Amplitude-phase dual-channel encrypted acoustic meta-holograms
Résumé
Encrypted acoustic meta-holograms have potential applications in confidential acoustic information communication, noise control, acoustic cloaking, and acoustic illusion, etc.
Conventional encrypted optical and acoustic meta-holograms only focus on the encrypted hologram in a single channel, viz. modulating spatial amplitude to project a holographic image. Here, we propose the concept of amplitude-phase dual-channel encrypted acoustic meta-hologram, capable of generating, encrypting, and decrypting both amplitude and phase holographic images. This unique concept of "phase holographic image" introduces a new degree of freedom for meta-holograms, leading to dual-channel encrypted acoustic holography. Acoustic metasurface with simultaneous amplitude and phase modulations is employed to realize this dual-channel encryption. Our findings might offer the possibility to increase the capacity of the encrypted acoustic meta-holograms, which can lead to practical applications in, for example, multi-channel acoustic field communications, complex noise control and acoustic illusions.
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