We experimentally demonstrate optical rotation and manipulation of microscopic particles by use vortex beams with fractional topological charges, namely beams, which are coupled in an tweezers system. Like the integer also capable rotating induced transfer orbital angular momentum. However, unique radial opening (low-intensity gap) intensity ring encompassing dark core, due to nature beam, hinders significantly. The beam's momentum exploited guide transport particles.

The silicon thermo-optic switch (TOS) is one of the most fundamental and crucial blocks in large-scale photonic integrated circuits (PICs). An energy-efficient TOS with ultrahigh extinction ratio can effectively mitigate cross talk reduce power consumption optical systems. In this Letter, we demonstrate a based on cascading Mach–Zehnder interferometers (MZIs) spiral phase shifters. experimental results show that an 58.8 dB obtained, switching as low 2.32 mW/π without air trench. rise time...

It is shown experimentally for small spectral bandwidth that spiral phase plates (SPPs) can generate optical vortices in femtosecond beams without the need additional dispersion compensation elements. An autocorrelation measurement performed on obtained vortex (OV) beam showed SPP did not significantly change pulse duration. Hence single element SPP, already an established shaping technique continuous wave and high power regimes, presented as efficient practical means to obtain OVs are free...

The influence of space-charge effects on the nature and extent intensity-dependent temporal broadening in picosecond subpicosecond streak images has been investigated analytically. results indicate that limitations dynamic range electron-optical cameras result primarily from which are most serious regions tubes where photoelectrons travel with low velocities for relatively long times. predicted values have found to be reasonable agreement experimental measurements Photochron I II cameras....

This paper describes a low-cost soft-lithography method for building large-numerical-aperture microlenses in hybrid sol-gel glass. The fabrication processes comprise three steps, namely of large numerical aperture microlens array photoresist as master, replication the master poly-dimethylsiloxane (PDMS) elastomeric molds and reproduction PDMS replica onto glass an end structure. Comparing with direct UV photosensitive glass, proposed provides unique advantage terms freedom shape thickness...

We demonstrate a fabrication technique in the realization of microaxicon by single-step processing via electron-beam lithography. Microaxicon is used for generation propagation-invariant Bessel beams which find tremendous applications optical trapping. The proposed simple, reliable, and reproducible method production high-quality with long distances, our configuration, excess 20cm. Such nondiffracting distances are essential tweezers systems many cases.

Optical switching delay line (OSDL) is a structure consisting of cascaded optical switches and waveguides with different lengths. Different propagation paths can be selected to obtain the desired by controlling in their "through" or "cross" states. Because its high accuracy, large bandwidth effective control, OSDL has become one key components microwave photonic beamforming system. However, calibrations states all are necessary due fabrication errors before used real applications. At...

We present a deterministic method to generate modified helical beams which create optical vortices with desired dark core intensity patterns in the far-field. The experiments are implemented and verified by spatial light modulator (SLM), imprints phase function onto incident wavefront of TEM00 laser mode transform beam into beam. can be calculated once specific shape an vortex is required. exploited manipulation verification its orbital angular momentum experimentally.

The integrated optical delay line plays a crucial role in microwave photonic chips. Continuous tunability is growing trend filtering and beamforming techniques of photonics. Based on the silicon platform, we present experimentally demonstrate an continuously tunable (OTDL) chip, which contains 4-bit switched (OSDL) thermally based grating-assisted Contradirectional coupler (CDC). OSDL can achieve stepwise delays, while CDC introduced to improve tuning resolution within one step OSDL....

In this work, we present a wideband 1 × 4 continuously tunable microwave photonic beamforming chip based on integrated optical switching delay lines (OSDLs) cascade with properly designed asymmetry Mach-Zehnder interferometer (AMZI). Simulation and experiment were conducted to achieve over 25 GHz bandwidth (0 ps ∼ 3.54 ps), which can sufficiently cover 5-bit silicon OSDL's discrete step (3.54 ps). Simulations also carried out. Additionally, enhance the compactness of chip, introduce...

Nanofluidic channel arrays, which have a width of about 40 nm, depth 60 nm and length 50 μm, were created using focused-ion-beam milling instrument on silicon nitride film swiftly exactly, as is necessary. Stained λ-DNA molecules put inside these sub-100 conduits by capillary force they stretched transferred along conduits, dealt with activating reagent Brij aqueous solution in advance. The movements DNA channels discussed. These nano-structure may be useful the study analysis statics well...

In this letter, we report multiple-channel longitudinal optical guiding of microparticles using an array Bessel beams generated from a composite hologram fabricated by ultraviolet lithography. The efficiency each beam in the is investigated experimentally. rod-like core beam, with its nondiffracting and self-reconstruction property, has been shown to offer strong capability for along propagation axis possibly even multiple-microfluidic channels massively.

A picosecond digitally-restored image-dissected framing method involving a conventional streak camera and new computer software is described. The preliminary result gave 5 frames with an exposure time of 13 ps spatial resolutions 2 1p/mm on the screen 6 photocathode. speed 7.7×1010 frames/s for frame sizes 15×15 mm has been demonstrated.

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation C. H. Chen, Niu, D. Yan, Hsieh, P. Lee, Chi; Ferromagnetic GeMn thin film prepared by ion implantation beam induced epitaxial crystallization annealing. Appl. Phys. Lett. 11 June 2012; 100 (24): 242412. https://doi.org/10.1063/1.4729752 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...

In our specially designed femtosecond streak image tube, the electron beam was focused by a cylindrical optical lens. order to achieve temporal resolution of less than 50fs and large dynamic range, electric field near photocathode 6-8kV/mm with slit acceleration electrode. The dispersion in lens has been eliminated completely optimization focusing To compensate arising from accelerating electrode, compensation element half open aperture have introduced, so that total achieved. overcome...

The authors propose a low-pass 2f spatial filter for improving optical vortex beams in terms of circular geometry generated by microfabricated wedge free space. Compared with conventional wedge, they are able to realize high-quality Q value close 1 free-space propagation. Physical mechanism behind the technique is found that it removes diffraction artifacts as well higher frequency components quasivortex based on and hence filtered beam reconstructed minimized distortions.

We perform a time-dependent analysis of the formation and stable propagation an ultraslow optical soliton pair, four-wave mixing (FWM) via tunable Fano interference in double-cascade type semiconductor multiple quantum wells (SMQWs). By using probability amplitude method to describe interaction system, we demonstrate that electromagnetically induced transparency (EIT) can be controlled by linear case strength has important effect on group velocity pair nonlinear case. Then, when signal field...