Superconducting Detector Array for Terahertz Imaging Applications

Ariyoshi, Seiichiro; Otani, Chiko; Dobroiu, Adrian; Matsuo, Hiroshi; Sato, Hiromi; Taino, Tohru; Kawase, Kodo; Shimizu, Hirohiko M.

doi:10.1143/jjap.45.l1004

Cited by 20 publications

(10 citation statements)

References 16 publications

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“…Such arrays can operate up to video frame rates of around 60 Hz; however, their sensitivities are limited, and scaling to large pixel numbers can be challenging [16]. More sensitive arrays such as those based on superconductors [17] suffer similar scaling problems and rely on cryogenic cooling to overcome thermal noise, making them cumbersome, expensive, and complex to operate. Another promising approach to full-field THz imaging is frequency up-conversion, where a nonlinear optical material such as diamond [18] or DAST crystal [19] is used to convert incident THz photons to more easily detectable wavelengths, allowing images to be collected using standard optical or IR cameras.…”

Section: Introductionmentioning

confidence: 99%

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

et al. 2020

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There is much interest in employing terahertz (THz) radiation across a range of imaging applications, but so far, technologies have struggled to achieve the necessary frame rates. Here, we demonstrate a THz imaging system based upon efficient THz-to-optical conversion in atomic vapor, where full-field images can be collected at ultrahigh speeds using conventional optical camera technology. For a 0.55-THz field, we show an effective 1-cm 2 sensor with near diffraction-limited spatial resolution and a minimum detectable power of ð190 AE 30Þ fW s −1=2 per ð40 × 40Þ μm 2 pixel capable of video capture at 3000 frames per second. This combination of speed and sensitivity represents a step change in the state of the art of THz imaging and will likely lead to its uptake in wider industrial settings.

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Section: Introductionmentioning

confidence: 99%

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

et al. 2020

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“…Additional applications of MEMS and THz radiation technology have also been investigated for imaging purposes. The incorporation of superconductors [21] and metamaterials [22] on MEMS devices has enabled the direct absorption and sensing of THz radiation. As acoustic sensors, arrays of piezoelectric cantilever and spiral beam-supported diaphragm transducers have shown increased sensitivity by approximately 30 times when many transducers were connected in parallel [23].…”

Section: Introductionmentioning

confidence: 99%

MEMS-Based Terahertz Photoacoustic Chemical Sensing System

Glauvitz¹,

Coutu²,

Medvedev³

et al. 2016

Progresses in Chemical Sensor

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Advancements in microelectromechanical system (MEMS) technology over the last several decades has been a driving force behind miniaturizing and improving sensor designs. In this work, a specialized cantilever pressure sensor was designed, modeled, and fabricated to investigate the photoacoustic (PA) response of gases to terahertz (THz) radiation under low-vacuum conditions associated with high-resolution spectroscopy. Microfabricated cantilever devices made using silicon-on-insulator (SOI) wafers were tested in a custom-built test chamber in this first ever demonstration of a cantileverbased PA chemical sensor and spectroscopy system in the THz frequency regime. The THz radiation source was amplitude modulated to excite acoustic waves in the chamber, and PA molecular spectroscopy of a gas species was performed. An optical measurement technique was used to evaluate the PA effect on the cantilever sensor; a laser beam was reflected off the cantilever tip and through an iris to a photodiode. As the cantilever movement deflected the laser beam, the beam was clipped by an iris and generated the PA signal. Experimental data indicated a predominantly linear response in signal amplitude from the photodiode measurement technique, which directly correlated to measured cantilever deflections. Using the custom-designed PA chamber and MEMS cantilever sensor, excellent low-pressure PA spectral data of methyl cyanide (CH 3 CN) at 2 to 40 mTorr range has been obtained. At low chamber pressures, the sensitivity of our system was 1.97 × 10 −5 cm −1 and had an excellent normalized noise equivalent absorption (NNEA) coefficient of 1.39 × 10 −9 cm −1 W Hz -½ using a 0.5 s signal averaging time.

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“…Additionally, mm‐wave imaging systems need the use of complex focusing structures; that is, metallic mirrors with moveable parts to scan in 2D the overall image under analysis .…”

Section: Introductionmentioning

confidence: 99%

“…The mm‐wave imaging systems can work in an active or in a passive way. If a power source is used to illuminate the targets, then the system is known as active . If no power source is used to illuminate the targets, then the system is passive .…”

Section: Introductionmentioning

confidence: 99%

Mm‐wave imaging results based on a frequency scanning delay line waveguide horn antenna array

Larumbe-Gonzalo

Ibáñez-Loinaz²,

Gonzalo

et al. 2014

Micro & Optical Tech Letters

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First experimental mm‐wave imaging results, acquired with a frequency scanning horn antenna array, are presented. The antenna achieves a circular pattern that scans more than 30° in the E‐plane. Images acquired with this configuration are presented, demonstrating the benefits of these kinds of frequency scanning antennas for reduced cost imaging applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2851–2860, 2014

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Superconducting Detector Array for Terahertz Imaging Applications

Cited by 20 publications

References 16 publications

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

MEMS-Based Terahertz Photoacoustic Chemical Sensing System

Mm‐wave imaging results based on a frequency scanning delay line waveguide horn antenna array

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