@forchel2010], and the generation of polarization entangled photons has been proposed[@beveratos2009; @hughes2009; @senellart2011] and demonstrated[@schmidt2007; @dousse2010]. Quantum information protocols employing c-QED require the implementation of a spin-photon interface, to optically read-out the spin state[@imamoglu2010] and to deterministically generate spin-photon entanglement[@rarity2008; @rarity2009; @bonato2010]. For these schemes and others, the cavity needs to be polarization degenerate and there needs to be good mode-matching between the input light field and the field radiated by the atom[@waks2006; @garnier2007; @vuckovic2007]. Planar photonic crystal (PhC) microcavities are widely studied because of their small mode volumes, $V \sim (\lambda/n)^3$, and high quality factors, Q $\sim10,000-50,000$[@noda2003]. In-plane confinement is achieved by the photonic band gap introduced by the air holes etched in a high-index membrane, while out-of-plane confinement relies on total internal reflection at the membrane-air interface. Historically, PhC cavities are not designed for good mode-matching; however, far-field optimization of PhC devices has been recently an active area of research[@kim2006; @tran2009; @tran2010; @portalupi2010; @pinotsi2011; @haddadi2012]. In particular, the H1 defect[@shirane2007], formed by removing one hole from a triangular lattice of air holes, is a promising candidate for the applications described because of its orthogonally-polarized, spectrally-degenerate dipole modes. Although fabrication imperfections lift the degeneracy of the two dipole modes, 