Performances of THz cameras with enhanced sensitivity in sub-terahertz region

Naoki Oda; Tsutomu Ishi; Seiji Kurashina; Takayuki Sudou; Takao Morimoto; Masaru Miyoshi; Kohei Doi; Hideki Goto; Tokuhito Sasaki; Goro Isoyama; Ryukou Kato; Akinori Irizawa; Keigo Kawase

doi:10.1117/12.2175478

13 May 2015 Performances of THz cameras with enhanced sensitivity in sub-terahertz region

Naoki Oda, Tsutomu Ishi, Seiji Kurashina, Takayuki Sudou, Takao Morimoto, Masaru Miyoshi, Kohei Doi, Hideki Goto, Tokuhito Sasaki, Goro Isoyama, Ryukou Kato, Akinori Irizawa, Keigo Kawase

Author Affiliations +

Proceedings Volume 9483, Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense; 94830S (2015) https://doi.org/10.1117/12.2175478
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

Uncooled microbolometer-type 640x480 and 320x240 Terahertz (THz) focal plane arrays (FPAs) with enhanced sensitivity in sub-THz region are developed, and incorporated into 640x480 and 320x240 cameras, respectively. The pixel in the THz-FPA has such a structure that an area sensitive to electromagnetic wave is suspended above read-out integrated circuit (ROIC). A thin metallic layer is formed on the top of the sensitive area, while a thick metallic layer is formed on the surface of ROIC. The structure composed of the thin metallic layer and the thick metallic layer behaves as an optical cavity. The THz-FPAs reported in this paper have a modified pixel structure which has several times longer optical-cavity length than NEC’s previous pixel does, by forming a thick SiN layer on the ROIC. The extended optical-cavity structure is favorable for detecting electromagnetic wave with lower frequency. Consequently, the Minimum Detectable Power per pixel (MDP) is improved ten times in sub-THz region, especially 0.5-0.6 THz. This paper presents spectral frequency dependences of MDP values for THz-FPA with the modified pixel structure and THz-FPA with the previous pixel structure, using THz free electron laser (FEL) developed by Osaka University. The modification of pixel structure extends high sensitivity region to lower frequency region, such as sub-THz region, and the wider spectral coverage of THz camera surely expands its applicability

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Naoki Oda, Tsutomu Ishi, Seiji Kurashina, Takayuki Sudou, Takao Morimoto, Masaru Miyoshi, Kohei Doi, Hideki Goto, Tokuhito Sasaki, Goro Isoyama, Ryukou Kato, Akinori Irizawa, and Keigo Kawase "Performances of THz cameras with enhanced sensitivity in sub-terahertz region", Proc. SPIE 9483, Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense, 94830S (13 May 2015); https://doi.org/10.1117/12.2175478

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