We suggest a new type of grating reflector denoted hybrid grating (HG) which shows large reflectivity in a broad wavelength range and has a structure suitable for realizing a vertical cavity laser with ultra-small modal volume. The properties of the grating reflector are investigated numerically and explained. The HG consists of an un-patterned III-V layer and a Si grating. The III-V layer has ...

Reflection energy from a linear reflector comes from an integrant over an aperture often described by the Fresnel zone. Within the Fresnel zone, the diffraction energy constructively builds the reflection energy. This paper uses diffraction theory to explain the reflector edge effect on amplitude and the amplitude variation within the Fresnel zone. Thus, discuss the Fresnel zone effect for AVO ...

Metal nanoparticles have been investigated as an efficient method to enhance the light absorption in thin film solar cell due to the surface plasmonic scattering. In this paper, we studied the light trapping by modifying the common silicon-nanoparticle-dielectric-back reflector structure. We reported the short circuit current (Jsc) enhancement of a two-layer nanoparticle structure, coated with ...

BACKGROUND In firefly light organs, reflector layer is a specialized tissue which is believed to play a key role for increasing the bioluminescence intensity through reflection. However, the nature of this unique tissue remains elusive. In this report, we investigated the role, fine structure and nature of the reflector layer in the light organ of adult Luciola cerata. PRINCIPAL FINDINGS Our ...

Antenna reflector losses may play an important role in the calibration budget for a microwave radiometer. If the losses are small they are difficult to measure by traditional means. However, they can be assessed directly by radiometric means using the sky brighmess temperature as incident radiation. The paper describes how such measurements are carried out as well as a suitable experimental set...

A novel method of squeezing with optical pulses in a fiber ring reflector is demonstrated experimentally. Squeezing of greater than 5 +/- 0.3 dB has been observed. The pump is separated from the squeezed radiation with a fiber ring reflector and can be reused, in principle fully, as the local oscillator. The detection is at low frequencies (35-85 kHz) and is unaffected by guided-acoustic-wave B...

The gravity deformations of the ATCA main reflector, as well as the displacements in the sub-reflector and feed, have been surveyed at a set of elevations by VMS (AT 39.3/109). In this report, I quantify these deformations and displacements and examine their effects on the antenna performance at 90 GHz. I have computed the far-field radiation pattern at each of the survey elevations and the ele...

A novel idea of a realization a Synthetic Aperture Radar (SAR) system combining a reflector antenna with a digital feed array was suggested for the first time in [1]. The new digital beam-forming (DBF) SAR architecture has better overall system performance while being of lower complexity level as compared to the planar antenna based architecture [2]. This innovative idea has driven intensive st...

In this paper, a wireless power transfer system (WPT) with magnetically coupled resonators is studied. The idea to use a reflector to enhance the coupling coefficient and the transfer efficiency is proposed and analyzed. Perfect magnetic conductor (PMC) was used in numerical calculations in order to study the performance of a reflector. In the WPT system we studied, efficiency is increased from...

The height of the unwelded root part in T and X welds whose length exceeds the sound-beam width at the contact point between the sound and the reflector can according to methods known today only be estimated by applying the tandem technique with two ultrasonic transverse probes from one single access area, or two access areas, the latter usually not possible in practice. However, with sheets ha...