Fig. 3: Laser “drawing” of the “visual shapes” and their sorting.
From: On-chip phonon-magnon reservoir for neuromorphic computing
a Encoding the visual shapes by sequential relative shift of the write and read spots and the following characterization of the integrated waveform. The waveform \({M}_{{{{{{\rm{shape}}}}}}}\left(t\right)\) is the sum of the waveforms \({M}_{i,j}(t)\) measured in the corresponding discrete positions forming the selected trajectory normalized to their number, \(l\). The trajectory illustrated on the left corresponds to the symbol ‘L’. The respective exemplary waveform, \({M}_{{{{{{\rm{L}}}}}}}(t),\)(as measured) is shown in the central frame. b Selected writing trajectories (left column) and the idealized artificially constructed images of the drawn symbols (right column). The micrographs are obtained by capturing images of the write laser spot on the nanograting surface sequentially shifted along the respective trajectory. The images with the spots forming the corresponding visual shape are overlapped in a graphic redactor. c Exemplary noise-free readout waveforms integrated over the respective trajectories. d Distribution of symbols in the parameter space spanned by the Shannon entropy, the skewness, and the variance, obtained from unfiltered magnon readouts for ten drawn trajectories for each symbol.
