Figure 2 | Schematic and performance of the frequency-dependent encrypted display. (IMAGE)
Caption
Figure 2 | Schematic and performance of the frequency-dependent encrypted display. a Functional unit for frequency-dependent quaternary encoding. Electron beam impinging positions are located at four inner corners and the center of the nanoantenna, which are marked with five points on the pseudo-color SEM image. b Angular patterns of the dichromatic components in quaternary encoding. c Image of the color routers and Field-Programmable Gate Array controller. d Photograph of electron source film and gold electrodes. e The image of electron source flake and Au cross nanoantenna array fabricated by electron-beam lithography. f, g Two-dimensional encrypted display of capital letters “C” and “R”. In the capital letter “C”, the measured splitting patterns of dichromatic components output capital letters “B”, “I” and “T”, respectively. In the capital letter “R”, three character strings are output as capital letters “M”, “R” and “D”, respectively.
Credit
by Cheng Chi, Zhibo Dang et al.
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CC BY