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ARROW waveguide
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<p>In <a href="/facts/Optics/p0vq4S1T">optics</a>, an ARROW (<a href="/facts/Anti-resonant/RYWYlEpG">anti-resonant</a> reflecting optical <a href="/facts/Waveguide/tJS9Y0GH">waveguide</a>) is a type of waveguide that uses the principle of <a href="/facts/Thin-film_interference/UScpq8NL">thin-film interference</a> to guide light with low loss. It is formed from an anti-resonant <a href="/facts/Fabry%E2%80%93P%C3%A9rot/n949LwQD">Fabry–Pérot</a> reflector. The optical mode is leaky, but relatively low-loss propagation can be achieved by making the Fabry–Pérot reflector of sufficiently high quality or small size. </p>