Microbolometer Terahertz Focal Plane Array and Camera with Improved Sensitivity in the Sub-Terahertz Region

Oda, Naoki; Kurashina, Seiji; Miyoshi, Motosuke; Doi, Kunio; Ishi, Tsutomu; Sudou, Takayuki; Morimoto, T.; Goto, Hideki; Sasaki, Tokuhito

doi:10.1007/s10762-015-0184-2

Cited by 46 publications

(31 citation statements)

References 24 publications

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“…4(a) and (b)). This value should be enough to develop the super-resolution THz imaging by utilizing a commercial THz imager with a sensitivity of 0.5nW/pixel36.…”

Section: Resultsmentioning

confidence: 99%

Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Miyamoto

Kang

Kim

et al. 2016

Sci Rep

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Optical vortex, possessing an annular intensity profile and an orbital angular momentum (characterized by an integer termed a topological charge) associated with a helical wavefront, has attracted great attention for diverse applications due to its unique properties. In particular for terahertz (THz) frequency range, several approaches for THz vortex generation, including molded phase plates consisting of metal slit antennas, achromatic polarization elements and binary-diffractive optical elements, have been recently proposed, however, they are typically designed for a specific frequency. Here, we demonstrate highly intense broadband monocycle vortex generation near 0.6 THz by utilizing a polymeric Tsurupica spiral phase plate in combination with tilted-pulse-front optical rectification in a prism-cut LiNbO3 crystal. A maximum peak power of 2.3 MW was obtained for THz vortex output with an expected topological charge of 1.15. Furthermore, we applied the highly intense THz vortex beam for studying unique nonlinear behaviors in bilayer graphene towards the development of nonlinear super-resolution THz microscopy and imaging system.

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“…4(a) and (b)). This value should be enough to develop the super-resolution THz imaging by utilizing a commercial THz imager with a sensitivity of 0.5nW/pixel36.…”

Section: Resultsmentioning

confidence: 99%

Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Miyamoto

Kang

Kim

et al. 2016

Sci Rep

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“…Figure 14 shows a large-area transmission and reflection imaging system. The details of the imaging system are described by Oda, N. et al [30] and Ishi, T. et al [43] . It consists of a linearly polarized THz emitter (frequency: ca.480…”

Section: Beam Homogenizermentioning

confidence: 99%

“…Table 2 summarizes the parameters of these THz detectors. The MDP values for some detectors out of these detectors are estimated by Oda, N. et al [30] . Figure 16(a) shows spectral frequency dependences of the MDP values per pixel for these detectors.…”

Section: Comparison Of Performances For Different Detectorsmentioning

confidence: 99%

“…The improvement in MDP was marginal. The fourth improvement Figure 4(a) shows the fourth improvement in the pixel structure to make MDP value better in sub-THz region [30] . A thick SiN layer (ca.…”

mentioning

confidence: 99%

“…7μm thick) and a layered electrical connection were inserted between the thick metallic layer and the air-gap, so that the geometrical optical-cavity length was made much longer by a factor of three than the previous one ( Fig.3). According to the calculation [30] , this modification can increase sensitivity in sub-THz region, and was applied to fabrication of both 320x240 and 640x480 MB-THz-FPAs. A SEM (scanning electron microscope) picture of a part of 640x480 THz-FPA is shown in Fig.4 (b), and pictures of 640x480 and 320x240 chips are shown in Fig.4(c) and (d),…”

mentioning

confidence: 99%

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Technology trend in real-time, uncooled image sensors for sub-THz and THz wave detection

Oda

2016

SPIE Proceedings

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The author summarizes development of uncooled microbolometer terahertz (THz) focal plane arrays (FPAs) and real-time cameras for sub-THz and THz wave detection. The array formats are 320x240 and 640x480, and the cameras have several functions, such as lock-in imaging, external-trigger imaging, image processing (pixel binning and frame integration), beam profiling and so on. The FPAs themselves are sensitive to sub-THz, THz and infrared radiations.Active imaging systems based on the imagers are described. One of them is a real-time transmission-type THz microscope which contains a THz camera and a quantum cascade laser (QCL). The other one is an active sub-THz imaging system, where a transmission imaging mode and a reflection imaging mode can be switched with one-touch operation. Strong THz emitters, such as far-infrared gas lasers and QCLs, are strongly coherent and often produce interference fringes in an image. A method of reducing the interference fringes (beam homogenizing) is described.Microbolometer FPAs developed by other groups, antenna-coupled CMOS FPA, array detectors based on GaAs high-mobility heterostructure and so on are also summarized, which operate in real-time and at room temperature. A fair method of evaluating performance of detectors with different sizes and at different wavelengths is explained and the performances of the detectors are compared.

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Broadband Photodetectors and Imagers in Stretchable Electronics Packaging

Araki

Suzuki

et al. 2023

Advanced Materials

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The integration of flexible electronics with optics can help realize a powerful tool that facilitates the creation of a smart society wherein internal evaluations can be easily performed nondestructively from the surface of various objects that is used or encountered in daily lives. Here, organic‐material‐based stretchable optical sensors and imagers that possess both bending capability and rubber‐like elasticity are reviewed. The latest trends in nondestructive evaluation equipment that enable simple on‐site evaluations of health conditions and abnormalities are discussed without subjecting the targeted living bodies and various objects to mechanical stress. Real‐time performance under real‐life conditions is becoming increasingly important for creating smart societies interwoven with optical technologies. In particular, the terahertz (THz)‐wave region offers a substance‐ and state‐specific fingerprint spectrum that enables instantaneous analyses. However, to make THz sensors accessible, the following issues must be addressed: broadband and high‐sensitivity at room temperature, stretchability to follow the surface movements of targets, and digital transformation compatibility. The materials, electronics packaging, and remote imaging systems used to overcome these issues are discussed in detail. Ultimately, stretchable optical sensors and imagers with highly sensitive and broadband THz sensors can facilitate the multifaceted on‐site evaluation of solids, liquids, and gases.

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Microbolometer Terahertz Focal Plane Array and Camera with Improved Sensitivity in the Sub-Terahertz Region

Cited by 46 publications

References 24 publications

Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Technology trend in real-time, uncooled image sensors for sub-THz and THz wave detection

Broadband Photodetectors and Imagers in Stretchable Electronics Packaging

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