Prediction & Protocol Ledger: Long-Lived Harmonic State Induction in Photodiodes Richard J. Reyes - December 16, 2025 GitHub Repository: https://github.com/rickyjreyes/photodiode Overview This ledger records a predictive, protocol-level claim that a sub-minute optical excitation applied to a standard silicon photodiode can induce a long-lived, discrete harmonic electrical state that persists for weeks to months after all illumination and motion cease. The document formalizes a deterministic induction procedure involving ultraviolet illumination combined with controlled angular modulation of concurrent visible light. The claimed phenomenon is characterized by a sharp state transition, a non-random harmonic spectrum, and temporal persistence far exceeding the excitation duration. This ledger is intentionally pre-confirmatory. It does not report experimental results or propose a microscopic mechanism. Its purpose is to establish priority on causality, inducibility, and falsifiability prior to further experimentation or independent replication. Claimed Phenomenon A brief optical trigger (< 60 s) produces a persistent electrical state in a photodiode that: is absent prior to excitation, does not require continued power or illumination, exhibits stable harmonic frequency ratios (n/k structure), and remains detectable for ≥ 30 days (with observed persistence extending to multiple months). The transition is consistent with a threshold or lock-in event rather than linear accumulation or slow relaxation. Protocol Summary The ledger specifies: Device conditions (virgin, dark-stored silicon photodiode), Optical excitation parameters (UV wavelength range, duration), Concurrent visible illumination, Controlled angular / torsional modulation during excitation, A critical termination order governing state lock-in. The protocol is written to be directly executable without interpretive steps. Pre-Declared Signature If the claim is correct, replication of the protocol must produce: A discrete state transition from baseline to structured output, A harmonic spectral ladder with fixed frequency ratios, Long-term persistence without further excitation, Spectral invariance under power cycling, darkness, and quiescent conditions. These observables are declared in advance, preventing post-hoc fitting. Falsification Conditions The claim is explicitly falsified if: A virgin photodiode does not enter a harmonic state under the protocol, The signal exhibits only broadband noise or monotonic exponential decay, The effect is not reproducible on multiple devices, The signal vanishes immediately when excitation ceases. These conditions bound the claim and render it experimentally decidable. Relation to Prior Work This ledger complements prior observational and theoretical work by the author on long-lived resonance phenomena and curvature-locked wave dynamics, but does not depend on or assert any specific theoretical framework. Interpretation: including semiconductor-level mechanisms, field-matter coupling, or geometric/topological models, is explicitly deferred. Significance This document establishes priority on an inducible physical effect, not on its explanation. If confirmed, the phenomenon implies the existence of a non-volatile, geometry-sensitive memory state accessible via brief optical excitation in standard photodiodes. Regardless of mechanism, such behavior lies outside conventional linear electronic response and warrants focused experimental investigation. Keywords photodiode; persistent electrical states; harmonic spectrum; optical excitation; ultraviolet illumination; angular modulation; long-lived resonance; non-volatile states; protocol registration; falsifiable prediction; state induction; threshold dynamics; experimental ledger. Author & Contact Author: Richard J. ReyesORCID iD: 0009-0005-5975-8718Email: reyes.ricky30@gmail.com