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Improved inverse design method based on AVM for long-distance dielectric laser accelerators.
Optics Express
|April 12, 2025
Summary
A new inverse design method improves dielectric laser accelerators (DLAs) by accounting for electron velocity changes. This enables sustained particle acceleration over longer distances on chip, overcoming previous limitations.
Area of Science:
- Physics
- Engineering
- Materials Science
Background:
- Dielectric laser accelerators (DLAs) offer high acceleration gradients due to material properties.
- Current inverse design methods (adjoint variable method) neglect electron velocity changes, causing dephasing in long structures.
Purpose of the Study:
- To develop an improved inverse design method for DLAs that incorporates electron velocity variations.
- To enable efficient, long-distance particle acceleration on-chip.
Main Methods:
- Proposed an inverse design approach integrating electron velocity into the objective function.
- Designed a 20 µm DLA using an incident electric field of 1.2 GV/m.
Main Results:
- Achieved an average acceleration gradient of 347 MeV/m for 26.6 keV electrons.
- Sustained electron acceleration across the entire structure, resolving dephasing issues.
- Optimal initial electron energy closely matched the target, validating the method.
Conclusions:
- The improved inverse design method effectively addresses dephasing in DLAs for long-distance acceleration.
- This advancement leads to more efficient and robust on-chip particle acceleration.
- Enables higher energy gains compared to previous DLA designs.
