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Atacama Large Millimeter Array (ALMA) is an interferometer in Atacama desert in Chile at altitude of 5 km, which is now in a final stage of construction. This array consists of 12-m and 7-m diameter antennas with base line up to 16 km. Each antenna will be equipped with a state of art heterodyne receivers covering atmospheric windows in the range of 30 to 950 GHz. The design of current generation...
A polarization sensitive millimeter-wave sensor operating at 77 GHz is built and characterized. The sensor is scalable to a distributed aperture architecture and results are presented from using multiple antennas. Imagery is also presented from a 30-element distributed aperture system that is only sensitive to one polarization.
Metal-coated polymers shaped by 3D stereolithography are introduced as a new manufacturing method for passive components for millimeter to terahertz electromagnetic waves. This concept offers increased design capabilities and flexibilities while shortening the manufacturing process of complex shapes. Tests in the W-band are reported.
We report the measured performance characteristics of a broadband (0.2 – 10 THz) bolometer instrument based on thin film superconducting technology. The technology is designed for operation both in liquid helium cryostats but also in an electrical cooling platform. We report a number of significant advantages that accrue to superconducting technology compared to semiconductor devices. Single pixel...
We have controlled the curvature of silicon microlens by changing the amount of photoresist in order to microfabricate hemispherical silicon microlens which can improve the directivity and reduce substrate mode losses.
An experimental investigation of the transport mechanism through a wire medium in the THz regime is performed. Such a 3D arrangement of subwavelength-spaced metal wires captures an electric field distribution at its front interface and transmits it to the backside without distortion. In order to understand the underlying canalization effect and its basic transport mechanism we measured the transmitted...
MKIDs are cryogenic (<1K) detectors suitable for a broad range of wavelengths and combine a high sensitivity with an intrinsic high-multiplexing capability. We plan to use the knowledge acquired in the development of MKIDs to develop a passive stand-off terahertz imager for specialized security and biomedical applications. The imager will comprise of several subcomponents, such as the focal-plane...
The electromagnetic scattering properties of planar slotted waveguide array antennas in terahertz regime are investigated. A hybrid technique of the method of moments and physical optics solution is used to calculate the mode and structural scattering field. The simulation results indicate that the antenna's radar cross section is closely related to the incident wave frequency, angle and polarization.
We present our recent development of high-temperature superconducting (HTS) Josephson terahertz (THz) detector arrays for imaging. The device is made of 10 Au thin-film antennae-coupled YBa2Cu3Ox−7 step-edge Josephson junction detectors. The design and characterization of the THz detector array, the development of multi-channel biasing and read-out electronics, and the system integration will be described.
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