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We demonstrate ultrasound detection with 500-$\mu\mathrm{{m}}$-diameterphotonic-crystal slab (PCS) sensors fabricated from CMOS-compatible technology.An ultrasound signal impinging a PCS sensor causes a local modulation of therefractive index (RI) of the medium (water) in which the PCS is immersed,resulting in a periodic spectral shift of the optical resonance of the PCS. Theacoustic sensitivity is found to scale with the index sensitivity $S$ andquality factor $Q$. A noise equivalent pressure (NEP) of 650 Pa with averaging(7.4 Pa$/\sqrt{\mathrm{Hz}}$) and relative wavelength shifts of up to4.3$\times10^{-5}$ MPa$^{-1}$ are measured. The frequency response of thesensors is observed to be flat from 1-20 MHz, with the range limited only byour measurement apparatus.

Refractive-Index-based ultrasound sensing with photonic crystal slabs