Simulations and measurements of the electromagnetic response of broadband THz uncooled antenna-coupled microbolometer array

Nguyen, Duy-Thong; Simoens, F.; Ouvrier-Buffet, Jean-Louis; Meilhan, Jean–Baptiste; Coutaz, Jean‐Louis

doi:10.1109/mikon.2012.6233506

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…7 It is also often important to ensure that the lasers have low dissipated power. Devices based on third-order distributed feedback (DFB) architectures are a good solution to these requirements, [8][9][10] since their dimensions can be scaled down without compromising the beam quality.…”

mentioning

confidence: 99%

Surface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range

Isac

et al. 2014

Appl. Phys. Lett.

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We demonstrate efficient surface-emitting terahertz frequency quantum cascade lasers with continuous wave output powers of 20-25 mW at 15 K and maximum operating temperatures of 80-85 K. The devices employ a resonant-phonon depopulation active region design with injector, and surface emission is realized using resonators based on graded photonic heterostructures (GPHs). GPHs can be regarded as energy wells for photons and have recently been implemented through grading the period of the photonic structure. In this paper, we show that it is possible to keep the period constant and grade instead the lateral metal coverage across the GPH. This strategy ensures spectrally singlemode operation across the whole laser dynamic range and represents an additional degree of freedom in the design of confining potentials for photons. V C 2014 AIP Publishing LLC.

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mentioning

confidence: 99%

Surface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range

Isac

et al. 2014

Appl. Phys. Lett.

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“…Polarization is controlled with a wire grid polarizer inserted in the set-up. This experimental result is compared with the |S 11 | 2 parameter (dotted line of figure 2) extracted from threedimensional FEM simulations in which each pixel of the array is considered as a Floquet cell [29]. A very good match between simulations and measurements is observed over the whole frequency range: a distinct absorption peak arises (at 1.35 and 1.7 THz) as a dip in reflectivity and the shapes follow the same trends.…”

Section: Modelled and Measured Figures Of Meritmentioning

confidence: 81%

“…Extensive three-dimensional finite-element method (FEM) simulations [29] were carried out with the commercial High Frequency Structure Simulator (HFSS) and Comsol codes to design two kinds of pixels. They are optimized at 1.7 and 2.4 THz for CC polarization while maintaining maximum absorption at 1.35 THz for the DC direction.…”

Section: Prototyped Terahertz Bolometer Arraysmentioning

confidence: 99%

Terahertz real-time imaging uncooled array based on antenna- and cavity-coupled bolometers

Simoens

Meilhan

2014

Phil. Trans. R. Soc. A.

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The development of terahertz (THz) applications is slowed down by the availability of affordable, easyto-use and highly sensitive detectors. CEA-Leti took up this challenge by tailoring the mature infrared (IR) bolometer technology for optimized THz sensing. The key feature of these detectors relies on the separation between electromagnetic absorption and the thermometer. For each pixel, specific structures of antennas and a resonant quarter-wavelength cavity couple efficiently the THz radiation on a broadband range, while a central silicon microbridge bolometer resistance is read out by a complementary metal oxide semiconductor circuit. 320 × 240 pixel arrays have been designed and manufactured: a better than 30 pW power direct detection threshold per pixel has been demonstrated in the 2-4 THz range. Such performance is expected on the whole THz range by proper tailoring of the antennas while keeping the technological stack largely unchanged. This paper gives an overview of the developed bolometer-based technology. First, it describes the technology and reports the latest performance characterizations. Then imaging demonstrations are presented, such as realtime reflectance imaging of a large surface of hidden objects and THz time-domain spectroscopy beam twodimensional profiling. Finally, perspectives of camera integration for scientific and industrial applications are discussed.

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“…Holographic THz imaging has developed quickly in the last couple of years, becoming more and more actual and mature as a result of the progress in novel compact and powerful THz sources [13]- [16] and THz-capable array detectors [17], [18]. Holographic imaging outperforms both TDS scan and tomographic techniques in acquisition time, provides better spatial resolution, and needs less computational powers for numerical reconstruction than tomography.…”

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confidence: 99%

Application of Terahertz Pulse Time-Domain Holography for Phase Imaging

Petrov

Kulya

Tsypkin

et al. 2016

IEEE Trans. THz Sci. Technol.

107

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Terahertz pulse time-domain holography (THz PTDH) is the powerful technique for high-resolution amplitude and phase THz imaging that allows mapping spectroscopic information across the imaged object. In this paper, we consider most sought after applications of phase imaging provided by this technique and experimentally demonstrate the ability of the method to reconstruct smooth and stepped relief features of an object that is transparent in THz region. Unlike the amplitude distribution, which does not contain any significant information in this case, phase distribution not only reveals the object qualitatively, but also allows the reconstruction of the object thicknesses pattern, even in low signal-to-noise registration conditions. Main limitations of the proposed method, such as transverse resolution and low signal-to-noise environment are carefully studied and mitigated.

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Simulations and measurements of the electromagnetic response of broadband THz uncooled antenna-coupled microbolometer array

Cited by 6 publications

References 9 publications

Surface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range

Surface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range

Terahertz real-time imaging uncooled array based on antenna- and cavity-coupled bolometers

Application of Terahertz Pulse Time-Domain Holography for Phase Imaging

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