Vector characterization of zero-order terahertz Bessel beams with linear and circular polarizations

Wu, Zhen; Wang, Xinke; Feng, Shengfei; Han, Peng; Ye, Jiasheng; Zhang, Yan

doi:10.1038/s41598-017-12524-y

Cited by 33 publications

(12 citation statements)

References 27 publications

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“…At z = −4.5 mm and 4.5 mm, E x manifests the distribution pattern of a Bessel-like beam, including a circular central peak and ring-shaped side-lobes. Therefore, the corresponding E z component shows off-axis main-lobes and crescent side-lobes, which are in agreement with our previous report 18 . On the focal plane (z = 0 mm), the focal spot of E x locates on the position of the THz light ring, so the E z intensities appear on the two sides of the THz light ring.…”

Section: Resultssupporting

confidence: 93%

“…Ultimately, their interference effect forms the annular amplitude and the spiral phase. According to our previous reports 18 , a general law has been summarized for the E z component of a converging light beam. Namely, when a light beam emerges through a set of axial symmetrical wave front modulators, E z with a linear or a circular polarization presents a double-lobe characteristics or a vortex mode.…”

Section: Resultsmentioning

confidence: 99%

“… 4 , the radius of the sharpest THz light ring can be expressed as where α and n is the base angle and the refractive index of the Teflon axicon, f is the focal length of the silicon lens. Herein, these parameters are α = 20°, n = 1.426 18 , f = 8 mm, respectively. The calculated R equals 1.29 mm, which is generally in agreement with the measured value.…”

Section: Resultsmentioning

confidence: 99%

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Vector measurement and performance tuning of a terahertz bottle beam

Wang

et al. 2018

Sci Rep

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A terahertz (THz) bottle beam is realized by adopting the combination of a Teflon axicon and a silicon lens. By using a THz imaging system with a focal-plane array, the vector characteristics of the THz bottle beam are coherently measured and detailedly analyzed, including the transverse (Ex) and longitudinal (Ez) components. The experimental phenomena vividly reveal the distribution characteristics and the formation origin of the THz optical barrier. A vectorial diffraction integral algorithm of a focusing optical system are utilized to exactly simulate the measured results. Besides, the features of the THz bottle beam are effectively tuned by varying the parameters of the Teflon axicon and the silicon lens. This work gives a full view to understand the evolution characteristics of the THz bottle beam and provide a solid experimental foundation for guiding the future applications of this type of THz beam.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Vector measurement and performance tuning of a terahertz bottle beam

Wang

et al. 2018

Sci Rep

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“…Such a unique property of electromagnetic radiation finds a myriad of applications in optics, including molecular orientation control [5], optical tweezers and atom traps [6], and high-resolution fluorescence microscopy [7], to name a few. The field sensitivity in terahertz (THz) time-domain spectroscopy has revealed fundamental natures of Bessel beams in a more complete form than in the visible spectral regime, notably in the temporal phase evolution at the focus [8,9]. Furthermore, THz spectra contain various elementary excitations in solids; hitherto, the unique polarization state is expected to be useful in observing the transitions which cannot be measured with usual plane waves, including plasmons, longitudinal optical phonons, and two-dimensional systems such as intraband transitions of quantum wells, surface states of topological insulators, etc.…”

mentioning

confidence: 99%

Multi-MV/cm longitudinally polarized terahertz pulses from laser–thin foil interaction

Woldegeorgis¹,

Kurihara²,

Almassarani³

et al. 2018

Optica

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Longitudinally polarized terahertz radiation offers access to the elementary excitations and particles that cannot be addressed by transverse waves. While transverse electric fields exceeding 1 MV/cm are widely utilized for nonlinear terahertz spectroscopy, longitudinally polarized terahertz waves at this field strength are yet to be realized. In this paper, we experimentally demonstrate that by focusing radially polarized terahertz fields generated from laser-thin metallic foil interaction, longitudinally polarized terahertz with record-breaking field strength above 1.5 MV/cm can be obtained. Furthermore, we also traced the evolution of the geometric phase of the longitudinal component as it propagates through focus. A novel scheme based on noncollinear electro-optic detection has been utilized to unambiguously measure the polarization states. Our result will scale up the nonlinear spectroscopy of solid materials and particle acceleration experiments where on-axis polarization plays a crucial role.

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“…In addition, handedness multiplexing can be a useful approach to increase the information processing capability of THz telecommunications. However, conventional THz devices (i.e., waveplates 3 , lenses 4 , and axicons 5 ) typically suffer from issues of bulky size and/or low efficiency due to the weak interactions between THz waves and naturally existing materials 6 , which only exhibit electric responses.…”

Section: Introductionmentioning

confidence: 99%

Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces

et al. 2019

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The unrestricted control of circularly polarized (CP) terahertz (THz) waves is important in science and applications, but conventional THz devices suffer from issues of bulky size and low efficiency. Although Pancharatnam–Berry (PB) metasurfaces have shown strong capabilities to control CP waves, transmission-mode PB devices realized in the THz regime are less efficient, limiting their applications in practice. Here, based on Jones matrix analysis, we design a tri-layer structure (thickness of ~λ/5) and experimentally demonstrate that the structure can serve as a highly efficient transmissive meta-atom (relative efficiency of ~90%) to build PB metadevices for manipulating CP THz waves. Two ultrathin THz metadevices are fabricated and experimentally characterized with a z-scan THz imaging system. The first device can realize a photonic spin Hall effect with an experimentally demonstrated relative efficiency of ~90%, whereas the second device can generate a high-quality background-free CP Bessel beam with measured longitudinal and transverse field patterns that exhibit the nondiffracting characteristics of a Bessel beam. All the experimental results are in excellent agreement with full-wave simulations. Our results pave the way to freely manipulate CP THz beams, laying a solid basis for future applications such as biomolecular control and THz signal transportation.

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Vector characterization of zero-order terahertz Bessel beams with linear and circular polarizations

Cited by 33 publications

References 27 publications

Vector measurement and performance tuning of a terahertz bottle beam

Vector measurement and performance tuning of a terahertz bottle beam

Multi-MV/cm longitudinally polarized terahertz pulses from laser–thin foil interaction

Efficient manipulations of circularly polarized terahertz waves with transmissive metasurfaces

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