Fig. 1: Schematic illustration of HWPs-based polarization-selective unidirectional and bidirectional DNN. | Nature Communications

Fig. 1: Schematic illustration of HWPs-based polarization-selective unidirectional and bidirectional DNN.

From: Polarization-selective unidirectional and bidirectional diffractive neural networks for information security and sharing

Fig. 1

When x- or y-polarized THz waves are incident, the system operates as a unidirectional classifier in the forward or backward direction, respectively. Under 45°-LP waves, the system functions bidirectionally, allowing classification in both forward and backward directions. The top-right inset depicts the concept of polarization-selective DNN for THz waves incident from either the forward or backward direction with specific polarization states. The bottom-left inset shows the DNN architecture used to map the designed metasurfaces.

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