Enhancement of THz generation by feedback-optimized wavefront manipulation
Optics Express, 2017 We apply active feedback optimization methods to pyroelectric measurements of a THz signal generated by four wave mixing in air using 1 mJ to 12 mJ, 35 fs laser pulses operating at 12 kHz repetition rate. A genetic algorithm, using the THz signal as a figure of merit, determines the voltage settings to a deformable mirror and results in up to a 6 fold ...
J. Hah +6 more
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Electromagnetic metagratings for efficient wavefront manipulation
Compared to traditional metasurfaces, metagratings have demonstrated pronounced advantages in efficient wavefront manipulation in recent years. These advantages primarily stem from two key factors: first, metagratings effectively eliminate wave impedance mismatch between incoming and outgoing waves, thus facilitating near-optimal efficiency in ...
Zhen Tan
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Interference-assisted kaleidoscopic meta-plexer for arbitrary spin-wavefront manipulation. [PDF]
Light Sci Appl, 2019 Xu HX +11 more
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Independent wavefront manipulation based on multifunctional terahertz metasurface
AIP AdvancesIn this paper, a full-space metasurface is designed to control the transmitted circularly polarized waves and reflected linearly polarized waves independently at two different terahertz frequencies. The proposed metasurface unit consists of two layers of
Xinyu Liu, Jiajun Liang, Xiangsuo Fan
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Scatterings and wavefront manipulations of surface plasmon polaritons
Acta Physica Sinica, 2020 Surface plasmon polaritons (SPPs) have found many important applications in on-chip signal transportation, enhanced nonlinear/Raman effect, biological/chemical sensing, super resolution imaging, etc. In these applications, the near-field propagation and far-field scattering of SPPs play a vital role.
Fuxin Guan +5 more
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Double Interferometer Design for Independent Wavefront Manipulation in Spectral Domain Optical Coherence Tomography. [PDF]
Sci Rep, 2019 Kanngiesser J, Rahlves M, Roth B.
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Conformal Sparse Metasurfaces for Wavefront Manipulation [PDF]
Physical Review Applied, 2020 While flat metasurfaces are intensively studied, theoretical modelling of conformal metasurfaces appears to be exceptionally challenging where it demands accurate analysis of the metasurface geometry. Here, it is shown how numerical calculation of Green's function can be employed to design conformal sparse metasurfaces of arbitrary geometries within ...
Popov, Vladislav +2 more
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Tunable Terahertz Wavefront Modulation Based on Phase Change Materials Embedded in Metasurface
Nanomaterials, 2022 In the past decades, metasurfaces have shown their extraordinary abilities on manipulating the wavefront of electromagnetic wave. Based on the ability, various kinds of metasurfaces are designed to realize new functional metadevices based on wavefront ...
Ming Zhang +7 more
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Broadband and Dual-Polarized Terahertz Wave Anomalous Refraction Based on a Huygens’ Metasurface
Frontiers in Materials, 2022 Terahertz wavefront manipulation is one of the key terahertz technologies. While few of the research works on terahertz wavefront manipulation has broadband and dual-polarized responses. Here a broadband dual-polarized Huygens’ metasurface is proposed to
Jia Ran +6 more
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Acoustic wavefront manipulation via transmission-type labyrinth structure
Frontiers in Physics, 2022 In this work, a transmission-type labyrinth structure (LS) is proposed to construct subwavelength acoustic functional metasurfaces, through which various desirable acoustic wavefront manipulation can be achieved in a broadband from 2,700 Hz to 3,900 Hz ...
Rui Wang, Fengbao Yang
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