption and scattering. However, it has been shown that the vortex field of surface plasmonic polaritons, called plasmonic vortex (PV), is capable of stable trapping and dynamic rotation of metal particles, especially...

Dynamic plasmonic beam shaping by vector beams with arbitrary locally linear polarization states

Vector beams, which have space-variant state of polarization (SOP) comparing with scalar beams with spatially homogeneous SOP, are used to manipulate surface plasmon polarizations (SPPs). We find that the excitation, orientation, and distribution of the focused SPPs excited in a high numerical aperture microscopic configuration highly depend on...

User Needs in Green ITS: Results of a Questionnaire Survey and Proposal for Green ITS Design

An internet survey has been conducted among drivers in the Netherlands and Japan to study their attitude towards Green ITS. The survey focuses on driving behavior and ITS experience, attitude towards environment, and Green ITS preferences. The results show that money-related information gives the most effective motivation for drivers to follow...

Carbon nanotube-based superconducting and ferromagnetic hybrid systems

Carbon Nanotubes are molecules with exceptional physical properties that are most useful for applications in the growing field of nanotechnology. In addition, because of its special electrical properties, they are extremely useful for experiments on the fundamental properties of one-dimensional electronic systems. This thesis describes a series...

Spin-dependent quantum interference in single-wall carbon nanotubes with ferromagnetic contacts

Nanospintronics with carbon nanotubes

Sample-specific and ensemble-averaged magnetoconductance of individual single-Wall carbon nanotubes

Vergelijking van extractie- en zuiveringsmethoden voor sediment voor analyse met de Dr. Calux assay

In dit rapport worden de resultaten gepresenteerd van een onderzoek dat tot doel had het in kaart brengen van eventuele verschillen in de DR-Calux respons tussen verschillende extractie- en zuiveringsmethoden van sediment. Drie met dioxine vervuilde baggerspeciemonsters (laag, midden en hoog gecontamineerd) werden in vijfvoud volgens het RIKZ...

Crack-line Green's functions for finite bodies

Crack-line Green's functions are obtained for cracks in various twodimensional configurations. The boundary element method, coupled with a singular field model of the crack tip, has been used to solve the initial elasticity problem. The Green's functions can be used to obtain the stress intensity factors for cracks in arbitrary stress fields...

The growth of fatigue cracks in spar-boom sections

The growth of cracks under constant amplitude sinusoidal fatigue loads was measured for 3L65 aluminium alloy structural specimens in which a crack was initiated in a flange and grew into a larger sectioned boom. Crack growth data in the same material was obtained using centre-notched coupon specimens. These data together with the earl ier crack...

Evolution of a Heave Control System for an Amphibious Hovercraft

A heave control system for amphibious hovercraft has been designed and tested. The central element in the system being an axial flow, lift-fan whose blade angles are continuously varied by means of feedback signals from a pressure transducer located in the front end of the hovercraft cushion and from an accelerometer measuring the heave...