In severe low-visibility environments full of smoke, because the performance degeneration near-infrared (NIR) collimation system quantum drones communication networks, improved dual-threshold method based on trend line analysis for long-wave infrared (LWIR) cascade lasers (QCLs) is proposed, to achieve target acquisition. The simulation results show that smoke-scattering noise a steeply varying...

We describe a design methodology for synthesizing cubic-phase optical elements using two-dimensional subwavelength microstructures. We combined a numerical and experimental approach to demonstrate that by spatially varying the geometric properties of binary subwavelength gratings it is possible to produce a diffractive element with a cubic-phase profile. A test element was designed and fabricat...

We designed, fabricated and characterized a flat multi-level diffractive lens (MDL) comprised of only silicon with diameter = 15.2mm, focal length 19mm, operating over the longwave infrared (LWIR) spectrum 8um to 14um. experimentally demonstrated field view 46deg, depth focus >7mm wavelength-averaged Strehl ratio 0.46. All these metrics were comparable those conventional refractive lens. The ac...

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Long-wave infrared (LWIR) photodetection is of high technological importance, having a wide range applications that include thermal imaging and spectroscopy. Two-dimensional (2D) noble-transition-metal dichalcogenides, platinum diselenide (PtSe2) in particular, have recently shown great promise for detection. However, previous studies mainly focused on wavelengths up to the short-wave region. I...

Infrared imagers are important for reorganization and monitoring. This paper discusses the design of an infrared imager. Optical design in medium wavelength infrared (MWIR) and long wavelength infrared (LWIR) bands is different and needs distinct detectors and materials. Reflective systems are not suitable due to their small field of view (FOV) and vignetting. Refractive dual band optical syste...

The performance of long-wave infrared (LWIR) quantum well (QWIP) detection systems is seriously affected by the dark current detectors. Tiny variations in focal-plane temperature devices cause fluctuations current, which turn generate temporal noise. It difficult to measure accurately after detector assembly packaged. To address above problems, a QWIP measurement method based on proposed, as re...