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We present a 1.16-\mum-radius disk cavity with ultrahigh quality (Q) factorby embedding the disk into a sunflower-type circular photonic crystal (CPC).The band gap of the CPC reduces the bending loss of the whispering-gallery modeof the disk, leading to a simulated Q of 10^7, at least one order of magnitudehigher than a bare disk of the same size. The design is experimentally verifiedwith a record high loaded Q of 7.4 \times 10^5 measured from an optimizeddevice fabricated on a silicon-on-insulator substrate.

A 1.16-{\mu}m-radius disk cavity in a sunflower-type circular photonic crystal with ultrahigh quality factor