Fig. 6: Rotating metasurface waveguide for rotating acoustic spin as a phase modulator. | Nature Communications

Fig. 6: Rotating metasurface waveguide for rotating acoustic spin as a phase modulator.

From: Realization of acoustic spin transport in metasurface waveguides

Fig. 6

a Rotating the boundaries of metasurface waveguide with angular velocity Ω will lead to rotating spin texture that resembles the motion of electron spin precession under an effective “magnetic field” Ω. The final rotation angle will be θ = ΩL, where L is the length of waveguide. b The experimentally measured acoustic additional phase γ at 2.85 and 2.9 kHz with the standard deviation as the error bar. The theoretical prediction can be represented by \(\gamma =\frac{k{R}_{0}^{2}}{2L}{\theta }^{2}\), where k = 24. 5°/cm is the measured wave vector for 2.9 kHz, L = 60 cm and R0 = −1.4 cm (See Supplementary Note 3).

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