On-chip phononic time lens

Abstract

The ability to manipulate phonon waveforms in continuous media has attracted significant research interest and is crucial for practical applications ranging from biological imaging to material characterization. Although several spatial focusing techniques have been developed, these systems require sophisticated artificial structures, which limit their practical applications. This is because the spatial control of acoustic phonon waves is not as straightforward as photonics so there is a strong demand for an alternative approach. Here we demonstrate a phononic time lens in a dispersive one-dimensional phononic crystal waveguide, which enables the temporal control of phonon wave propagation. Pulse focusing is realized at a desired time and position with chirped input pulses that agree perfectly with the theoretical prediction. This technique can be applied to arbitrary systems and will offer both an improvement in time and spatial sensing resolution and allow the creation of a highly intense strain field, enabling the investigation of novel nonlinear phononic phenomena such as phononic solitons and rogue waves.

9 pages, 7 figures

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• Real-space characterization of cavity-coupled waveguide systems in hypersonic phononic crystals
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• Design of GaAs-based valley phononic crystals with multiple complete phononic bandgaps at ultra-high frequency
• Tunnelling of transverse acoustic waves on a silicon chip
• High-resolution acoustic field mapping of GHz phononic crystals with atomic force microscopy
• Directional emission in an on-chip acoustic waveguide
• Electrically-tunable graphene nanomechanical resonators
• Buckling-induced quadratic nonlinearity in silicon phonon waveguide structures
• Possible realization of a phononic tsunami in a wedge-shaped sample