# Free-space and periodic optics

Periodic absorption and wavefront shaping with field and focal-plane observables.

[← Back to the complete example atlas](../index.md)

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:::{grid-item-card} Dielectric metasurface absorber — periodic THz resonator
:link: ../notebooks/metasurface_absorber
:link-type: doc

<span class="metric-pass">PASS</span> · executed notebook · forward · R
:::
:::{grid-item-card} Geometric-phase metalens — focal distance and spot size
:link: ../notebooks/metalens
:link-type: doc

<span class="metric-pass">PASS</span> · executed notebook · forward · focal_distance_um
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```{toctree}
:hidden:
:maxdepth: 1

../notebooks/metasurface_absorber
../notebooks/metalens
../cases/device_metasurface_absorber
../cases/device_metalens
```