We demonstrate that a photonic lattice with short- and long-range harmonic modulations of the refractive index facilitates formation of flat photonic bands and leads to slow propagation of light. The system can be considered a coupled-resonator optical waveguide (CROW): photonic bands with abnormally small dispersion are created due to the interaction of long-lived states in the cavity regions via weak coupling across tunneling barriers. Unlike previous CROW implementations, the proposed structures can be fabricated with interference photolithography (holography), sidestepping the issue of resonator-to-resonator fluctuation of the system parameters. The proposed holography-based approach enables fabrication of arrays with a large number of coupled optical resonators, which is necessary for practical applications.
© 2007 Optical Society of America
Original Manuscript: August 14, 2006
Revised Manuscript: November 6, 2006
Manuscript Accepted: November 8, 2006
Published: January 12, 2007
Alexey G. Yamilov and Massimo F. Bertino, "Disorder-immune coupled resonator optical waveguide," Opt. Lett. 32, 283-285 (2007)