Frequency down-conversion in GaAs enhanced by optical antennas
Bibliographic record
Abstract
Summary form only given. The nonlinear optical response of a material is relatively weak compared to the linear response, but nonlinear responses can be enhanced by increasing the power of the input frequencies to be mixed. Similarly, conversion efficiency can be enhanced by increasing the interaction volume of the structure. Phase-matching, which is a momentum conservation, is important for increasing the energy exchange between the waves. Fulfilling the phase-matching along the direction of the propagating waves will increase the power of the resulting wave of the mixing. GaAs is a cubic structure lattice which has isotropic optical properties. Because it is not possible to achieve birefringence phase-matching using GaAs, an artificial birefringence medium is made using other layers of different materials to obtain the phase-matching. Quasi-phase-matching is also possible by modulating the second-order susceptibility χ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(2)</sup> along the direction of the propagation to form grating. The two major techniques are domain-reversal quasi-phase-matching and domain-disordered quasi-phase-matching. This study focuses on frequency down-conversion in the mid-infrared range. Frequency down-conversion is an essential technique for generating mid-infrared optical frequencies when it is not possible to generate them by conventional sources. We study phase-matching using effective permittivity by inclusions of negative permittivity materials into GaAs, and investigate materials such as metals or doped GaAs. Gold is selected to be the inclusion material into GaAs as a host medium. Using the Maxwell-Garnett model of effective permittivity theories, we form the desired effective permittivity to obtain phase-matching. A one-dimensional optical antenna array is selected for the inclusions. By changing the inclusion volume fraction and depolarization factor of cylindrical optical antennas, we can specify effective permittivity in a certain direction. To simplify the analytical analysis of the problem, we assume the depression relations of the propagated waves in a bulk medium of GaAs. Omitting the power calculations, we achieve phase-matching for certain wavelengths, depending on the volume inclusions and deportation factors of the antennas rods. This result promises that phase-matching is possible in channel waveguides.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 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".