Low-loss spot size converters (SSC) are important elements for coupling photonic integrated circuits to fibres. We have developed a Cl2-based inductively-coupled-plasma process to etch non-selectively InP and photo-resist (PR). This process was then used to transfer a vertically-tapered PR pattern into an InP/InGaAsP structure. The tapered PR pattern was made using a standard optical lithograph...

Fig. 1. Perfusion CT scan showing extensive perfusion defects in the bilateral carotid territories and whole brainstem (arrow). Extensive deficits of cerebral blood flow (CBF) and cerebral blood flow volume (CBV) represent a large ischemic core in the bilateral hemispheres and brainstem. Fig. 2. CT angiogram showing tapered occlusions of both internal carotid arteries and occlusion of the basil...

We report on the status of the Inverse Free Electron Laser accelerator experiment under construction at the UCLA Neptune Laboratory. This experiment will use a 400 GW CO2 laser to accelerate through a tapered undulator an electron beam from 14.5 MeV up to 55 MeV. The scheme proposed is the diffraction dominated IFEL interaction where the Rayleigh range of the laser beam is 3.5 cm, much shorter ...

This paper addresses an important issue of light throughput of a metal-coated tapered tip for scanning near-field microscope (SNOM). Corrugations of the interface between the fiber core and metal coating in the form of parallel grooves of different profiles etched in the core considerably increase the energy throughput. In 2D FDTD simulations in the Cartesian coordinates we calculate near-field...

We present a broadband optical parametric amplifier design using tapered gain and tandem chirped quasi-phase-matching gratings to obtain flat gain and group-delay spectra suitable for applications such as ultrashort-pulse amplification and fiber-optic communication systems. Although a tapered-gain amplifier consisting of a single chirped grating can provide constant gain over a wide frequency r...

This paper investigates important problems involved in the design of a CML buffer as well as a chain of tapered CML buffers. A new design procedure to systematically design a chain of tapered CML buffers is proposed. The differential architecture of a CML buffer makes it functionally robust in the presence of environmental noise sources (e.g., crosstalk, power/ground noise). The circuit design ...

We present a double-clad fiber coupler (DCFC) for use in confocal endomicroscopy to reduce speckle contrast, increase signal collection while preserving optical sectioning. The DCFC is made by incorporating a double-clad tapered fiber (DCTF) to a fused-tapered DCFC for achromatic transmission (from 1265 nm to 1325 nm) of > 95% illumination light trough the single mode (SM) core and collection o...

background. orthodontic mini-implants provide skeletal anchorage for tooth movement. there are two designs of mini-implants, tapered and cylindrical, which exhibit different clinical characteristics, including possible micro-damage to cor-tical bone. complications such as peri-implantitis and pain after mini-implant placement are common. the aim of this study was to evaluate the effect of mini-...

background: faculty members are the main sources of universities. determination and promotion of their competencies lead to the overall performance promotion of universities. faculty members’ teaching competencies have the greatest role in the improvement of education, research and universities social services quality. therefore, in order to investigate this issue more carefully, this study aim...

We present five kinds of labyrinthine or space-coiling acoustic metamaterials with tapered channels and apertures. These designs exhibit negative index behavior with modest dispersion, and also have substantially improved impedance matching compared to previously investigated labyrinthine cells. Experimentally measured effective material parameters are in good agreement with numerically compute...