Proposal for real-time terahertz imaging system with palm-size terahertz camera and compact quantum cascade laser

Oda, Naoki; Lee, Alan W. M.; Ishi, Tsutomu; Hosako, Iwao; Hu, Qing

doi:10.1117/12.917682

Cited by 36 publications

(19 citation statements)

References 23 publications

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“…Recently, there has been considerable interest in THz applications such as imaging, security checking, nondestructive testing, and communication technologies [1]. In the past few years, there has been an extensive effort to investigate the high-performance THz camera [2] and THz imaging has received considerable attention for biological and industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Introduction of liquid crystal device into THz phase imaging

et al. 2015

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We investigate the terahertz (THz) phase imaging using liquid crystal (LC) device. Recently, there have been extensive efforts to measure the refractive indices and transmission losses of some LC materials in THz region. From these results, LC materials show relatively large refractive index anisotropy and they can have a potential application to some control devices similar to the display application. Furthermore, tunable LC THz phase shifter has been reported. In this study, an attempt was made to introduce the LC device into the THz phase imaging which was based on four-step phase-shifting algorithm. Four-step phase-shifting algorithm is one of the most effective methods of phase imaging and moving mirror is needed to introduce phase shift in standard measurements. In addition, we should prepare the two rays with common source, therefor experimental setup becomes complicated. While on the other hand, it is just needed to insert a LC phase shifter into the light path when we adopt LC device. Furthermore, low-voltage application is enough to introduce the phase-shifting, hence it is not necessary to prepare the moving mirror. In this work, we fabricate the electrically tunable LC phase shifter which has sandwich cell structure. The fundamental phase-shifting properties were measured by using an optically pumped gas laser system which can generate continuous wave (CW) THz waves. In addition, we investigated the phase shifting interferometry which was based on four-step phase-shifting algorithm by using LC phase shifter. We also estimate the birefringence of X-cut crystalline quartz at 2.5 THz.

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Section: Introductionmentioning

confidence: 99%

Introduction of liquid crystal device into THz phase imaging

et al. 2015

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“…The papers [5] - [7] show that NEP values of THz-FP As are in a range of 25-75 pW around 2.5 THz. Taking NEP value of 75pW, SNR value of 10 0 and overall efficiency (T) of 50%, the minimum power of THz source can be estimated for three THz-FPAs [5] - [7] .…”

Section: Fig 1 Configuration For Nuc Operationmentioning

confidence: 98%

“…NON-UNIFORMITY CORRECTION Non-uniformity correction (NUC) for THz-FPA in THz camera is presumably carried out in IR region in most of cases, using two large blackbodies with different temperatures, because there are no large, uniform and strong THz sources, and THz-FPA is still sensitive to IR radiation [5] . As a result, residual non-uniformity in IR is ca.…”

Section: Power Measurementsmentioning

confidence: 99%

On the necessity of standardization for power and sensitivity measurements of terahertz sources and cameras

Oda¹,

Hosako

Ishi³

et al. 2013

2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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“…(i) A THz InGaAs Schotky barrier diode array detector with 20 elements is built for real-time, compact and portable scanners in a TPI system [42]. (ii) Another real-time TPI system is built using a palm-size THz camera that contains a microbolometer array and a compact quantum cascade laser (QCL) [52]. (iii) A real-time transmission-type THz microscope is proposed by employing a THz penetration-enhancing agent, glycerol, to improve the THz penetration depth in tissues because the glycerol has low absorption of THz waves compared with water [53].…”

Section: Thz Pulsed Imaging Systemmentioning

confidence: 99%

Terahertz Pulse Detection Techniques and Imaging Applications

Chen¹,

Guo²

2017

Terahertz Spectroscopy - A Cutting Edge Technology

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Recent years have witnessed successful developments of detection techniques of teraherz (THz) pulse radiation and its imaging applications such as security, medicine and environmental sensing, to name an important few. Progress of detection techniques has been made in many aspects, including detection sensitivity, real-time detection, roomtemperature operation, detection bandwidth and dynamic range, spatial (wavefront) and temporal proiles and so on. New detection techniques utilizing cuting-edge materials, sensors, systems and even novel detection mechanisms contribute to advances in teraherz pulse detection. While detection techniques continuously improve, teraherz pulsed imaging (TPI) also inds broad and intriguing applications. For instance, TPI has shown applications in nondestructive evaluation in pharmaceutics, biomedical characterization of tissues, medical diagnosis of cancers, identiication of explosive hazards and examination of art and archeology. The chapter highlights recent progress of teraherz pulse detection techniques and imaging applications.

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Proposal for real-time terahertz imaging system with palm-size terahertz camera and compact quantum cascade laser

Cited by 36 publications

References 23 publications

Introduction of liquid crystal device into THz phase imaging

Introduction of liquid crystal device into THz phase imaging

On the necessity of standardization for power and sensitivity measurements of terahertz sources and cameras

Terahertz Pulse Detection Techniques and Imaging Applications

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