Enhancement of THz generation by feedback-optimized wavefront manipulation
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
openalex +4 more sources
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
openalex +3 more sources
Interference-assisted kaleidoscopic meta-plexer for arbitrary spin-wavefront manipulation. [PDF]
Xu HX +11 more
europepmc +3 more sources
Independent wavefront manipulation based on multifunctional terahertz metasurface
In 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
doaj +2 more sources
Scatterings and wavefront manipulations of surface plasmon polaritons
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
openalex +2 more sources
Double Interferometer Design for Independent Wavefront Manipulation in Spectral Domain Optical Coherence Tomography. [PDF]
Kanngiesser J, Rahlves M, Roth B.
europepmc +3 more sources
Conformal Sparse Metasurfaces for Wavefront Manipulation [PDF]
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
openaire +2 more sources
Tunable Terahertz Wavefront Modulation Based on Phase Change Materials Embedded in Metasurface
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
doaj +1 more source
Broadband and Dual-Polarized Terahertz Wave Anomalous Refraction Based on a Huygens’ Metasurface
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
doaj +1 more source
Acoustic wavefront manipulation via transmission-type labyrinth structure
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
doaj +1 more source

