Super resolution terahertz imaging by subpixel estimation: application to hyperspectral beam profiling

Logofătu, Petre Cătălin; Damian, V.

doi:10.1088/2040-8986/aab750

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Terahertz technology has shown excellent prospects in highspeed broadband communications, biomedical sensing, and high-quality imaging [1][2][3][4][5][6][7][8]. Terahertz devices based on metamaterials are of significant interest due to the impact of the lack of natural materials.…”

Section: Introductionmentioning

confidence: 99%

Full-space terahertz metasurface based on thermally tunable InSb

Dong¹,

Sun²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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Terahertz (THz) metasurfaces have potential research value in high-quality molecular imaging, high-speed broadband communication, biology, etc. In this paper, thermally tunable full space metasurface was proposed and analyzed by using Finite Difference Time Domain method based on Pancharatnam–Berry phase modulation and InSb temperature characteristic. At 220 K, a metasurface composed of InSb elements can simultaneously achieve efficient transmission and reflection of the incident circularly polarized light at 0.8 THz and 1.15 THz, respectively. On the contrary, at 360 K, the metasurface absorbs all of the incident terahertz waves, essentially turning off the incident beam. In addition, dynamically tunable metalenses were proposed and used to generate focused vortex light. The proposed metasurface provides a potential direction for developing an efficiency-tunable PB terahertz device in the future.

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Section: Introductionmentioning

confidence: 99%

Full-space terahertz metasurface based on thermally tunable InSb

Dong¹,

Sun²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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“…There is very little published literature on measurements of beam profiles of CW THz emitters, with the vast majority of beam profile data describing pulsed systems [35][36][37][38]. This is primarily due to the widespread use of pulsed THz systems for spectroscopy, where beam profile properties may give rise to errors in spectroscopic data.…”

Section: Introductionmentioning

confidence: 99%

Beam Profile Characterisation of an Optoelectronic Silicon Lens-Integrated PIN-PD Emitter between 100 GHz and 1 THz

et al. 2021

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Knowledge of the beam profiles of terahertz emitters is required for the design of terahertz instruments and applications, and in particular for designing terahertz communications links. We report measurements of beam profiles of an optoelectronic silicon lens-integrated PIN-PD emitter at frequencies between 100 GHz and 1 THz and observe significant deviations from a Gaussian beam profile. The beam profiles were found to differ between the H-plane and the E-plane, and to vary strongly with the emitted frequency. Skewed profiles and irregular side-lobes were observed. Metrological aspects of beam profile measurements are discussed and addressed.

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Ultrasensitive Terahertz Imaging Sensors Based on the Strong Coupling of Surface Phonon Polariton and Graphene Surface Plasmon Polariton

et al. 2018

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Surface plasmon polaritons (SPPs) with noble metals lose the capacity to confine the optical field in the long wavelength region, while surface phonon polaritons (SPhPs) in polar dielectrics show greater ability to achieve high local field, sub-diffraction confinement, and low optical losses in the mid-IR to THz spectral ranges. We propose a hybrid structure based on SPhPs mode with CsI and SPPs mode with graphene in THz spectral ranges. The characteristics of the coupling of these two modes have been analyzed and strong coupling has been confirmed theoretically. The results are applied to an intensity-interrogated terahertz sensor; the highest imaging sensitivity as high as 954 RIU −1 and a large figure of merit of 74 740 RIU −1 have been demonstrated. The results could find potential applications in gas detection in the THz band.

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Super resolution terahertz imaging by subpixel estimation: application to hyperspectral beam profiling

Cited by 3 publications

References 27 publications

Full-space terahertz metasurface based on thermally tunable InSb

Full-space terahertz metasurface based on thermally tunable InSb

Beam Profile Characterisation of an Optoelectronic Silicon Lens-Integrated PIN-PD Emitter between 100 GHz and 1 THz

Ultrasensitive Terahertz Imaging Sensors Based on the Strong Coupling of Surface Phonon Polariton and Graphene Surface Plasmon Polariton

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