Terajet effect of dielectric sphere and THz imaging

Qu, Qingshan; Liu, Hailing; Zhu, Di; Yang, Menghan; Cui, Bin; Feng, Shuai; Yang, Yuchen

doi:10.1117/12.2500909

Infrared, Millimeter-Wave, and Terahertz Technologies V 2018

DOI: 10.1117/12.2500909

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Terajet effect of dielectric sphere and THz imaging

Qingshan Qu

Hailing Liu

Di Zhu

et al.

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Cited by 3 publications

References 16 publications

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Terajet-assisted time-domain super-resolution imaging

Paddubskaya,

Valynets,

Novitsky

et al. 2024

J. Phys. D: Appl. Phys.

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Large-scale applications of real-time terahertz (THz) imaging are often limited by the spatial resolution of a THz microscope. One of the simplest approaches to circumvent this problem in practice and achieve resolution below the diffraction limit consists in placing a dielectric particle with a size comparable to the radiation wavelength in the vicinity of the focal plane of the THz imaging system. Here, we theoretically consider the transmittance of a THz Gaussian beam through a Teflon sphere to further analyze experimental results on THz superresolution imaging. We address the resolution beyond the diffraction limit (the experimentally determined value is 0.38λ at 0.46 THz) through the superlens effect of the terajet generated by the mesoscale sphere owing to propagating and evanescent partial waves in the terajet. Due to the coupling of the dielectric sphere and time-domain THz spectrometer, we can detect a 10 µm thick PTEF film, which is almost transparent (98% transmittance) in the THz frequency range. The correlation between the transmittance spectrum of the dielectric sphere and the quality of THz images of thin, nonconducting films collected at different frequencies has been demonstrated experimentally and considered analytically. Our study is relevant for hyperspectral imaging applications and further development of the sphere-coupled time-domain THz imaging technique.

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Terajet-assisted time-domain super-resolution imaging

Paddubskaya,

Valynets,

Novitsky

et al. 2024

J. Phys. D: Appl. Phys.

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Tunable GRIN lensing based on graphene-dielectric multilayer metamaterials

Moharrami

Atlasbaf

2020

J. Opt.

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In this paper, we have proposed effective gradient refractive index structures at terahertz frequencies, which function as a planar lens, focusing reflector, and a generalized Luneburg lens (GLL). We base the structures on planar and cylindrical graphene-dielectric multilayer metamaterials. The structures are designed by tailoring the surface conductivity of the graphene layers to provide a given phase profile along with the structures. Therefore, the customizable focus area of the focusing devices, and the tunable terahertz jet effect that is produced by the GLL result. The proposed structures have potential applications in terahertz imaging, sensing, detecting, and communication areas.

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Accurate reconstruction of terahertz spectral images with enhanced spatial resolution via complex mapping

Zhu,

Chen,

Pickwell-MacPherson

et al. 2024

Opt. Express

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The wavelength of terahertz waves varies by two orders of magnitude. Long-wavelength terahertz images suffer from low spatial resolution due to the millimeter-level diffraction limit. Conventional resolution-enhancing methods are generally limited by sample types and field of view. To overcome these challenges, we propose a resolution-enhancing algorithm for terahertz spectral imaging. This algorithm leverages the advantage of ultra-broadband complex spectral imaging and determines the mapping relationship between the short- and long-wavelength images through clustering and genetic algorithm optimization. The numerical modality supports nearly all optical configurations and sample types. Transmission and reflection measurements validate the superior performance, demonstrating up to 6-fold resolution improvement. Moreover, the complex spectra can be accurately recovered, enabling precise extraction of broadband complex permittivity and subsequent analysis for sub-diffraction-limit objects.

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Terajet effect of dielectric sphere and THz imaging

Cited by 3 publications

References 16 publications

Terajet-assisted time-domain super-resolution imaging

Terajet-assisted time-domain super-resolution imaging

Tunable GRIN lensing based on graphene-dielectric multilayer metamaterials

Accurate reconstruction of terahertz spectral images with enhanced spatial resolution via complex mapping

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