Abnormal length-dependent thermal transport in silicon nitride nanoribbons by surface phonon polaritons
Bibliographic record
Abstract
Surface phonon polaritons (SPhPs) are hybrid excitations arising from the coupling of mid-infrared photons with optical phonons, generating evanescent waves that propagate along the surfaces of polar dielectric materials. Owing to their long wavelengths and extended propagation lengths, SPhPs are particularly promising for enhancing the heat dissipation in micro- and nano-electronic devices. In this study, we fabricated silicon nitride (SiNx) nanoribbons and transferred them onto suspended micro-platforms to systematically investigate their thermal transport property. The thermal conductivity measurements were conducted in a temperature range of 300–480 K for SiNx nanoribbons with varying lengths. A distinct length-dependent enhancement in thermal conductivity is observed, indicative of the quasi-ballistic transport behavior. We attribute this enhancement to the contribution of propagating SPhPs along the surfaces of the polar SiNx nanoribbons. Further quantitative analysis reveals that the SPhP-mediated component constitutes a substantial fraction of the total in-plane thermal conductance for the 70 μm-long nanoribbon at 480 K. Our findings provide direct evidence that SPhPs act as effective heat carriers in low-dimensional polar dielectric systems, providing valuable insights for optimizing the heat dissipation in next-generation microelectronics and silicon photonics.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".