Ghost imaging via spectral multiplexing in the broadband terahertz range

Ismagilov, Azat; Lappo-Danilevskaya, Anastasia; Grachev, Yaroslav V.; Nasedkin, B. A.; Zalipaev, V. V.; Petrov, Nikolay V.; Tsypkin, A. N.

doi:10.1364/josab.465222

Cited by 17 publications

(4 citation statements)

References 47 publications

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“…56 the formation of speckle patterns during propagation of broadband THz radiation through a transparent inhomogeneous phase object and the possibility of their use for the GI were demonstrated. Due to the use of a wide-aperture electro-optical crystal in the THz PTDH module, 40,41 both spectrum-integrated speckle patterns (a similar result can be expected from the use of an array of detectors) and speckle patterns formed at individual frequencies 43,57 were obtained. In the case of using 3D-printed ABS diffusers (refractive index n = 1.55, standard deviation of the surface height h rms = 0.8 mm, correlation length Cl = 1.5 mm) about 20 speckle patterns are formed (Fig.…”

Section: Spectral Multiplexing In the Thz Frequency Rangementioning

confidence: 54%

Ghost imaging with auxiliary multiplex channels: a review of the latest results

Petrov,

Ismagilov,

Oparin

et al. 2024

Speckle 2023: VIII International Conference on Speckle Metrology

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In this paper, we present a review of the latest results obtained in the scope of ghost imaging using auxiliary multiplex channels. The proposed methods make it possible to increase the speed of image acquisition, as well as eliminate distortions in the signal of a bucket detector. One of the most serious limitations of ghost imaging is the large number of measurements required. During the data acquisition, the optical environment where the observation object is located may change its parameters, which will negatively affect the quality of the reconstructed image. To solve these problems, it is possible to use fast spatial light modulators to set structured patterns and fast detectors. However, such equipment is not available in some spectral ranges and is not able to suppress distortions in the detected signal. In this regard, our team has proposed a number of techniques to solve the problems of a large number of measurements and non-stationarity of the optical medium in ghost imaging systems. First of all, an auxiliary polarization channel method was presented in a ghost imaging system to eliminate distortion in the signal of a bucket detector. Secondly, wavelength multiplexing methods have been proposed in the visible and terahertz wavelength ranges. These methods will make ghost imaging systems more applicable to the tasks of remote sensing and mapping of areas in various spectral ranges.

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Section: Spectral Multiplexing In the Thz Frequency Rangementioning

confidence: 54%

Ghost imaging with auxiliary multiplex channels: a review of the latest results

Petrov,

Ismagilov,

Oparin

et al. 2024

Speckle 2023: VIII International Conference on Speckle Metrology

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“…In particular, THz vortex generators play an essential role in numerous applications: in the detection of magnetic properties, [28] quantum condensate control, wireless communications, [29][30][31] generation of plasmon polaritons, [32][33][34] THz imaging, and ghost imaging. [35][36][37] The importance of vortex comes from the fact that these beams carry orbital angular momentum (OAM), which characterizes the composition of vortex modes in the beam. The properties of their orthogonality are actively used to expand the information capacity of optical channels.…”

Section: Introductionmentioning

confidence: 99%

Expanding THz Vortex Generation Functionality with Advanced Spiral Zone Plates Based on Single‐Walled Carbon Nanotube Films

Radivon,

Katyba,

Raginov

et al. 2024

Advanced Optical Materials

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Optical elements based on nanomaterials are becoming major avenues to satisfy the technological requirements of compact, lightweight, and tunable elements of the emerging terahertz (THz) field. A new generation of diffractive components integrating specific geometry with additional features (flexibility, stretchability, rotation, and other approaches for tuning properties) extends the functionality of wavefront control. Here, an innovative approach is demonstrated to control the THz wavefront via a layered composition of spiral zone plates (SZPs) with tunable mutual orientation and scaling. As a proof of concept, the SZP is designed using Laguerre‐Gauss mode analysis with further fabrication and experimental characterization of the resultant vortex beams. For each single SZP, a flexible element is proposed based on a thin film of single‐walled carbon nanotubes deposited on a stretchable substrate. Thus, this diffraction element can be tuned not only by rotation (along the azimuthal direction), but also by its stretching (in the radial direction). The spatial tuning of the developed SZPs (spiral zone plates) opens up an efficient, convenient, and highly customizable approach for the manipulation of vortex beams.

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“…Research in THz technology has focused on detection, communication, and imaging. Due to the lack of efficient terahertz devices, the rich THz spectrum resources have not been fully exploited and have become a research hotspot in academia [2][3][4][5]. As one of the application devices of the THz system, the THz absorber has also attracted extensive attention from the scientific community and has become a key to promoting the application of THz technology [6,7].…”

Section: Introductionmentioning

confidence: 99%

A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

Cai

Kou

2023

Photonics

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A MoS2 and graphene stacked structure is proposed as metamaterials for a triple-band terahertz absorber in this work. The complementary frequency-selective surface of the absorber, consisting of two crossed linear slots and four pairs of concentric circular slots, has three absorptions at 0.6 THz (99.7%), 1.5 THz (95.4%), and 2.5 THz (99.5%). The polarization of the THz absorber is less sensitive to the incident angle within a certain range. By controlling the material properties of MoS2 and graphene, the peak absorption frequency can be tuned within a certain range. The stacked structure of different 2D materials provides new ideas for the design of the THz absorber, which is important for THz in detection, communication, and imaging applications.

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Ghost imaging via spectral multiplexing in the broadband terahertz range

Cited by 17 publications

References 47 publications

Ghost imaging with auxiliary multiplex channels: a review of the latest results

Ghost imaging with auxiliary multiplex channels: a review of the latest results

Expanding THz Vortex Generation Functionality with Advanced Spiral Zone Plates Based on Single‐Walled Carbon Nanotube Films

A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

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