Photonic crystal slab cavities were investigated for increased light–matter interaction based on selective placement of sublattice hole sized defect holes inside L3 cavities. A multiple-hole defect (MHD) consisting of three defect holes placed in the regions of highest cavity mode field intensity were demonstrated through finite-difference time-domain simulations and experiments to exhibit the strongest light–matter interaction without introducing significant scattering losses. Compared to an L3 cavity without defect holes, these strategically designed three-hole MHD cavities presented higher quality factor and more than double the resonance wavelength shift upon exposure to a thin oxide and two small chemical molecules.
© 2012 Optical Society of America
Original Manuscript: February 29, 2012
Revised Manuscript: May 25, 2012
Manuscript Accepted: June 1, 2012
Published: July 10, 2012
Christopher Kang, Sharon M. Weiss, Yurii A. Vlasov, and Solomon Assefa, "Optimized light–matter interaction and defect hole placement in photonic crystal cavity sensors," Opt. Lett. 37, 2850-2852 (2012)