A Continuous-Field Photonic Chip Architecture: 3D In-Memory Computing with Dynamic Weight Modulation via PHAT

Update Highlights for B³D‑HPA v3. 47 Wavefront Precision Refinement: Optimized the phase-encoding algorithm based on the composite construction f (n) = g (n) + h (n), achieving higher reconstruction fidelity in heuristic potential field mapping. PHAT Protocol Enhancement: Improved the deterministic mapping efficiency and addressing robustness of the Physical Hash Address Table (PHAT), enabling more reliable navigation in complex 3D photonic grid structures. Thermal-Stress Decoupling: Introduced enhanced isotropic stress distribution logic to suppress thermally induced phase drift, improving stability during high-intensity continuous optical writing operations. Interface Standardization: Refined the tri-logical address interface design for tighter synchronization and interoperability between CMOS control systems and photonic computing layers. Overall System Stability: Integrated the above improvements to strengthen long-term operational stability, repeatability, and scalability of the 3D continuous-field photonic computing architecture. Technical Briefing: New Features in B³D-HPA Architecture V3. 46 Title: B³D-HPA: Continuous-Field Photonic Computing Architecture — Mechanisms, Engineering Implementation, and Computing Paradigms (V3. 46) Author: XiangNing Chen (Independent Researcher) 1. The "Silicon-Silica" Hybrid Interface (The ADC Collapse) The most critical engineering addition in V3. 46 is the formalization of the Photodetector (PD) Array and Digital Reconstruction Layer. Mechanism: It defines how the continuous optical wavefield evolution within the SugarCube collapses into standardized binary digital signals. Paradigm Shift: By utilizing a large-format PD array (4096×4096), V3. 46 achieves a "one-shot" output of complex physical evolution results. This bypasses the traditional von Neumann "memory wall" by using the PHAT (Physical Hash Address Table) as a real-time logical interpreter, allowing silicon-based systems to manage high-level tasks while the silica core executes heavy-duty parallel computation. 2. Physical-Level Ray Tracing and 3D Rendering V3. 46 introduces a transformative application for consumer-grade hardware: Physical Ray Tracing. Direct Evolution: Unlike traditional GPUs that numerically simulate ray-triangle intersections (consuming hundreds of watts), the B³D-HPA architecture allows ray tracing to occur as a natural physical phenomenon within the 3D refractive-index grid. Zero-Latency Rendering: Real-time camera movement is achieved by simple incident wavefront adjustment. This allows for photorealistic rendering with ambient occlusion and global illumination at the speed of light, with near-zero energy consumption. 3. "Bone-Marrow Separation" Strategy for Non-Volatile Stability To ensure long-term reliability without active cooling, V3. 46 defines a hybrid physical encoding strategy: The "Bone" (Macroscopic Solidification): Permanent structural modification via femtosecond laser inscription forms the core logic backbone. The "Marrow" (Microscopic Self-Healing): Low-power dual-wavelength UV pumping manages metastable energy-level tuning for weight fine-tuning and environmental compensation. Outcome: This layered approach ensures that even if the "soft" layer drifts slightly over time, the underlying computational skeleton remains stable, achieving a self-healing homeostasis. 4. Strategic De-escalation of Capital Expenditure V3. 46 provides a direct message to industry leaders: The era of "brute-force" scaling (multi-billion dollar investments in sub-2nm nodes and massive cooling infrastructure) has reached a point of diminishing returns. Cost Efficiency: By shifting from "extreme manufacturing precision" to "adaptive physical-layer mapping, " B³D-HPA redefines yield as "detectability. " Environment Immunity: The removal of active thermal stabilization requirements offers a pathway to reduce infrastructure CAPEX by several orders of magnitude. Summary of Improvements in V3. 45 This version establishes a systematic multi-layer thermal drift mitigation scheme based on intrinsic material advantages. Fused silica is defined as the primary mass-producible medium, with sapphire as a high-performance option, both of which are quantitatively compared with silicon crystal in terms of thermal expansion and thermo-optic effect. The scheme highlights the significant performance gap across multiple orders of magnitude in thermal stability, without relying on complex packaging or active stabilization. Phase-encoded heuristic search is fully integrated, mapping the A* algorithm to optical phase accumulation and interference. The architecture emphasizes interdisciplinary system integration, with clear physical principles and strong engineering feasibility. By employing rare-earth-doped dielectric media and physical hash addressing, the architecture achieves robust, repeatable, and reconfigurable continuous-field optical computing in realistic ambient environments. Technical Supplement for B³D-HPA V3. 44 Heading: Real-time Phase Calibration via Pilot-Beam Synchronization A critical challenge in volumetric optical computing is the susceptibility of the 3D silica matrix to environmental thermal fluctuations, which induce deterministic yet complex phase-shifting (e. g. , a drift of up to 15. 8 wavelengths over a 60^C gradient). V3. 44 introduces a high-fidelity Pilot-Beam Calibration mechanism. By injecting a non-computational reference laser (the 'Pilot-Beam') into the same disordered manifold, the system captures real-time volumetric transformations as a global phase-shift signature. This signature is then utilized by the Refraction Compiler to apply an inverse-phase compensation at the Spatial Light Modulator (SLM) input. This closed-loop hardware-software synergy ensures that the logical consistency of the A Search Algorithm* remains invariant despite physical medium expansion. By shifting the burden of environmental stability from the material fabrication layer to the algorithmic modulation layer, V3. 44 achieves industrial-grade robustness on low-cost, mass-produced doped silica substrates. Unlike 2D waveguide constraints, B³D-HPA utilizes the full 3D spatial coherence of the silica substrate, providing a robust physical platform for complex interference patterns required in high-dimensional computing.