Real-time imaging using a 28 THz quantum cascade laser and uncooled infrared microbolometer camera

Behnken, Barry N.; Karunasiri, Gamani; Chamberlin, D. R.; Robrish, P. R.; Faist, Jérôme

doi:10.1364/ol.33.000440

Cited by 112 publications

(56 citation statements)

References 7 publications

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“…A real time video recording of the QCL beam, gated at 500 mHz, is shown in Fig. 12(c) (Media 1) compared with the same image obtained using a commercial IR microbolometer camera with THz optics [7] (Fig. 12(b)).…”

Section: Fabrication and Characterizationmentioning

confidence: 99%

“…Real-time THz imaging has been demonstrated using conventional, microbolometer-based imagers optimized for infrared (IR) wavelengths (8-12 μm) coupled with a quantum cascade laser (QCL) as an illumination source [6,7]. The limitations of this approach are the low sensitivity of the microbolometer cameras in the THz region and small pixel size (~30 μm), compared with THz wavelengths (~100 μm at 3 THz).…”

Section: Introductionmentioning

confidence: 99%

“…Additional difficulties exist when the detection range is extended to the THz region. The low thermal background power in THz demands highly sensitive detectors and, in most cases, external THz illumination is also required [7][8][9][10][11][12]. The lack of fabrication-friendly natural materials exhibiting high THz absorption makes metamaterial absorbers tuned to THz frequencies very attractive.…”

Section: Introductionmentioning

confidence: 99%

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Bi-material terahertz sensors using metamaterial structures

Alves¹,

Grbovic²,

Kearney³

et al. 2013

Opt. Express

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110

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Abstract:In this paper we report on the design, fabrication and characterization of terahertz (THz) bi-material sensors with metamaterial absorbers. MEMS fabrication-friendly SiO x and Al are used to maximize the bimetallic effect and metamaterial absorption at 3.8 THz, the frequency of a quantum cascade laser illumination source. Sensors with different configurations were fabricated and the measured absorption is near 100% and responsivity is around 1.2 deg/μW, which agree well with finite element simulations. The results indicate the potential of using these detectors to fabricate focal plane arrays for real time THz imaging.

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Section: Fabrication and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bi-material terahertz sensors using metamaterial structures

Alves¹,

Grbovic²,

Kearney³

et al. 2013

Opt. Express

Self Cite

110

View full text Add to dashboard Cite

show abstract

“…Evidently, the most straightforward way is to employ commercially available infrared microbolometer array for real-time image recording in THz frequency range as demonstrated recently [1]. A camera has been developed for 8-14 µm wavelength range, but it appears to be able to record images at THz range with rather low signal-to-noise ratio.…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependent properties of InGaAs bow-tie detectors in terahertz range

Minkevičius¹,

Kašalynas²,

Seliuta³

et al. 2010

Lithuanian J. Phys.

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Finite-difference time-domain simulation results in bow-tie InGaAs diodes are presented. Dependences of electric field amplitude on frequency were investigated for various device shapes and sizes. It was shown that two metallized parts of the bow-tie type detector act as the separate antennas causing thus the experimentally observed fast sensitivity reduction at 1.63, 1.83, and 2.51 THz frequencies. Moreover, it has been demonstrated that the estimated effective average refractive index of the region around the antenna for all investigated angles and dimensions is nearly constant, and this constant value could be used for further estimation of frequency dependent properties in the case of other slightly altered bow-tie detector geometry.

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“…THz imaging in 1-10 THz has been demonstrated using conventional, microbolometer-based imagers optimized for infrared (IR) wavelengths (8-12 μm) coupled with a quantum cascade laser (QCL) as an illumination source [1,2]. Since the background thermal energy in the THz range is small compared to that of infrared (IR) for passive imaging, THz imaging schemes usually employ a source to illuminate the target.…”

mentioning

confidence: 99%