These Chirality logic gates can able to perform ultrafast logical operation

Modern high-speed mobile networks and Internet of Things devices are generating exponentially increasing amounts of data. This has driven the rapid development of optical computing and processing because of their fully reconfigurable ability and multifunction programmability. All-optical logic gates are indispensable components and have been demonstrated to perform all-optical calculations, including additions and multiplications. Current all-optical logic gates mainly use linear and nonlinear optical effects. With the linear optical approaches, common logic gates have been demonstrated in various optical structures, such as nanowire networks, photonic crystals, plasmonic waveguides, and diffractive metasurfaces. All-optical logic gates are also reported via nonlinear optical effects in different photonic structures, such as silicon resonators, waveguides, and photonic crystal structures.

Similar to different particles such as electrons and molecules, photons have an intrinsic degree of freedom and chirality. Optical chirality, defined by left-handed (σ−) and right-handed (σ+) circularly polarized light, has attracted huge interest in fundamental research and applications. Zhang and his colleagues created a gate from a single layer of molybdenum disulfide—consisting of a sheet of molybdenum atoms sandwiched between two layers of sulfur atoms—placed on top of silica. When the researchers shone two light beams at the gate, the handedness (also known as chirality) of the output beam was determined by the chirality of the input beams. When both input beams had the same chirality, the output was right-handed, but when both input beams had different chirality, the output beam was left-handed. Excellently they have investigated and demonstrated the viability of the concept in bulk silica crystals and atomically thin semiconductors and create ultrafast (<100-fs) all-optical chirality logic gates (XNOR, NOR, AND, XOR, OR, and NAND) and a half adder.

This work is published in the journal of Science Advances on 9th December 2022.

You can find the original copy of this work at Science.

Found out more about this research group at Research group.

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