Femtosecond laser writing of phase-tuned volume gratings for symmetry control in 3D photonic crystal holographic lithography
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Volume diffractive optical elements promise widespread application in laser beam shaping, imaging and optical data storage by structuring refractive index modulation in the third axial dimension. Femtosecond laser direct writing has been exploited inside fused silica to assemble multiple 1D grating layers on Talbot planes and overcome the inherent weak diffraction efficiency otherwise found in low-contrast volume gratings. Here, we extend laser structuring from linear (1D) to orthogonally crossed (2D) gratings with the aim to write 3D photonic crystal templates in photoresist by 3D interference lithography. The formation of crossed grating structures present challenges in balancing the efficiency of diffraction orders owing to blazing and index overwriting effects requiring compensation by tuning the grating design and laser power exposure. In this way, six-layer grating designs have been fabricated and applied to exposure of thick photoresist, enabling the formation of 3D photonic crystal templates with bicontinuous structure. A systematic offsetting of orthogonal grating layers to establish phase offsets over 0 to π/2 range presents a precise means for controlling the photonic crystal structure symmetry between body centered tetragonal (BCT) and woodpilelike tetragonal (wTTR).
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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 | 0.000 | 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 it