Dj532

We used the chaotic Mackey-Glass time-series data for a moving signal, x(t), generated by the discrete equation (63 (link)–66 ) $$x(t+1)=c\cdot x(t)+\left[\frac{a\cdot x(t-d)}{b\cdot x{(t-d)}^e}\right]$$ where a (0.05), b (0.2), c (0.9), d (17), and e (10) are constants. The first 100 data points were removed to achieve a stable oscillating chaotic signal. The remaining 400 data points were then normalized between 0 and 1. In this experiment, the output of the ultrasound distance sensor was between 0 and 0.8 V, but further distance ranging is possible when the larger space is available, reaching the operating voltage of the ultrasound distance sensor (5.5 V). Thus, within the maximum possible voltage range of the sensor (5.5 V), we additionally amplified the output signal (59-179, Edmund) that reaches up to 4 V only for the visualization purpose (laser beam movement) as recorded in movie S1. The I_DS output signals were interpolated from 200 to 400 data points and normalized to match the dimensions with that of x(t). The tracking spot was illuminated by a 532-nm diode laser (DJ532, Thorlabs).

All electrical measurements were performed using a semiconductor analyzer (B1500A, Keysight). The devices were illuminated using a diode laser (DJ532, Thorlabs) with a wavelength of 532 nm, where the incident power was controlled by a neutral density filter.