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Utilizing state-of-the-art TES detector arrays, the SAFARI imaging spectrometer onboard the Japanese SPICA mission will take maximum advantage of a deeply cooled 3m class space telescope, offering the far-infrared astronomical community unprecedented sensitivity, and mapping efficiency, in the 34–210 μm wavelength range filling the gap between JWST and ALMA.
With the introduction of new mobile devices and new multimedia services working in wireless environments in the middle of 2000s, there has been abrupt change in how to consume multimedia services, resulting in the great impact on the related industries in last decade. Users are consuming much more digital information and many more services in wireless environment. Popularity of mobile digital devices...
We report our recent work to improve a number of performance attributes of “KIDcam,” a passive THz imaging camera based on frequency multiplexed Lumped Element Kinetic Inductance Detectors (LEKIDs.) The array operates at 250mK but the entire instrument is liquid cryogen-free and can be operated remotely and automatically. It offers high sensitivity throughout the THz region with video rate frame capture...
We discuss some recent astronomical results from the Herschel Space Observatory, and indicate future directions for astronomy and astrophysics enabled by submillimeter/far-infrared observations. A huge amount remains to be done, but it will require improved ground-based, suborbital, and space facilities. New technology enabling large format detectors of different types is also needed. Efforts underway...
A calorimetric power meter has been developed for the highly accurate power measurement of terahertz spatial light. A solid-state terahertz absorber is used when constant terahertz wave absorption occurs due to the dielectric loss of the absorber and the sensor frequency sensitivity can be calibrated by measuring the reflectance characteristics of the absorber in the terahertz region. The stable absorption...
A terahertz detector using an InAlAs/InGaAs high-electron-mobility-transistor (HEMT) integrated with a bow-tie antenna was proposed and fabricated. By utilizing ballistic transport in the short-channel, a current sensitivity of 1.5 A/W at 280 GHz was achieved by the detector having 70-nm T-gate HEMT without applying drain bias. We also measured the drain bias dependence of current sensitivity on the...
Large area THz video-rate imaging is demonstrated using a 0.1 Megapixel THz camera having a 17 degree Field of View and 50 Hz frame rate. Active THz see-through imaging has been performed where the THz laser beam has been expanded using a series of custom lenses. Owing to the quality of the beam expansion set-up and good sensitivity of the IRXCAM-THz-384 camera, high quality, large area THz images...
This paper reports the design, fabrication, and characterization of a suite of dielectric probes for near-field and evanescent microfluidic sensing applications. Four different probe designs are studied. These structures are made from cylindrical alumina dielectric rods, and were integrated with microfluidic channels. Mixtures of two different solvents were used to characterize the probes. The sensitivity...
Sub-5-fs laser pulses and a photoconductive antenna are used to detect the frequency of continuous wave terahertz light sources at 0.1 and 0.6 THz. Both the frequency mixing in a photoconductive antenna and the heterodyne detection at the sub-harmonic mixer can detect the signals of the light source. By slightly changing the frequency of the light source, absolute frequency can be evaluated directly.
This paper reports on the design and performance of a terahertz (THz) linear camera with 50 pW/√Hz noise-equivalent power (NEP). This camera is sensitive to four bands of vertically and horizontally polarized THz radiation (0.22, 0.32, 0.42, and 0.52 THz). The heart of the camera is a diode-based focal plane array (FPA) that has a 10 nV thermal noise level and 1–2 kV/W sensitivity across the four...
Sensitivity of microbolometer Terahertz (THz) focal plane array (FPA) is improved by one order of magnitude at 0.5–0.6 THz, comparing with the previous THz-FPA. This is achieved by modifying an optical cavity structure in a pixel, such that the optical cavity length is extended by a factor of 4–5 than that of the previous structure. Minimum detectable powers (MDPs) per pixel are measured at 4.3, 2...
Electromagnetic modeling predicts that dielectric substrate windows placed above a tissue of interest alter the hydration sensitivity of reflective THz imaging systems. Furthermore, interference effects between layers (the window with the skin layers) cause the window's optical path length to change the depth probed by the imaging system. A pulsed THz imaging system operating at ∼ 500 GHz was used...
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