We present a simple analytic formalism to explain the unique resonance phenomenon in subwavelength high- contrast gratings (HCG). We show that the resonances are due to strong coupling between two surface-normal waveguide array modes resulting from abrupt and large index contrast. Simple expression for HCG quality factor is derived that agrees with spectral-fitting approaches reported in literature.
© 2011 Optical Society of America
Diffraction and Gratings
Original Manuscript: February 22, 2011
Manuscript Accepted: March 17, 2011
Published: April 29, 2011
Vadim Karagodsky, Christopher Chase, and Connie J. Chang-Hasnain, "Matrix Fabry–Perot resonance mechanism in high-contrast gratings," Opt. Lett. 36, 1704-1706 (2011)