Antireflection by design in bilayer metasurfaces
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913146490322944 |
|---|---|
| author | Oh, Jaewon Cassara, Davide Palmieri, Alfonso Piatti, Lorenzo Rodrigues, Janderson Rocha Dorrah, Ahmed H. Dainese, Paulo Capasso, Federico |
| author_facet | Oh, Jaewon Cassara, Davide Palmieri, Alfonso Piatti, Lorenzo Rodrigues, Janderson Rocha Dorrah, Ahmed H. Dainese, Paulo Capasso, Federico |
| contents | Antireflection coatings are ubiquitous in optical systems, where they maximize transmission and suppress undesirable reflections by impedance-matching uniform interfaces. Extending this principle to metasurfaces, however, is fundamentally more challenging because wavefront control requires a library of geometrically distinct meta-atoms, each locally imposing a prescribed phase that is tethered to its transmittance. Here, we show that vertical integration resolves this constraint by allowing bilayer meta-atoms to operate simultaneously as a phase shifter and an impedance-matching stack. Using an effective thin-film model, we derive a design rule that links the effective indices of two independently patterned layers and identifies antireflective bilayer libraries with full $0$-$2π$ transmission-phase coverage. We realize this concept in a free-standing TiO$_2$/TiO$_2$ metalens operating at 1310 nm, which suppresses reflectance below that of bare glass while preserving diffraction-limited focusing. These results establish bilayer metasurfaces as a framework for co-engineering optical impedance and wavefront response at the meta-atom level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_19970 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Antireflection by design in bilayer metasurfaces Oh, Jaewon Cassara, Davide Palmieri, Alfonso Piatti, Lorenzo Rodrigues, Janderson Rocha Dorrah, Ahmed H. Dainese, Paulo Capasso, Federico Optics Antireflection coatings are ubiquitous in optical systems, where they maximize transmission and suppress undesirable reflections by impedance-matching uniform interfaces. Extending this principle to metasurfaces, however, is fundamentally more challenging because wavefront control requires a library of geometrically distinct meta-atoms, each locally imposing a prescribed phase that is tethered to its transmittance. Here, we show that vertical integration resolves this constraint by allowing bilayer meta-atoms to operate simultaneously as a phase shifter and an impedance-matching stack. Using an effective thin-film model, we derive a design rule that links the effective indices of two independently patterned layers and identifies antireflective bilayer libraries with full $0$-$2π$ transmission-phase coverage. We realize this concept in a free-standing TiO$_2$/TiO$_2$ metalens operating at 1310 nm, which suppresses reflectance below that of bare glass while preserving diffraction-limited focusing. These results establish bilayer metasurfaces as a framework for co-engineering optical impedance and wavefront response at the meta-atom level. |
| title | Antireflection by design in bilayer metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2605.19970 |