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We developed a technique that enables to replace a metallic waveguidecladding with a low-index (n $\sim$ 1.4) material - CaF2 or BaF2 - that inaddition is transparent from the mid-IR up to the visible range: elevatedconfinement is preserved while introducing an optical entryway through thesubstrate. Replacing the metallic backplane also allows double-side patterningof the active region. Using this approach, we demonstrate strong light-mattercoupling between an intersubband transition (lambda $\sim$ 10 microns) and adispersive resonator, at 300 K and at 78 K. Finally, we evaluate the potentialof this approach as a platform for waveguiding in the mid-IR spectral range,with numerical simulations that reveal losses in the 1-10 cm$^{-1}$ range.

III-V on CaF2: a possible waveguiding platform for mid-IR photonic devices