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High-energy $\gamma\gamma$ colliders constitute a potential running mode offuture $e^+ e^-$ colliders such as the ILC and CLIC. We study the sensitivityof a high-energy $\gamma\gamma$ collider to the Higgs portal scenario to ahidden sector above the invisible Higgs decay threshold. We show that such$\gamma\gamma$ collisions could allow to probe the existence of dark sectorsthrough the Higgs portal comparatively more precisely than any other plannedcollider facility, from the unique combination of sizable cross-section withclean final state and collider environment. In addition, this search couldcover the singlet Higgs portal parameter space yielding a first-orderelectroweak phase transition in the early Universe.

Shining light through the Higgs portal with $\gamma\gamma$ colliders