S07-325 Optical and opto-mechanical devices based on photonic crystals and sub-wavelength grating structures at the tip of an optical fiber An acoustic sensor and a method of fabricating an acoustic sensor are provided. The acoustic sensor includes at least one photonic crystal structure and an optical fiber having an end optically coupled to the at least one photonic crystal structure. Olav Solgaard Onur Kilic Shrestha Mallick Michel Digonnet Gordon Kino Onur Akkaya