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Adjoint Algorithm Design of Selective Mode Reflecting Metastructure for BAL Applications.
- Source :
-
Nanomaterials (2079-4991) . May2024, Vol. 14 Issue 9, p787. 17p. - Publication Year :
- 2024
-
Abstract
- Broad-area lasers (BALs) have found applications in a variety of crucial fields on account of their high output power and high energy transfer efficiency. However, they suffer from poor spatial beam quality due to multi-mode behavior along the waveguide transverse direction. In this paper, we propose a novel metasurface waveguide structure acting as a transverse mode selective back-reflector for BALs. In order to effectively inverse design such a structure, a digital adjoint algorithm is introduced to adapt the considerably large design area and the high degree of freedom. As a proof of the concept, a device structure with a design area of 40 × 20 μm2 is investigated. The simulation results exhibit high fundamental mode reflection (above 90%), while higher-order transverse mode reflections are suppressed below 0.2%. This is, to our knowledge, the largest device structure designed based on the inverse method. We exploited such a device and the method and further investigated the device's robustness and feasibility of the inverse method. The results are elaborately discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ALGORITHMS
*ENERGY transfer
*DEGREES of freedom
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 14
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Nanomaterials (2079-4991)
- Publication Type :
- Academic Journal
- Accession number :
- 177179865
- Full Text :
- https://doi.org/10.3390/nano14090787