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  "publishedAt": "2026-06-13T00:28:03.000Z",
  "site": "https://mander.xyz",
  "tags": [
    "Science",
    "cm0002",
    "0 comments",
    "https://www.researching.cn/articles/OJ1c8af7e2b84132f7",
    "spie.org - Photon-driven synapse advances low-power neuromorphic systems",
    "SPIE",
    "SPIE reports",
    "Advanced Photonics 8(4) 046001",
    "SPIE news article",
    "SPIE News",
    "Advanced Photonics (SPIE Digital Library)"
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  "textContent": "submitted by cm0002 to science\n7 points | 0 comments\nhttps://www.researching.cn/articles/OJ1c8af7e2b84132f7\n\n> # Fully Photon-Modulated Synaptic Devices with Bidirectional Plasticity\n>\n> This 2026 paper by Y. Yan et al., published in _Advanced Photonics_ , presents an artificial synapse that operates entirely with light, requiring no electrical signals at any stage.\n>\n> _Image: spie.org - Photon-driven synapse advances low-power neuromorphic systems_\n>\n> The device uses a **rare-earth-doped long-afterglow crystal** that stores optical information as trapped charge carriers. According to SPIE, the system achieves bidirectional plasticity through two mechanisms:\n>\n>   * **UV light** produces paired-pulse facilitation (excitatory response), where a second pulse yields stronger output because earlier excitation partially fills trap states.\n>   * **Near-infrared light** produces paired-pulse depression (inhibitory response), as the first pulse empties trapped carriers, weakening subsequent responses.\n>\n\n>\n> The researchers developed a physical model tracking how carriers are generated, trapped, and released over time, explaining the history-dependent behavior without electrical control.\n>\n> For practical demonstration, the team paired the crystal with a silicon imaging sensor to build a prototype neuromorphic camera. This in-sensor processing enhanced contrast and suppressed noise directly at capture. A neural network modeled on the device’s behavior achieved **95.99% accuracy** on handwritten digit classification after denoising, compared to roughly 78% without it, SPIE reports.\n>\n> The device currently operates on millisecond-to-second timescales, comparable to biological visual processing. The authors suggest scaling down and modifying material properties could improve both speed and energy efficiency.\n>\n> The full Gold Open Access paper is available at Advanced Photonics 8(4) 046001 (doi: 10.1117/1.AP.8.4.046001). For a readable summary, the SPIE news article provides the most complete overview.\n>\n> Sources: SPIE News, Advanced Photonics (SPIE Digital Library)",
  "title": "Fully photon-modulated synaptic devices with bidirectional plasticity for neuromorphic vision and recognition"
}