We experimentally demonstrate high quality factor dual-polarized photonic crystal nanobeam cavities. The free-standing nanobeams are fabricated in a 500 nm thick silicon layer, and are probed using both tapered optical fiber and free-space resonant scattering set-ups. We measure Q factors greater than 10(4) for both transverse magnetic (TM) and transverse electric modes, and observe fiber transmission drops as large as 1-T = 0.8 at the TM mode resonances. (C) 2011 American Institute of Physics. [doi:10.1063/1.3568897]
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