The problem of designing nonpolarizing beam splitters with as broad a spectral band as practical has not been clearly understood. The effort of the work reported here has been to glean understanding from the various results of a contest for such designs and further studies of what might be the underlying principles and behaviors that are involved in such designs. A few key layer patterns have b...

In situ optical reflectometry at the wavelength of 488 nm was employed to control the growth of MgZnSSe/ZnSSe Bragg mirror stacks for the blue-green spectral region. 10and 20-period layer structures of MgZnSSe/ZnSSe were grown on GaAs ~100! epilayers by molecular beam epitaxy. A room-temperature peak reflectance of 86% was obtained for the 20-period structure at the central wavelength of 474 nm...

Metasurfaces with local phase tuning by subwavelength elements promise unprecedented possibilities for ultrathin and multifunctional optical devices in which geometric design is widely used due to its resonant-free large tolerance fabrications. By arranging the orientations of anisotropic nanoantennas, phase-based metasurfaces can convert incident spin light orthogonal state, enable flexible wa...

An adaptive-passive quarter-wave tube resonator silencer was experimentally tested using recorded in-duct reciprocating engine exhaust noise. The exhaust noise was re-played through a loudspeaker attached to one end of a duct, and the adaptive passive system was able to track changes in engine speed and provide attenuation of the noise at the fundamental firing frequency of the engine and the t...

– In this paper the operation behavior of three-way Doherty amplifier is analyzed, including the efficiency and linearity. Amplifier is designed in the configuration with two quarter-wave impedance transformers in the output combining circuit with LDMOSFETs in carrier and peaking amplifies. The signals for linearization (the fundamental signals’ second harmonics-IM2 and fourth-order nonlinear s...