Wang YL, Min CJ, Zhang YQ, Yuan XC. Spatiotemporal Fourier transform with femtosecond pulses for on-chip devices. Opto-Electron Adv 5, 210047 (2022). doi: 10.29026/oea.2022.210047
Citation: Wang YL, Min CJ, Zhang YQ, Yuan XC. Spatiotemporal Fourier transform with femtosecond pulses for on-chip devices. Opto-Electron Adv 5, 210047 (2022). doi: 10.29026/oea.2022.210047

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Spatiotemporal Fourier transform with femtosecond pulses for on-chip devices

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  • On-chip manipulation of the spatiotemporal characteristics of optical signals is important in the transmission and processing of information. However, the simultaneous modulation of on-chip optical pulses, both spatially at the nano-scale and temporally over ultra-fast intervals, is challenging. Here, we propose a spatiotemporal Fourier transform method for on-chip control of the propagation of femtosecond optical pulses and verify this method employing surface plasmon polariton (SPP) pulses on metal surface. An analytical model is built for the method and proved by numerical simulations. By varying space- and frequency-dependent parameters, we demonstrate that the traditional SPP focal spot may be bent into a ring shape, and that the direction of propagation of a curved SPP-Airy beam may be reversed at certain moments to create an S-shaped path. Compared with conventional spatial modulation of SPPs, this method offers potentially a variety of extraordinary effects in SPP modulation especially associated with the temporal domain, thereby providing a new platform for on-chip spatiotemporal manipulation of optical pulses with applications including ultrafast on-chip photonic information processing, ultrafast pulse/beam shaping, and optical computing.
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