Liquid crystal (LC) is an amazing class of electro-optic media; its applications span from visible to infrared, millimeter wave, and terahertz regions. In the visible and short-wavelength infrared (SWIR) regions, most LCs are highly transparent. However, to extend the electro-optic application of LCs into MWIR and LWIR, several key technical challenges have to be overcome: (1) low absorption lo...

Recent research demonstrated that gas leaking fromunderground can be identified by observing increased stress in overlying vegetation using spectral imaging. This has been accomplishedwith both visible/near-infrared (Vis/NIR) sunlight reflection and long-wave infrared (LWIR) thermal emission. During a 4-week period in summer 2011, a controlled release experiment was conducted in Bozeman, Montan...

We describe the development and testing of hollow core glass waveguides (i.e., fiber optics) for use in Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) spectroscopy systems. Spectroscopy measurements in these wavelength regions (i.e., from 3 to 14 μm) are useful for detecting trace chemical compounds for a variety of security and defense related applications, and fiber optics are a key e...

This paper presents a proof-of-concept for microelectromechanical system (MEMS)-based fixed cavity Fabry–Pérot interferometers (FPIs) operating in the long-wavelength infrared (LWIR, 8 to 12 μm) region. work reports first time on use of low-index BaF2 thin films combination with Ge high-index such applications. Extremely flat and stress-free ∼3-μm-thick free-standing distributed Bragg reflector...

Graphene has attracted great interest for integrated photonic platforms in the long-wave infrared (LWIR) spectroscopic and polarimetric sensing due to capability of on-chip integration, fast response, broadband operation. However, graphene suffers from low photoresponsivity thus poor performance weak absorption. Polarization detection using is hindered by its small in-plane anisotropy. Here, na...

Infrared (IR) radiation detectors are used in numerous applications from thermal imaging to spectroscopic gas sensing. Obtaining high speed and sensitivity, low-power operation cost-effectiveness with a single technology remains be challenge the field of IR sensors. By combining nano-thermoelectric transduction nanomembrane photonic absorbers, we demonstrate uncooled bolometer that is material-...

1. SUMMARY: Physical Sciences Inc. (PSI), in conjunction with its subcontractor, VTech Engineering Corp., developed an ultra low noise receiver module (RM) for direct detection LWIR LIDAR systems. The receiver module is compatible with emerging LWIR source technologies, e.g., optical parametric amplifier-based sources, as well as existing frequency-agile CO2 laser technology. In this paper we p...

Registration of long-wave infrared (LWIR) hyperspectral images with their thermal and emissivity components has until now received comparatively less attention respect to the visible near short wave images. In this paper, registration LWIR is investigated enhance applications such as change detection, temperature separation, target detection. The proposed approach first searches for best featur...