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Express"],"published-print":{"date-parts":[[2026,1,26]]},"abstract":"<jats:p>This study demonstrates a dynamically programmable metasurface leveraging germanium-antimony-tellurium (GST) for multi-channel holographic and optical encryption. By integrating a GST thin film with gallium arsenide nanostructures, non-volatile switching between near-field reflection and far-field diffraction modes is achieved via reversible GST phase transitions. Under y-polarized illumination in the crystalline state, the metasurface produces near-field amplitude-encoded images (\u201cA\u201d, \u201cB\u201d, \u201cC\u201d) at wavelengths of 400\u2005nm, 600\u2005nm, and 800\u2005nm. Conversely, under x-polarized illumination in the amorphous state, it projects far-field phase-modulated holograms (\u201cX\u201d, \u201cY\u201d, \u201cZ\u201d) at 1064\u2005nm, 1450\u2005nm, and 1550\u2005nm. By leveraging wavelength, polarization, and GST phase state, a nested encryption architecture is established that dynamically associates code-chips to map plaintext to ciphertext, thereby substantially enhancing security. 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