[ Instrument R&D of Instrumentation Network ] Recently, Yang Yan, associate researcher of the Integrated Circuit Pilot Technology R&D Center of Institute of Microelectronics, Chinese Academy of Sciences, and Wuhan University Professor Zheng Guoxing's research group, Wuhan Institute of Posts and Telecommunications Co., Ltd., etc., have made research in the field of silicon-based supersurfaces Progress, a technology that facilitates spatial frequency multiplexing is proposed. In a spatial area overlapping on a silicon-based supersurface, two different optical images are recorded simultaneously using different spatial frequency information, and digital filters can be used to efficiently Of separation. This achievement adds more multiplexing carriers for the transmission, processing and storage of optical information, and opens up a brand new way for supersurface information multiplexing. It is expected to be used in high-end anti-counterfeiting, information security, optical information coding, compact display, and optical storage. And other fields have important applications.
The digital filter's method for filtering the signal is: use a digital computer to process the digital signal, and the processing is to calculate according to the pre-programmed program. The principle of the digital filter is shown in the figure, and its core is the digital signal processor.
If you use a general-purpose computer, you can write a program at any time to perform signal processing, but the processing speed is slow. If a dedicated computer chip is used, it is an integrated circuit made according to an arithmetic method, and the connection signal can be processed. The processing speed is fast, but the function is not easy to change. If a programmable computer chip is used, then what function the machine can have with whatever program is loaded. This kind of programmable chip has many advantages, it is the first choice of modern electronic products. If the analog signal is processed, an analog-to-digital converter and a digital-to-analog converter need to be added.
An analog-to-digital converter, or A/D converter, or ADC for short, usually refers to an electronic component that converts an analog signal to a digital signal. The usual analog-to-digital converter converts an input voltage signal into an output digital signal. Since the digital signal itself has no practical significance, it only represents a relative size. Therefore, any analog-to-digital converter requires a reference analog quantity as the conversion standard. The most common reference standard is the maximum convertible signal size. The output digital quantity indicates the size of the input signal relative to the reference signal.
The super-surface material is a two-dimensionally distributed array of sub-wavelength structures, which can effectively control the phase, amplitude and light intensity of light waves. The optical response of metasurfaces usually depends on dispersion and polarization, so it is possible to develop information multiplexing systems that utilize wavelength and polarization characteristics. However, most hypersurface multiplexing technologies are only implemented in the spatial domain. This study verified a space-frequency multiplexed silicon-based supersurface chip through experiments. Two completely different holograms were overlapped at high and low spatial frequencies and recorded on the same silicon-based supersurface chip. Holographic pictures can be separated using two digital Gaussian filters. The experiment also verified the space-frequency multiplexing technology through the super-surface nano-imprint, and realized a high-fidelity demultiplexing of a picture superimposed by two pictures.
Source: Institute of Microelectronics, Encyclopedia
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