In this work, we study the behavior of elliptical reflectors in nanophotonic integrated circuits in the context of two-dimensional multimode Gaussian beam. We show that the transformation of the beam profile at the input/output waveguide mouths, and the transformation of the beam profile at the reflector can be described in terms of 2D Hermite-Gaussian (HG) beam modes under first order approxim...

In this paper, radiation pressure induced deformation of a series of thin aluminum reflectors is analyzed theoretically and experimentally. Theory of quantummechanics andmaterialmechanics are applied in 2D simulations and exhibits good coordinationwith experiment results. The original laser source used in the experiment is Gauss-distributed and has been shaped and expanded, resulting in theflat...

The molecular beam epitaxy growth of AlAsSb/Al 0.04 Ga 0.96 AsSb distributed Bragg reflectors lattice-matched to InP is studied. The fabrication and characterization of two such reflectors are reported. Fine structural and optical properties of these samples are investigated using double crystal X-ray diffraction, scanning electron microscopy and reflectivity measurements. Main device performan...

ABSTRACT Modulating retro-reflectors provide a means for free space optical communication without the need for a laser, telescope or pointer tracker on one end of the link. These systems work by coupling a retro-reflector with an electro-optic shutter. The modulating retro-reflector is then interrogated by a cw laser beam from a conventional optical communications system and returns a modulated...

BACKGROUND Linear-array-based photoacoustic computed tomography (PACT) suffers from a limited view. Circular scanning does increase the detection view angle but is time-consuming. Therefore, it is desirable to increase the detection view angle of linear-array-based PACT without sacrificing imaging speed. METHODS Two planar acoustic reflectors placed at 120 degrees to each other were added to ...

This paper proposes a technique for the design of luminaire reflector shapes from prescribed optical properties (far-field radiance distribution), geometrical constraints and user’s knowledge. This is an important problem in the field of Lighting Engineering, more specifically for Luminaire Design. The reflector’s shape to be found is just a part of a set of pieces called in Lighting Engineerin...

We report on a channel drop filter with a mode gap in the propagating mode of a photonic crystal slab that was fabricated on silicon on an insulator wafer. The results, simulated with the 3-dimensional finite-difference time-domain and plane-wave methods, demonstrated that an index-guiding mode for the line defect waveguide of a photonic crystal slab has a band gap at wave vector k = 0.5 for a ...

In recent years, synthetic aperture radars (SARs) have been used to detect man-made targets and to distinguish them from naturally occurring background. The purpose of this thesis is to assess target classification performance of a SAR-based automatic target recognition (ATR) system starting from a foundation of rigorous, physics-based signal models developed from electromagnetic scattering the...

We investigate here a number of variations of the Para-IRA, which is an Impulse Radiating Antenna configured for parachute delivery. We consider first two scale models of the Para-IRA with aluminum reflectors, and then we consider a full-scale version built from fabric. In the scale models, we first investigate the effect of using a large F/D ratio in an IRA. We then investigate the effect of u...