Multiplexing THz Vortex Beams With a Single Diffractive 3-D Printed Lens

Machado, Federico; Zagrajek, Przemysław; Ferrando, Vicente; Monsoriu, Juan A.; Furlan, Walter D.

doi:10.1109/tthz.2018.2883831

Cited by 17 publications

(11 citation statements)

References 32 publications

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“…Also using plasma, a THz pulse with OAM is obtained by employing two twisted input lasers [20]. What is more, some multiplexing/demultiplexing systems of THz OAM also have been demonstrated successfully [21][22][23], and the results indicate the potential of THz OAM in improving channel capacity.…”

Section: Introductionmentioning

confidence: 95%

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Tong

Ding

et al. 2022

Plasma Sci. Technol.

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The transmission of terahertz (THz) Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab is investigated by using a hybrid method of cylindrical vector wave functions (CVWFs) and Fourier transform. On the basis of the electromagnetic boundary conditions on each interface, a cascade form of expansion coefficients of the reflected and transmitted fields is obtained. Taking a double Gaussian distribution of the plasma density as an example, the influences of the applied magnetic field, the incident angle and polarization mode of the incident beams on the magnitude, OAM mode and polarization of the transmitted beams are analyzed in detail. The results indicate that the applied magnetic field has a major effect upon the polarization state of the transmitted fields but not upon the transmitted OAM spectrum. The incident angle has a powerful influence upon both the amplitude profile and the OAM spectrum of the transmitted beam. Furthermore, for multiple coaxial vortex beams, an increase of the maximum value of the plasma density causes more remarkable distortion of both the profile and OAM spectrum of the transmitted beam. This research makes a stable foundation for the THz OAM multiplexing/demultiplexing technology in magnetized plasma environment.

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Section: Introductionmentioning

confidence: 95%

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Tong

Ding

et al. 2022

Plasma Sci. Technol.

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“…Vortex beams can also be created by helical-based elements combined with converging lens distributions with different angular area division [ 99 , 100 ]. The radius and width of the vortex allow controling the topological charge which results in efficient forming of multiplexed THz vortex rings.…”

Section: Non-diffractive Beamsmentioning

confidence: 99%

The Magic of Optics—An Overview of Recent Advanced Terahertz Diffractive Optical Elements

Siemion

2020

Sensors

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Diffractive optical elements are well known for being not only flat but also lightweight, and are characterised by low attenuation. In different spectral ranges, they provide better efficiency than commonly used refractive lenses. An overview of the recently invented terahertz optical structures based on diffraction design is presented. The basic concepts of structure design together with various functioning of such elements are described. The methods for structure optimization are analysed and the new approach of using neural network is shown. The paper illustrates the variety of structures created by diffractive design and highlights optimization methods. Each structure has a particular complex transmittance that corresponds to the designed phase map. This precise control over the incident radiation phase changes is limited to the design wavelength. However, there are many ways to overcome this inconvenience allowing for broadband functioning.

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“…Furthermore, THz detectable differences of water content in tissues were shown to be useful for biomedical imaging, , which is highly attractive for constant monitoring needs due to the low energies of THz radiation (∼meV) that do not harm biological tissues, as opposed to X-rays (with energies of ∼keV). In addition, a great effort is put into utilizing the high carrier frequencies of the THz band which promise large data rates and channel capacities for next-generation communications. − These applications can be further improved through optimization of the spatial and temporal properties of THz waves. However, due to various challenges, such as material absorption in this spectral region, creating broadband optical elements is not straightforward, and innovative beam-shaping methods have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Generating Angular-Varying Time Delays of THz Pulses via Direct Space-to-Time Mapping of Metasurface Structures

Elias,

Sideris,

McDonnell

et al. 2023

ACS Appl. Opt. Mater.

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We experimentally demonstrate the generation of double terahertz (THz) pulses with tailored angular-dependent time delays from a nonlinear metasurface excited by a near-infrared femtosecond pulse. The tailored temporal properties of the generated pulses emerge from a direct mapping of the nonlinear spatial response of the metasurface to the emitted THz temporal profile. We utilize the Pancharatnam-Berry phase to implement symmetric and antisymmetric metasurface configurations and show that the emitted patterns present spatiotemporal “X-shaped” profiles after collimation by a parabolic mirror, with angular-dependent pulse delays corresponding to the intended design. In addition, we show that the addition of polarization multiplexing presents the opportunity to achieve a full range of elliptical THz polarizations. Double pulse generation and spatiotemporal shaping of THz waves in general show potential for THz spectroscopy and molecular dynamics applications, particularly in pump–probe experiments.

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Multiplexing THz Vortex Beams With a Single Diffractive 3-D Printed Lens

Cited by 17 publications

References 32 publications

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

The Magic of Optics—An Overview of Recent Advanced Terahertz Diffractive Optical Elements

Generating Angular-Varying Time Delays of THz Pulses via Direct Space-to-Time Mapping of Metasurface Structures

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