Towards practical applications of direction-dependent metasurfaces, the reconfigurability with the change of external incentives is highly expected 17, 18, 19, 20, 21. Compared to conventional metasurface holography, the additional freedom brought by the propagation direction in Janus metasurface can further enhance the design space and information capacity. The Janus metasurface consisting of a stack of twisted meta-sheets can act as free-space holographic imagers for opposite propagation directions. Recently, asymmetric but still reciprocal transmission in opposite propagation directions using symmetry-broken structures has been reported 16, showing unconventional wavefront tailoring in a direction-determined manner. Although nonreciprocal devices could be created to realize direction-dependent manipulation of EM waves by breaking the time-reversal symmetries using magneto-optic materials 10, 11, nonlinear materials 12, 13, and time-variant materials 14, 15, the apparatus used for external control is always complicated and bulky. However, most existing multifunctional metasurfaces do not exploit this design freedom. The requirement of asymmetric wave manipulation widely exists in practical applications such as laser technologies 4, 5, antenna radomes 6, 7, full-duplex communication 8, 9, etc. The wave propagation direction is a vital wave property and its multiplexing endows the metasurface with rich functions in two asymmetric channels. With the development of compact and integrated systems, there are increasing demands on integrating multiple functionalities into a single metasurface. In the past decades, metasurfaces have drawn tremendous attention due to their unprecedented abilities to manipulate electromagnetic (EM) waves at will 1, 2, 3. This work not only offers a common strategy for realizing the reconfigurability of Janus metasurfaces, but also shows possible applications in THz optical information encryption, data storage, and smart windows. Such reconfigurable Janus metasurfaces can achieve asymmetric focusing of THz wave and directional THz holography with free-space image projections, and particularly the information can be manipulated via temperature and incident THz wave direction. Herein, we show that thermally activated THz Janus metasurfaces integrating with phase change materials on the meta-atoms can produce asymmetric transmission with the designed phase delays. Recently, it was demonstrated that Janus metasurfaces could produce distinct responses to EM waves from two opposite incident directions, making multiplexed dynamic manipulation of THz waves possible. Currently, an enormous challenge is to realize directional terahertz (THz) holography. With spectrum tubes, your lesson plan on elements is guaranteed to be remembered, and you can keep them fully charged with our specially designed Spectrum Tube Power Supply.Dynamic manipulation of electromagnetic (EM) waves with multiple degrees of freedom plays an essential role in enhancing information processing. Other outfitters might only offer one or two types of spectrum tubes, but we’ve designed six different styles: Mercury Vapor, Argon Gas, Helium Gas, Nitrogen Gas, Neon Gas, and Hydrogen Gas. These truly awesome tubes turn the smallest molecules into a tremendously large spectacle thanks to an electric field applied between the electrodes at each end. Our diffraction grating glasses are even more illuminating when used in conjunction with our spectrum tubes. Students can wear the diffraction grating glasses or teachers can project the spectrum using an overhead projector or 35mm slide projector for spectrum demonstration purposes, or use in conjunction with colored film gels for additive and subtractive color demonstrations. Our gratings are the principal component in a spectroscope and are used for experiments pertaining to the study of light and color. The quality of the spectrum produced from our gratings is the sharpest possible with a minimum of distracting visual noise. We’re proud to offer Diffraction Grating Glasses in a wide array of styles and linear gratings ranging from, 13,500 lines per inch, linear 500 lines per millimeter, and linear 1000 lines per millimeter. Diffraction Grating Glasses & Spectrum Tubes A Pair Of Glasses To Fit Any Need
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