Abstract-Investigation of radiant millimeter wave/terahertz radiation from low-infrared signature targets

B. Aytaç, Ü. Alkuş,  M. Sivaslıgil,  A. B. Şahin,  H. Altan

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10439/1043903/Investigation-of-radiant-millimeter-wave-terahertz-radiation-from-low-infrared/10.1117/12.2278095.short?SSO=1

Millimeter (mm) and sub-mm wave radiation is increasingly becoming a region of interest as better methods are developed to detect in this wavelength range. The development of sensitive focal plane array (FPA) architectures as well as single pixel scanners has opened up a new field of passive detection and imaging. Spectral signatures of objects, a long standing area of interest in the Short Wave Infrared (SWIR), Mid-Wave (MWIR) and Long Wave-IR (LWIR) bands can now be assessed in the mm-wave/terahertz (THz) region. The advantage is that this form of radiation is not as adversely affected by poor atmospheric conditions compared to other bands. In this study, a preliminary experiment in a laboratory environment is performed to assess the radiance from targets with low infrared signatures in the millimeter wave/terahertz (THz) band (<1 THz). The goal of this approach is to be able to model the experimental results to better understand the mm-wave/THz signature of targets with low observability in the IR bands.

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Abstract-Investigating Glow Discharge Detectors as a Millimeter-Wave/Terahertz Radiation Detection Tool

• N. Alasgarzade, M. A. Nebioğlu, T. Takan, I. U. Uzun-Kaymak, A. B. Sahin, H. Altan

https://link.springer.com/chapter/10.1007/978-94-024-1093-8_21

Compared to other forms of electromagnetic radiation, Terahertz (THz) radiation is considered safe for imaging and detection purposes due to their non-invasive and non-destructive nature. Novel techniques and methods are constantly being evaluated for efficient detection and measurements of THz waves, yet their commercial success is limited due to cost and overall complexity of these systems. Commercially available Glow Discharge Detectors (GDDs) are proven to detect microwave and higher frequency radiation. Although, the plasma generated inside the GDDs enables the detection of the EM radiation, the interaction mechanism is not fully understood. In this study, we investigate various types of GDDs that are commercially available, and characterize their overall behaviour in response to both CW and modulated EM radiation. In addition, the response from various GDDs to the mm-wave/THz radiation are surveyed for the range of 260–380 GHz. Measurements show that response signal at certain frequencies within the range are attenuated suggesting a resonance frequency possibly based on the electrode structure.