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Matrix Fabry-Perot resonance mechanism in high-contrast gratings
Vadim Karagodsky1, Christopher Chase, Connie J Chang-Hasnain
1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
Optics Letters
|May 5, 2011
Abstract:
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.
